Convert Years to Days
1 year is 365.2425 d. One year is exactly 365.2425 days.
One year is 365.2425 days. To convert years to days, multiply by 365.2425; to go the other way, divide by 365.2425 or multiply by 0.002737907. This one is an average rather than an exact factor: a calendar year is 365 days or 366, so this figure is an average across the 400-year leap cycle. The definition comes from BIPM SI Brochure. The average Gregorian year, 365.2425 days — the figure the leap-year rule exists to produce.
Factor checked against the defining standard · How we check
- Years × 365.2425
value * 365.2425365.243 d
1 year in every time unit
| Unit | Value | Exact factor |
|---|---|---|
| seconds | 31,556,952 s | × 31,556,952 |
| minutes | 525,949.2 min | × 525,949.2 |
| hours | 8,765.82 h | × 8,765.82 |
| days | 365.2425 d | × 365.2425 |
| weeks | 52.1775 wk | × 52.1775 |
| months | 12 mo | × 12 |
| years (as entered) | 1 yr | — |
Factors are entered by hand from BIPM SI Brochure rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert years to days?
- 1.Take the measurement in years.
- 2.Multiply by 365.2425 — that is how many days fit in one year.
- 3.To go back the other way, divide by 365.2425, or multiply by 0.002737907.
Years to days conversion table
| Years | Days |
|---|---|
| 1 yr | 365.2425 d |
| 2 yr | 730.485 d |
| 3 yr | 1,095.7275 d |
| 4 yr | 1,460.97 d |
| 5 yr | 1,826.2125 d |
| 6 yr | 2,191.455 d |
| 7 yr | 2,556.6975 d |
| 8 yr | 2,921.94 d |
| 9 yr | 3,287.1825 d |
| 10 yr | 3,652.425 d |
| 12 yr | 4,382.91 d |
| 15 yr | 5,478.6375 d |
| 20 yr | 7,304.85 d |
| 25 yr | 9,131.0625 d |
| 50 yr | 18,262.125 d |
| 100 yr | 36,524.25 d |
What are years and days?
- Year (yr)
- The average Gregorian year, 365.2425 days — the figure the leap-year rule exists to produce.
- Day (d)
- Exactly 86,400 seconds by convention. A solar day runs a few milliseconds long or short, which is what a leap second corrects.
Source: BIPM SI Brochure — the second, and units accepted for use with the SI
Questions people actually ask
- How many days are in a year?
- 365.2425. Exactly 86,400 seconds by convention. A solar day runs a few milliseconds long or short, which is what a leap second corrects.
- How do I convert days back to years?
- Divide by 365.2425, or multiply by 0.002737907 — they are the same operation.
Other time conversions
Days to years — the same conversion the other way.