# Feet and Inches Length Calculator

> Add, subtract, multiply, and divide feet and inches. Convert between imperial and metric length measurements.

**Category:** Math
**Keywords:** feet, inches, length, imperial, measurement, add, subtract, convert
**URL:** https://complete.tools/feet-inches-calculator

## How it calculates

Using basic arithmetic, the calculator efficiently manages lengths in feet and inches. For addition and subtraction, it works like this: Total Length = (Feet1 × 12 + Inches1) ± (Feet2 × 12 + Inches2). Here, 'Feet1' and 'Feet2' are your first and second measurements in feet, while 'Inches1' and 'Inches2' are the corresponding inches. When it comes to multiplication and division, the tool first converts everything into inches with: Length in Inches = (Feet × 12) + Inches. To switch to metric, it applies the conversion factor of 1 inch = 2.54 cm. So, to find out how many centimeters are in inches, you’d use: Total Length in cm = Total Length in Inches × 2.54.

## Who should use this

This tool is perfect for carpenters who need to measure and cut wood to exact lengths for their projects. Surveyors will find it invaluable for calculating land dimensions in both imperial and metric systems, ensuring accurate mapping. Architects can easily convert building dimensions from feet and inches to meters, keeping up with international standards. And tailors? They can adjust garment measurements between feet, inches, and metric units for custom fittings.

## Worked examples

Let’s say a carpenter is adding two lengths: 5 feet 6 inches and 3 feet 9 inches. First, convert everything to inches: 5 feet 6 inches equals (5 × 12) + 6, which is 66 inches. For 3 feet 9 inches, it’s (3 × 12) + 9, giving us 45 inches. Add those together, and you get 111 inches. Now, let’s convert back to feet and inches: 111 ÷ 12 equals 9 feet 3 inches.

In another scenario, a surveyor wants to convert 10 feet 4 inches into centimeters. Start by converting to inches: 10 feet 4 inches equals (10 × 12) + 4, which is 124 inches. Then, convert that to centimeters: 124 × 2.54 equals 315.76 cm. So, 10 feet 4 inches is about 315.76 cm.

## Limitations

While the calculator is handy, it does have its limits. It assumes you’re inputting whole numbers for both feet and inches, which means it won't handle fractional inches. Plus, metric conversions might be rounded, leading to slight inaccuracies. Extreme measurements can cause overflow errors in some systems. And remember, negative values aren’t accepted, which can come up in certain contexts, like measuring distances in opposite directions.

## FAQs

**Q:** How does the tool handle mixed-unit calculations? 

**A:** It converts all inputs into a single unit (inches) before doing any math to keep things consistent.


**Q:** What’s the maximum length the calculator can handle? 

**A:** It can manage lengths up to about 32,767 feet, thanks to the limits of a signed 16-bit integer.


**Q:** Does the calculator account for precision when converting to metric? 

**A:** Yes, it uses a conversion factor of 2.54 cm for each inch, but results might be rounded based on the tool's decimal precision settings.


**Q:** Can I input values in decimal format? 

**A:** This tool works best with whole numbers in feet and inches; decimal values won’t be processed correctly.

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