Years to days – and days to years
1 yr = 365.2425 d
All units in this category
- 31,556,952,000ms
- 31,556,952s
- 525,949.2min
- 8,765.82h
- 365.2425d
- 52.1775wk
- 12mth
- 1yr
Formula
Multiply the value in years by 365.2425 to get days.d = yr × 365.2425
Multiply the value in days by 0.002737907 to get years.yr = d × 0.002737907
How to convert years to days
Type a value in the field above and the result is calculated instantly. Use the arrow button to swap direction, or pick other units from the lists.
Years to days – common values
| Years (yr) | Days (d) |
|---|---|
| 1 | 365.243 |
| 2 | 730.485 |
| 3 | 1,095.73 |
| 5 | 1,826.21 |
| 10 | 3,652.43 |
| 12 | 4,382.91 |
| 24 | 8,765.82 |
| 30 | 10,957.3 |
| 60 | 21,914.6 |
| 100 | 36,524.3 |
Days to years – common values
| Days (d) | Years (yr) |
|---|---|
| 10 | 0.0273791 |
| 20 | 0.0547581 |
| 30 | 0.0821372 |
| 50 | 0.136895 |
| 100 | 0.273791 |
| 120 | 0.328549 |
| 240 | 0.657098 |
| 300 | 0.821372 |
| 600 | 1.64274 |
| 1,000 | 2.73791 |
About the units
Years. A year here is the mean Gregorian year: 365.2425 days, exactly 31,556,952 seconds. The figure follows from the leap-year rule, which gives 97 leap days in 400 years. The year is neither an SI unit nor a legal unit of measurement in the EU, but it is used in contracts, interest and energy consumption – the EU energy label states a fridge’s consumption in kilowatt-hours per year. The trap is that “a year” means several things: the Julian year is 365.25 days, and interest often counts 360 days.
Days. A day is 24 hours, exactly 86,400 seconds – a number that recurs throughout programming. The unit is not an SI unit but is one of the long-standing units of time in the SI Brochure and is legal in the EU. The unit day is exact; the solar day is not, because the earth’s rotation varies. UTC has so far been held within nine tenths of a second of rotation time by leap seconds, and the General Conference on Weights and Measures decided in 2022 that the limit will be raised by 2035 at the latest.