Convert years to days
Enter a value in years to convert it to days.
years to days reference
| years | days |
|---|---|
| 1 yr | 365.25 d |
| 2 yr | 730.5 d |
| 5 yr | 1826.25 d |
| 10 yr | 3652.5 d |
| 25 yr | 9131.25 d |
| 50 yr | 18262.5 d |
| 100 yr | 36525 d |
The conversion factor
One year is 365.25 days. So to convert, multiply your figure in years by 365.25. To go the other way, multiply days by 0.00273785, or use the days to years converter.
Doing it in your head
For a quick estimate, round the factor: roughly "times 365". Use the exact converter above when the number matters.
Where this conversion comes up
Durations in code and spreadsheets, timeouts, and project estimates.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many days are in a year?
1 year = 365.25 days.
What is the formula to convert years to days?
Multiply the number of years by 365.25. To go back the other way, multiply days by 0.00273785.
What is 10 years in days?
10 years = 3652.5 days. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.