Math Calculators

Browse 324 free math tools. All tools are free, instant, and require no signup.

Solve mathematical problems from basic arithmetic to advanced calculus. Calculate percentages, fractions, algebra equations, geometry formulas, statistics, and scientific notation with step-by-step explanations.

All Math Tools

• °C to °F - Convert Celsius to Fahrenheit instantly. Enter a temperature in degrees Celsius and read it in degrees Fahrenheit.
• °F to °C - Convert Fahrenheit to Celsius instantly. Enter a temperature in degrees Fahrenheit and read it in degrees Celsius.
• 30 60 90 Triangle Calculator - Calculate all sides and angles of a 30-60-90 special right triangle. Enter any side length to find the remaining measurements instantly.
• 45 45 90 Triangle Calculator - Calculate all sides and angles of a 45-45-90 special right triangle. Enter any side length to find the remaining measurements instantly.
• Acreage Calculator - Calculate land area in acres from dimensions in feet, meters, or other units
• Actual Lumber Dimensions - Convert common nominal lumber sizes (2x4, 4x4, etc.) to their actual finished dimensions instantly.
• Add Calculator - Add multiple numbers together quickly and easily. Simple addition calculator for any quantity of numbers.
• Adding Fractions Calculator - Add two fractions together instantly. Finds a common denominator, simplifies, and shows the result.
• Age Calculator - Find your exact age in years, months and days from a date of birth, plus total days and weeks lived and your next birthday.
• Age Difference - Find the exact time between two dates, such as two birthdays, in years, months and days, with the total number of days.
• Angle Between Two Vectors Calculator - Calculate the angle between two vectors using dot product and magnitude formulas
• Angle of Depression Calculator - Calculate angle of depression, distance, and height using trigonometry
• Angle of Elevation Calculator - Calculate angle of elevation, distance, and height using trigonometry
• Antilogarithm Calculator - Calculate the antilog (inverse logarithm) for base 10, base e, and custom bases
• Aquarium Tank Volume Calculator - Calculate aquarium water volume in gallons and liters from tank dimensions.
• Aquarium Tank Weight Calculator - Calculate total aquarium weight including water, substrate, and decorations.
• Arc Length Calculator - Calculate the arc length of a circle given the radius and central angle in degrees or radians.
• Arccos Calculator - Calculate the inverse cosine (arccosine) of a value and get results in degrees and radians
• Arcsine (Arcsin) Calculator - Calculate the inverse sine (arcsin) to find the angle from a sine value
• Arctan Calculator - Calculate the inverse tangent (arctangent) of a value and get results in degrees and radians
• Area Calculator - Find Area - Calculate the area of any shape including rectangles, triangles, circles, trapezoids, ellipses, and polygons.
• Area Calculator (Shapes) - Calculate the area of common geometric shapes including squares, circles, and triangles.
• Area of a Circle Calculator - Calculate the area, circumference, diameter, and radius of a circle with instant results.
• Average Calculator - Calculate the arithmetic mean of a set of numbers instantly.
• Average Rate of Change Calculator - Calculate the average rate of change between two points on a function or from a set of data values
• Barrel Volume and Capacity Calculator - Calculate the volume and capacity of cylindrical barrels. Determine how much liquid a barrel can hold based on its dimensions.
• Basic Calculator - Simple calculator for basic arithmetic operations: addition, subtraction, multiplication, and division
• Bathroom Tile Flooring Cost Guide - Estimate bathroom tile flooring costs based on room size, tile type, and labor rates
• Bathtub Installation Cost Guide - Estimate bathtub installation costs including materials, labor, and additional expenses for your bathroom renovation project
• Big Number Calculator - Perform arithmetic on very large numbers with arbitrary precision using BigInt
• Board & Batten Layout - Calculate board and batten counts and spacing for a wall run quickly.
• Board and Batten Siding Calculator - Calculate board and batten siding materials, coverage, and spacing for your project
• Board Foot Calculator - Calculate board feet of lumber from thickness, width, length and number of boards, for planning and buying.
• Brick Wall Calculator - Calculate bricks needed, mortar required, and construction costs for building a brick wall with precise measurements
• Built-in Cabinets Calculator - Calculate materials, dimensions, and costs for custom built-in cabinet projects including shelving, storage units, and wall installations.
• Cabinet Door Calculator - Compute door widths for multi-door cabinets given opening width and gap allowances.
• Cat Age Calculator - Convert your cat's age in years to the human-age equivalent using the common 15, 9 then 4 years-per-year rule of thumb.
• Circle Calculator - Calculate radius, diameter, circumference, and area from any single circle property
• Circle Converters - Convert between circle measurements: radius, diameter, circumference, and area
• Circumference Calculator - Calculate circle circumference from radius or diameter. Get all circle measurements instantly with this geometry calculator.
• Circumference to Diameter Calculator - Convert a circle's circumference to its diameter and radius, and work out its area, using diameter = circumference ÷ π.
• Clapboard and Lap Board Siding Calculator - Calculate the number of clapboard or lap board siding pieces needed for your project based on wall dimensions and board exposure.
• College GPA Calculator - Calculate your semester and cumulative GPA with weighted grades for college courses
• Common Factor Calculator - Find all common factors shared between two or more numbers with prime factorization
• Common Fraction and Percent Equivalents - Quick reference chart showing fraction to percent conversions and vice versa
• Common Fractions with Decimal Equivalents - Reference chart for fraction to decimal conversions with common fractions
• Comparing Fractions Calculator - Compare two fractions to see which is larger, smaller, or if they are equal, with the working shown over a common denominator.
• Completing the Square Calculator - Solve quadratic equations by completing the square with step-by-step process and vertex form conversion
• Complex Number Calculator - Perform arithmetic operations on complex numbers including addition, subtraction, multiplication, and division
• Concrete Driveway Calculator - Calculate the amount of concrete needed for a driveway project including cubic yards and estimated costs
• Cone Volume Calculator - Calculate the volume, surface area, and other properties of a cone given its radius and height.
• Container Loading Calculator - Estimate how many boxes fit in a shipping container or on a pallet with volume efficiency
• Convolution Calculator - Calculate the discrete convolution of two sequences or signals
• Cosecant Calculator - Calculate csc(x) for any angle in degrees or radians with step-by-step explanation
• Cosine (Cos) Calculator - Calculate the cosine of an angle in degrees or radians with visual representation
• Cosine Calculator - Calculate cos(x) for any angle in degrees or radians with unit circle visualization
• Cotangent Calculator - Calculate cot(x) for any angle in degrees or radians with detailed trigonometric relationships
• Coterminal Angle Calculator - Find positive and negative coterminal angles for any given angle in degrees or radians
• Cross Product Calculator - Calculate the cross product of two 3D vectors with step-by-step solution
• Cubic Feet Calculator - Calculate the volume of a box in cubic feet, with cubic inches, cubic yards, cubic meters and liters.
• Cubic Inches Calculator - Calculate the volume of a box in cubic inches, with cubic feet, cubic centimeters, liters and US gallons.
• Cubic Meters Calculator - Calculate cubic meters (m³) from dimensions with conversions to other volume units
• Cubic Yards Calculator - Work out the cubic yards of mulch, gravel, soil or concrete from length, width and depth, with cubic feet and cubic meters.
• Cylinder Cubic Footage Calculator - Calculate cubic feet volume of a cylinder using diameter and height measurements
• Cylinder Cubic Yardage Calculator - Calculate the cubic yard volume of a cylinder for estimating concrete, soil, or other materials.
• Days Until Calculator - Enter any date to see how many days are left until it, also shown as weeks and days, and the weekday it falls on.
• Decimal to Fraction Calculator - Convert a decimal number into a simplified fraction instantly. Perfect for math students and professionals.
• Decimal to Percent Calculator - Convert decimal numbers to percentages instantly. Simple decimal to percent conversion tool.
• Decimal to Ratio Calculator - Convert decimal numbers to simplified ratios in the form A:B
• Degree Converters - Convert between degrees, radians, gradians and turns for angular measurements.
• Degrees to Degrees, Minutes, Seconds Calculator - Convert decimal degrees to degrees, minutes, and seconds (DMS) format instantly.
• Degrees to Radians - Convert degrees to radians, and radians back to degrees, with gradians and turns shown alongside.
• Degrees, Minutes, Seconds to Decimal Calculator - Convert DMS (degrees, minutes, seconds) to decimal degrees format instantly.
• Density Calculator - Calculate density from mass and volume, or find mass/volume given density
• Derivative Calculator - Compute derivatives with step-by-step solutions using power, chain, product, and quotient rules
• Differential Equation Solver - Solve first-order and second-order ODEs (separable, linear, exact, Bernoulli) with step-by-step methods
• Distance Between Two Points Calculator - Calculate the distance between two points in 2D or 3D space using coordinate geometry
• Distance Calculator - Calculate the distance between two points in 2D or 3D space using the distance formula
• Dividing Fractions Calculator - Divide fractions by multiplying by the reciprocal with step-by-step solutions and simplification
• Division Calculator - Divide numbers quickly and easily. Simple division calculator showing quotient and remainder.
• Dog Age Calculator - Convert your dog's age to human years using the common size-based rule: 15 for year one, 9 for year two, then 4, 5 or 6 a year.
• Dog Calorie Calculator - Calculate daily calorie needs for your dog based on weight, activity level, and life stage
• Dog Pregnancy Calculator - Calculate your dog's due date and pregnancy milestones from breeding date
• Dog Water Intake Calculator - Calculate how much water your dog should drink daily based on weight and activity
• Dog Weight Calculator - Predict adult weight for puppies and check ideal weight ranges by breed
• Dot Product Calculator - Calculate the dot product of two vectors in 2D or 3D space
• Double Angle Calculator - Calculate trigonometric double angle formulas for sine, cosine, and tangent
• Doubling Time Calculator - Calculate how long it takes for a quantity to double given a growth rate
• Eigenvalue and Eigenvector Calculator - Compute eigenvalues, eigenvectors, and characteristic polynomial for square matrices
• Electric Charge Conversion - Convert between coulombs, ampere-hours, milliampere-hours, and other electric charge units instantly
• Electric Current Conversion - Convert between amperes, milliamperes, microamperes, and other electric current units instantly
• Electrical Conductance Conversion - Convert between siemens, millisiemens, microsiemens, and mho units for electrical conductance
• Electrical Inductance Conversion - Convert between henries, millihenries, microhenries, and nanohenries for electrical inductance.
• Electrical Resistance Conversion - Convert between ohms, kiloohms, megaohms, and milliohms for electrical resistance
• Elevation Grade Calculator - Calculate slope percentage, angle in degrees and slope length from an elevation rise and a horizontal run.
• Ellipse Calculator - Calculate area, perimeter, circumference, and eccentricity of an ellipse from semi-major and semi-minor axes
• End of School Countdown Calculator - Count the days, weeks and school days left until the last day of school, skipping any break days you list.
• Endpoint Calculator - Find the endpoint coordinates of a line segment given starting point and midpoint
• Equation of a Line Calculator - Calculate the equation of a line from two points or point-slope form in slope-intercept, point-slope, and standard forms
• Equilateral Triangle Calculator - Calculate the side length, height, area, and perimeter of an equilateral triangle from any known dimension
• Equivalent Fractions Calculator - Find equivalent fractions by multiplying or dividing the numerator and denominator by the same number
• Equivalent Fractions Chart - Visual chart displaying common equivalent fractions from 1/2 to 1/12 for easy reference and comparison
• Euclidean Algorithm Calculator - Find the greatest common divisor (GCD) of two numbers using the Euclidean algorithm with step-by-step solution
• Explain This Number - Turn large numbers into intuitive human comparisons with instant context and relatable explanations
• Exponent Calculator - Raise numbers to any power and calculate roots instantly.
• Exponential Decay Calculator - Calculate exponential decay with initial value, decay rate, and time. Find remaining amount, half-life, and decay constant.
• Exponential Growth Calculator - Calculate exponential growth with initial value, growth rate, and time. Find future value, doubling time, and growth constant.
• Factor Calculator - Find all factors and prime factorization of any positive integer
• Factorial Calculator - Calculate the factorial of any number (n!). Solve permutations, combinations, and probability problems.
• Feet and Inches Length Calculator - Add, subtract, multiply, and divide feet and inches. Convert between imperial and metric length measurements.
• Fibonacci Sequence Calculator - Generate Fibonacci numbers, find the nth term, or calculate the sequence up to a specific value
• Forty Converters - Convert the number 40 (or any number) to binary, hex, octal, Roman numerals, words, and more
• Fraction Calculator - Perform addition, subtraction, multiplication, and division of fractions with simplified results.
• Fraction Simplifier - Reduce fractions to their simplest form by finding the greatest common divisor
• Fraction to Decimal Calculator - Convert a fraction into its decimal equivalent instantly. Displays results rounded to various decimal places.
• Fraction to Percent Calculator - Convert any fraction to a percent and a decimal, and see it in lowest terms.
• Fraction to Ratio Calculator - Convert fractions to ratio notation and simplify to lowest terms
• Fractions Calculator - Add, subtract, multiply, and divide fractions. Supports mixed numbers and automatically simplifies results to lowest terms.
• GCD Calculator - Calculate the Greatest Common Divisor of two or more integers.
• GCF Calculator - Calculate the Greatest Common Factor (GCF/GCD) of two or more numbers using the Euclidean algorithm
• Golden Ratio Calculator - Calculate golden ratio proportions. Enter any value to find its golden ratio pair using phi (φ ≈ 1.618).
• GPA Calculator - Calculate your Grade Point Average (GPA) from letter grades and credit hours. Supports weighted and unweighted calculations.
• GPA to Letter Grade Calculator - Convert your GPA to its equivalent letter grade. See where your GPA falls on the A-F grading scale.
• Graph Plotter - Plot mathematical functions on an interactive coordinate plane with zoom and pan
• Greatest Common Factor Calculator - Find the Greatest Common Factor (GCF) of two or more numbers. Also shows all factors and step-by-step solution.
• Guide to the International System of Units (SI) - Comprehensive reference for SI units including the 7 base units, derived units, and SI prefixes with conversion helpers
• Half Angle Calculator - Calculate half angle trigonometric values using half angle formulas. Find sin(θ/2), cos(θ/2), and tan(θ/2).
• Heron's Formula Calculator - Find the area of a triangle from its three side lengths, with its perimeter and semi-perimeter, using Heron's formula.
• Hexagon Calculator - Calculate area, perimeter, and other properties of regular hexagons from side length, apothem, or area
• High School GPA Calculator - Calculate your high school GPA with weighted and unweighted options for honors and AP classes
• How Many Days Are Left In 2026? - Shows how many days remain until the end of 2026, counting from today or any date you choose.
• How Many Days Until April? - Count the days until the next April 1, from today or any date you choose.
• How Many Days Until August? - Count the days until the next August 1, from today or any date you choose.
• How Many Days Until Back to School? - Enter your school start date and see the days, weeks and days left until it begins.
• How Many Days Until Black Friday? - Count the days until the next Black Friday, the day after US Thanksgiving, from today or any date you choose.
• How Many Days Until Christmas Eve? - See how many days are left until the next Christmas Eve, December 24, counting from today or any date you choose.
• How Many Days Until Cyber Monday? - See how many days are left until the next Cyber Monday, the Monday after US Thanksgiving, counting from today or any date you choose.
• How Many Days Until December? - See how many days are left until the next December 1, counting from today or any date you choose.
• How Many Days Until Easter? - Find out how many days are left until the next Easter Sunday, Western or Orthodox, counting from today or any date you choose.
• How Many Days Until Father’s Day? - See how many days are left until the next Father’s Day, the third Sunday of June, counting from today or any date you choose.
• How Many Days Until February? - See how many days are left until the next February 1, counting from today or any date you choose.
• How Many Days Until January? - Count the days from today, or any date you choose, to the next January 1.
• How Many Days Until July? - Count the days from today, or any date you choose, to the next July 1.
• How Many Days Until June? - Count the days from today, or any date you choose, to the next June 1.
• How Many Days Until Labor Day? - Count the days from today, or any date you choose, to the next US Labor Day, the first Monday of September.
• How Many Days Until March? - Count the days from today, or any date you choose, to the next March 1.
• How Many Days Until May? - Count the days left until May 1, from today or any date you choose. After May 1 it counts to May 1 of the next year.
• How Many Days Until Memorial Day? - Count the days left until the next US Memorial Day, the last Monday of May, from today or any date you choose.
• How Many Days Until Mother’s Day? - Count the days left until the next US Mother’s Day, the second Sunday of May, from today or any date you choose.
• How Many Days Until November? - Count the days left until November 1, from today or any date you choose. After November 1 it counts to November 1 of the next year.
• How Many Days Until October? - Count the days left until October 1, from today or any date you choose. After October 1 it counts to October 1 of the next year.
• How Many Days Until September? - Count the days until the next September 1, with the weekday and full weeks.
• How Many Days Until Spring Break? - Enter your dates to see the countdown to Spring Break.
• How Many Days Until St. Patrick’s Day? - Count the days until the next St. Patrick’s Day, March 17, with the weekday and full weeks.
• How Many Days Until Valentine’s Day? - Count the days until the next Valentine’s Day, February 14, with the weekday and full weeks.
• How Many Weeks Are Left In 2026? - Shows how many weeks remain until the end of 2026, with a part week rounded up.
• How to Add Feet and Inch Fractions - Add, subtract, multiply, and divide measurements in feet, inches, and fractions with step-by-step explanations
• How to Calculate Linear Feet - Calculate linear feet for lumber, trim, fencing, and other materials with conversion from inches and other units
• How to Measure a Room - Interactive guide and calculator for measuring room dimensions, calculating area, and estimating materials
• How to Read a Ruler - Interactive guide to reading rulers and tape measures with inch fractions, metric scales, and practice exercises
• How to Read a Tape Measure - Learn to read tape measure markings, fractions, and convert between imperial and metric measurements
• How to Use a Protractor - Learn to measure and draw angles using a protractor with interactive examples and practice
• Hypotenuse Calculator - Calculate the hypotenuse of a right triangle using the Pythagorean theorem
• Improper Fraction to Mixed Number Calculator - Convert improper fractions to mixed numbers with step-by-step explanation
• Inch – Unit of Measurement Definition - Learn about the inch unit including history, conversions, and practical applications
• Inch Fraction Calculator - Add, subtract, multiply, and divide inch fractions with decimal conversion
• Integral Calculator - Solve definite and indefinite integrals with step-by-step solutions including u-sub and integration by parts
• Interactive Graphing Calculator - Full-featured function grapher with zoom, pan, sliders, multiple functions, and intersection finding
• Inverse Cosine Calculator – Calculate arccos(x) - Calculate the inverse cosine (arccos) of a value in degrees or radians
• Inverse Sine Calculator – Calculate arcsin(x) - Calculate the inverse sine (arcsin) of a value in degrees or radians
• Inverse Tangent Calculator – Calculate arctan(x) - Calculate the inverse tangent (arctan) of a value in degrees or radians
• Isosceles Triangle Calculator - Calculate area, perimeter, height, and angles of an isosceles triangle from base and leg lengths
• KD Ratio Goal Calculator - Calculate how many consecutive kills needed to reach a target kill/death ratio
• Law of Cosines Calculator - Solve triangles using the law of cosines: c² = a² + b² - 2ab·cos(C)
• Law of Sines Calculator - Solve triangles using the law of sines: a/sin(A) = b/sin(B) = c/sin(C)
• Lawn Mowing Calculator - Calculate time needed to mow your lawn based on lawn size and mower specifications
• LCM Calculator - Calculate the Least Common Multiple of two or more integers.
• Least Common Denominator Calculator - Find the least common denominator (LCD) of two or more fractions
• Least Common Multiple Calculator - Calculate the least common multiple (LCM) of two or more numbers
• Letter Grade to GPA Calculator - Convert letter grades (A, B, C, D, F) to GPA points
• Limit Calculator - Evaluate limits including one-sided limits, limits at infinity, and L'Hopital's rule with steps
• Log Calculator (Any Base) - Calculate logarithms with any base including common log (base 10) and custom bases
• Logarithm Calculator - Calculate logarithms for any base including natural (ln) and common (log10) logs.
• Long Division Calculator - Perform long division instantly. Shows quotient, remainder, and decimal result.
• Marks Percentage Calculator - Calculate percentage from marks obtained and total marks for exams and tests
• Matrix Calculator - Perform basic matrix operations including addition, subtraction, and 2x2 determinant calculation.
• Matrix RREF Calculator - Reduce matrices to row echelon and reduced row echelon form with step-by-step row operations
• Mean, Median, Mode, Range Calculator - Calculate mean, median, mode, and range from a set of numbers. Essential statistics calculator for data analysis.
• Metal Weight Calculator - Calculate the weight of metal shapes including steel, aluminum, copper, and brass
• Midpoint Calculator - Calculate the midpoint between two points in 2D or 3D coordinate space
• Milk Weight Calculator - Convert between milk volume and weight for cooking and dairy applications
• Minecraft Portal Coordinate Calculator - Convert Overworld coordinates to Nether coordinates for perfect portal linking
• Minutes to Seconds Converter - Convert minutes to seconds instantly. Enter a number of minutes and see the same time in seconds.
• Mixed Number Calculator - Add, subtract, multiply, and divide mixed numbers and fractions
• Mixed Number to Improper Fraction Calculator - Convert mixed numbers to improper fractions with step-by-step explanation
• Multiplication Calculator - Multiply numbers quickly and easily. Simple multiplication calculator for finding products of numbers.
• Multiplying Fractions Calculator - Calculate the product of two or more fractions with step-by-step solutions and automatic simplification
• Natural Logarithm Calculator - Calculate the natural logarithm (ln) of any positive number with base e ≈ 2.71828
• Number Contextualizer - Make large numbers relatable by comparing them to familiar objects like football fields, blue whales, and more
• Number Sequence Generator - Generate lists of numbers with custom start, end, and step values.
• Number to Words - Write a number out in English words, such as 1234 as one thousand two hundred thirty-four.
• Octagon Calculator - Calculate the area, perimeter, and other properties of a regular octagon from its side length.
• Order of Operations Calculator - Evaluate math expressions step-by-step following PEMDAS/BODMAS rules
• Parallelogram Area Calculator - Calculate the area of a parallelogram using base and height or sides and angle
• Partial Fraction Decomposition Calculator - Decompose rational expressions into partial fractions with step-by-step work for calculus and algebra
• Pentagon Calculator - Calculate area, perimeter, and other properties of a regular pentagon from side length
• Percent Error Calculator - Measure the accuracy of your experimental values against theoretical results.
• Percent of a Percent Calculator - Calculate one percent of another percent, such as 50% of 80%, shown as a percent and as a decimal.
• Percent to Decimal Calculator - Convert percentages to decimal numbers instantly by dividing by 100.
• Percent to Fraction Calculator - Convert percentages to fractions in simplest form.
• Percent to Ratio Calculator - Convert percentages to ratios (e.g., 25% to 1:3)
• Percent to Total Calculator - Find the total when you know a part and what percentage it represents.
• Percentage Calculator - Calculate percentages of values, percentage relationships, and percentage changes instantly.
• Percentage Change Calculator - Calculate the percentage increase or decrease from an old value to a new value, with the absolute change and your choice of decimal places.
• Percentage Decrease - Calculate the percentage decrease between two values instantly.
• Percentage Difference - Calculate the percentage difference between two positive numbers.
• Percentage Increase - Calculate the percentage increase between two values instantly.
• Percentage Increase Calculator - Calculate the percentage increase between two values or find the new value after a percentage increase
• Percentage Pro - Calculate percentage changes, increases, decreases, and standard mathematical relationships instantly.
• Perimeter Calculator - Calculate the perimeter of rectangles, squares, triangles, circles, and other shapes
• Permutation and Combination Calculator - Calculate permutations (nPr) and combinations (nCr) together. Find how many ways to arrange or choose items.
• Permutations & Combinations - Solve complex arrangement and selection problems with nPr and nCr calculations.
• Plant and Flower Calculator - Calculate plant spacing, quantity needed, and coverage for garden beds and landscaping
• Plywood Thickness & Size - Lookup common nominal plywood thicknesses and their actual finished sizes.
• Plywood Weight Calculator - Estimate the weight of a plywood sheet given dimensions, thickness, and material density.
• Point-Slope Form Calculator - Calculate and convert linear equations between point-slope, slope-intercept, and standard form
• Polygon Calculator - Calculate area, perimeter, and angles of regular polygons with 3 to 100 sides
• Polynomial Root Finder - Find all real and complex roots of polynomials up to degree n using synthetic division and rational root theorem
• Pool Volume Calculator - Calculate swimming pool water volume in gallons and liters for rectangular, circular, and oval pools
• Prime Factorization Calculator - Find the prime factors of any positive integer and express it as a product of prime numbers
• Prime Number Checker - Instantly check if a number is prime and discover its divisors.
• Pythagorean Triangle Solver - Calculate the missing side of a right triangle using the Pythagorean theorem (a² + b² = c²)
• Quadratic Equation Solver - Solve quadratic equations of the form ax² + bx + c = 0 instantly.
• Quadratic Roots Calculator - Solve quadratic equations (ax² + bx + c = 0) using the quadratic formula with step-by-step solutions
• Radius Calculator - Calculate the radius of a circle from diameter, circumference, or area with instant results and all related circle measurements
• Random Number Generator - Generate random numbers within a specified range. Perfect for games, decision making, statistics, and simulations.
• Ratio Calculator - Solve proportions and scale ratios instantly.
• Ratio Simplifier - Simplify ratios to their lowest terms by finding the greatest common divisor.
• Ratio to Decimal Calculator - Convert ratios in the form A:B to their decimal equivalent.
• Ratio to Fraction Calculator - Convert ratios in the form A:B to simplified fractions.
• Ratio to Percentage Calculator - Convert a ratio A:B to the percentage that A makes up of the total of A and B.
• Rhombus Calculator - Calculate area, perimeter, and diagonals of a rhombus
• Rise Over Run to Degrees Calculator - Convert slope expressed as rise over run to angle in degrees, radians, and percent grade
• Rise Over Run to Percent Slope Calculator - Convert rise over run ratios to percent slope, degrees, and simplified ratios for construction, roofing, and accessibility projects
• Roman Numeral Converter - Convert whole numbers from 1 to 3,999 to Roman numerals and Roman numerals back to numbers.
• Root Calculator - Calculate square roots, cube roots, and nth roots of any number
• Rounding Calculator - Round numbers to specified decimal places or nearest whole numbers.
• Ruler Information, Uses, and Types - Comprehensive guide to ruler types, measurement conversions, and inch fraction references for construction, drafting, and everyday use
• Scale Conversion Calculator - Convert between scale drawings and actual measurements for architectural plans, maps, and models
• Scientific Calculator - Advanced calculator with exponents, square roots, logarithms, and trigonometric functions. Supports keyboard and button input.
• Scientific Notation Converter - Convert standard numbers to scientific notation (E-notation) and back instantly.
• Seconds to Hours Converter - Convert seconds to hours quickly and accurately. Enter a number of seconds and see the same time in hours.
• Seconds to Minutes Converter - Convert seconds to minutes instantly. Enter a number of seconds and see the same time in minutes.
• Sector Area Calculator - Calculate the area, arc length, and perimeter of a circular sector from its radius and central angle
• Series Convergence Calculator - Test infinite series for convergence using ratio, root, comparison, integral, and alternating series tests
• Significant Figures Calculator - Count and round numbers to the correct number of significant figures for scientific accuracy.
• Simple Calculator - Basic arithmetic calculator for addition, subtraction, multiplication, and division
• Simplifying Fractions Calculator - Reduce fractions to their simplest form by finding the greatest common divisor. Convert improper fractions to mixed numbers.
• Sine (Sin) Calculator - Calculate the sine of an angle in degrees or radians with visual representation
• Square Inches Calculator - Calculate area in square inches for rectangles, circles, triangles with unit conversions and real-world comparisons
• Square Kilometers to Square Miles Converter - Convert square kilometers (km²) to square miles (mi²). Area unit conversion for land measurement.
• Square Miles to Square Kilometers Converter - Convert square miles (mi²) to square kilometers (km²). Area unit conversion for land measurement.
• Square Root Calculator - Find the square root, cube root, or any n-th root of a number instantly.
• Subtraction Calculator - Subtract numbers quickly and easily. Simple subtraction calculator for finding differences between numbers.
• System of Equations Solver - Solve 2x2 and 3x3 systems of linear equations using substitution, elimination, and matrix methods
• Tangent (Tan) Calculator - Calculate the tangent of an angle in degrees or radians with visual representation
• Temperature Conversion - Convert temperatures between Celsius, Fahrenheit, and Kelvin with instant results.
• Test Grade Calculator - Calculate test scores, grades, and percentages with visual breakdowns
• Time Conversion - Convert between hours, minutes, seconds and total seconds quickly.
• Time Until Calculator - See the live countdown in days, hours, minutes, and seconds to any date and time you pick.
• Tire Size Calculator - Calculate sidewall height, total diameter, and circumference of any tire size.
• Tire Size Comparison Calculator - Compare two tire sizes side by side, including diameter change, revs per mile, and speedometer error.
• Tire Size Conversion - Convert common tire size formats and see overall diameter, circumference, and revolutions per mile.
• Triangle Area Calculator - Calculate triangle area using base-height, Heron's formula, SAS method, or equilateral triangle formulas
• Truth Table Generator - Generate truth tables for logical expressions (AND, OR, NOT, XOR, implication, biconditional)
• Unit Rate Calculator - Compare prices and find the best value per unit
• Vector Norm Calculator - Calculate L¹, L², L∞, and Lᵖ norms for vectors with visual comparisons and detailed analysis
• Vector Subtraction Calculator - Calculate and visualize vector subtraction in 2D and 3D space
• Vertex Form Calculator - Convert quadratic equations to vertex form and visualize parabolas
• Water Weight Calculator - Calculate water weight from volume, dimensions, or body composition with visual breakdowns
• Weighted Average - Calculate the average of values with different weights or importance.
• What Day Of The Year Is It? - Shows the day number within the year (1 to 365 or 366) for today or any date you pick.
• What Is the Date 10 Weeks From Today? - Find the exact date 10 weeks from today, or from any start date you choose.
• What Is the Date 12 Months From Today? - Find the exact date 12 months from today, or from any start date you choose.
• What Is the Date 12 Weeks From Today? - Find the exact date 12 weeks from today, or from any start date you choose.
• What Is the Date 120 Days From Today? - Find the exact date 120 days from today, or from any start date you choose.
• What Is the Date 14 Days From Today? - Find the exact date 14 days from today, or from any start date you choose.
• What Is the Date 16 Weeks From Today? - Find the exact date 16 weeks from today, or from any start date you choose.
• What Is the Date 18 Months From Today? - Find the exact date 18 months from today, or from any start date you choose.
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• What Is the Date 52 Weeks From Today? - Find the exact date 52 weeks from today, or from any start date you choose.
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• What Is the Date 6 Weeks From Today? - Find the exact date 6 weeks (42 days) from today, or from any start date you choose.
• What Is the Date 60 Days From Today? - Find the exact date 60 days from today, or from any start date you choose.
• What Is the Date 8 Weeks From Today? - Find the exact date 8 weeks (56 days) from today, or from any start date you choose.
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• What Is the Date 90 Days From Today? - Find the exact date 90 days from today, or from any start date you choose.
• What Is Todays Date? - Shows today's date, or any date you pick, as the weekday, week number, day of the year and in common written forms.
• What Time Is It 1 Hour From Now? - See the time 1 hour from now and copy it quickly.
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• What Time Is It 45 Minutes From Now? - Type the time now and see what the clock will read 45 minutes later.
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• What Time Is It 5 Minutes From Now? - Type the time now and see what the clock will read 5 minutes later.
• What Time Is It 72 Hours From Now? - See the time 72 hours from now and copy it quickly.
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• What Week Of The Year Is It? - Pick a date to see its week number in the year (ISO 8601), plus the day of the year.
• Wheel Offset Calculator - Convert between wheel offset and backspacing and visualize how offset changes wheel position.
• X and Y Intercept Calculator - Calculate and visualize x-intercept and y-intercept for linear equations