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Years Converter

Convert years to and from months, weeks, days, hours, and decades.

What this tool does

Convert years to and from months, weeks, days, hours, and decades. Type an amount in years (average Gregorian, 365.2425 days), choose the units, and the tool converts it to days. It offers 10 time units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 10 options, including Hour, Day, Week, Month (average Gregorian, 30.436875 days), Year (average Gregorian, 365.2425 days), Year (Julian, 365.25 days). Starts as Year (average Gregorian, 365.2425 days).
  • To: Choose one of the same 10 units as "From". Starts as Day.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from years (average Gregorian, 365.2425 days) to days:

  • 1 yr = 365.2425 d
  • 5 yr = 1,826.2125 d
  • 10 yr = 3,652.425 d
  • 50 yr = 18,262.125 d
  • 100 yr = 36,524.25 d

Multiply the number of years (average Gregorian, 365.2425 days) by 365.2425 to get days. Both units are exact definitions, so 365.2425 is the exact factor: 1 yr = 365.2425 d.

Sources: Year (average Gregorian, 365.2425 days): exact by definition. Day: SI Brochure, 9th edition (2019), Table 8.

Limitations

  • Converts a length of time between units. It does not work out the time between two calendar dates.
  • Months and years are averages, not the length of any particular calendar month or year.
  • Decades and centuries are counted in average Gregorian years of 365.2425 days.

FAQs

Q: How many days are in one year?
A: This page starts with the average Gregorian year, which is 365.2425 days. A common year is 365 days and a leap year is 366 days. Change the From and To boxes to convert any other pair of units.
Q: Can I convert the other way, from days to years?
A: Yes. Swap the From and To units. One day is about 0.002738 average Gregorian years.
Q: How long is a month or a year here?
A: A month is the average Gregorian month, 30.436875 days, and a year is the average Gregorian year, 365.2425 days (97 leap years in every 400 years). Real months and years vary in length, so these are averages.
Q: Why are there several kinds of year?
A: A common year is 365 days, a leap year is 366 days, a Julian year is 365.25 days and the average Gregorian year is 365.2425 days. The page starts with the average Gregorian year. Pick another in the From or To box if you need it.

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