Years to Months
Convert years to months instantly. 1 yr = 12 mo. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert years to months
To convert years to months, multiply by 12. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
mo = yr × 12
Years to Months conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Years | Months |
|---|---|
| 1 yr | 12 mo |
| 2 yr | 24 mo |
| 3 yr | 36 mo |
| 5 yr | 60 mo |
| 10 yr | 120 mo |
| 20 yr | 240 mo |
| 25 yr | 300 mo |
| 50 yr | 600 mo |
| 100 yr | 1,200 mo |
| 500 yr | 6,000 mo |
| 1,000 yr | 12,000 mo |
What is a year?
The mean Gregorian year of 365.2425 days.
What is a month?
One twelfth of a mean Gregorian year — about 30.44 days.
The formula
mo = yr × 12
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Years to Months
- Type the number of years you want to convert.
- Read the result in months straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked months to years page.
Years to Months — frequently asked questions
How many months are in a year?
One year equals 12 mo. mo = yr × 12
What is the formula to convert years to months?
The formula is mo = yr × 12. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert months back to years?
Divide instead of multiplying: one month is 0.0833333333 yr. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this years to months free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the years to months.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error