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Year Converters

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

What this tool does

Convert years to and from months, weeks, days, hours, minutes, seconds, decades, and centuries. Type an amount in years (average Gregorian, 365.2425 days), choose the units, and the tool converts it to months (average Gregorian, 30.436875 days). It offers 12 time units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 12 options, including Second, Minute, Hour, Day, Week, Month (average Gregorian, 30.436875 days). Starts as Year (average Gregorian, 365.2425 days).
  • To: Choose one of the same 12 units as "From". Starts as Month (average Gregorian, 30.436875 days).

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 months (average Gregorian, 30.436875 days):

  • 1 yr = 12 mo
  • 5 yr = 60 mo
  • 10 yr = 120 mo
  • 50 yr = 600 mo
  • 100 yr = 1,200 mo

Multiply the number of years (average Gregorian, 365.2425 days) by 12 to get months (average Gregorian, 30.436875 days). Both units are exact definitions, so 12 is the exact factor: 1 yr = 12 mo.

Sources: Year (average Gregorian, 365.2425 days): exact by definition. Month (average Gregorian, 30.436875 days): exact by definition.

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 months are in one year?
A: One year is 12 months. Here both are Gregorian averages: a year of 365.2425 days and a month of 30.436875 days. Change the From and To boxes to convert any other pair of units.
Q: Can I convert the other way, from months to years?
A: Yes. Swap the From and To units. One month is 1/12 of a year, about 0.0833 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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