What this tool does
Convert months to and from weeks, days, hours, years, decades, and other time units. Type an amount in months (average Gregorian, 30.436875 days), choose the units, and the tool converts it to days. It offers 7 time units and also shows the same amount in the others.
Inputs
- Value: A number.
- From: Choose one: Week, Day, Hour, Minute, Month (average Gregorian, 30.436875 days), Year (average Gregorian, 365.2425 days), Decade (10 average Gregorian years). Starts as Month (average Gregorian, 30.436875 days).
- To: Choose one of the same 7 units as "From". Starts as Day.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- 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 months (average Gregorian, 30.436875 days) to days:
- 1 mo = 30.436875 d
- 5 mo = 152.184375 d
- 10 mo = 304.36875 d
- 50 mo = 1,521.84375 d
- 100 mo = 3,043.6875 d
Multiply the number of months (average Gregorian, 30.436875 days) by 30.436875 to get days. Both units are exact definitions, so 30.436875 is the exact factor: 1 mo = 30.436875 d.
Sources: Month (average Gregorian, 30.436875 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 are counted in average Gregorian years of 365.2425 days.
FAQs
- Q: How many days are in one month?
- A: This page uses the average Gregorian month, which is 30.436875 days. Calendar months run from 28 to 31 days. Change the From and To boxes to convert any other pair of units.
- Q: Can I convert the other way, from days to months?
- A: Yes. Swap the From and To units. One day is about 0.03285 average months.
- 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.
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