How it's calculated
years = days ÷ 365.25
days = number of days, years = years. Uses the 365.25-day average year (accounts for leap years); reverse: days = years × 365.25.
Common values
| Days | Years |
|---|---|
| 30 | 0.082 |
| 365 | 0.999 |
| 730 | 1.999 |
| 1,826 | 5.0 |
| 3,653 | 10.0 |
Common questions
Why 365.25 days per year?
It is the Julian average that spreads the extra leap-year day evenly across four years.
Is 365 days exactly one year here?
Almost. 365 days comes out to about 0.999 years because the average year is a quarter day longer.