Convert years to days
Converting years to days is a common time task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 yr equals 365.243 d, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert years to days
To convert years to days, multiply the number of years by 365.243. For example, 10 yr × 365.243 = 3,652.43 d.
d = yr × 365.243
- Write down the value in years you want to convert.
- Multiply it by 365.243 (the exact yr→d factor).
- The result is your value in days. Check it below with the converter or the table.
Conversion table
Common values of years and their equivalents in days:
| yr | d |
|---|---|
| 1 | 365.243 |
| 2 | 730.485 |
| 3 | 1,095.73 |
| 4 | 1,460.97 |
| 5 | 1,826.21 |
| 10 | 3,652.43 |
| 20 | 7,304.85 |
| 25 | 9,131.06 |
| 50 | 18,262.1 |
| 100 | 36,524.3 |
| 250 | 91,310.6 |
| 500 | 182,621 |
About these units
Year (yr). A year is the period of Earth's orbit around the Sun. This tool uses the Gregorian average of 365.2425 days, which matches the calendar over the 400-year leap cycle.
Day (d). A day equals 24 hours or 86,400 seconds, approximating one rotation of the Earth. Calendars, deadlines and project plans are built on days.
Frequently asked questions
How do I convert years to days?
To convert years to days, multiply the number of years by 365.243. For example, 10 yr × 365.243 = 3,652.43 d. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many days are in 1 year?
1 yr = 365.243 d. That is the fixed relationship used by this converter and by international standards.
How many years are in 1 day?
1 d = 0.00273791 yr. If you are converting in the opposite direction, use our Day to Year converter for the dedicated table and FAQ.
Is the years to days conversion exact?
Yes. Both units are defined by international agreement, so the factor of 365.243 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is year used for?
A year is the period of Earth's orbit around the Sun. This tool uses the Gregorian average of 365.2425 days, which matches the calendar over the 400-year leap cycle.