Days to Years Converter
1 day ≈ 0.00273790701 years
The calendar day is exactly 86,400 s here. Actual solar days vary by milliseconds, and leap seconds have occasionally been added to civil time.
A calendar year is 365 days, or 366 in a leap year. This converter uses the mean Gregorian year of 365.2425 days, which is the long-run average once leap years are included.
1 day equals 0.00273791 years
How to convert days to years
A day here is a duration of 86,400 seconds. Unless explicitly labeled Julian, months and years use the mean Gregorian convention (365.2425 days per year; one twelfth per month), rather than the actual length of a particular calendar interval.
yr = d × 0.002737907007One day is 0.002737907007 years, so a single multiplication converts any value.
0.0273791 yr ≈ 10 × 0.002737907007The calendar day is exactly 86,400 s here. Actual solar days vary by milliseconds, and leap seconds have occasionally been added to civil time.
A calendar year is 365 days, or 366 in a leap year. This converter uses the mean Gregorian year of 365.2425 days, which is the long-run average once leap years are included.
Days to years conversion table
Common values in days, converted to years.
| Days (d) | Years (yr) |
|---|---|
| 1 | 0.002737907 |
| 2 | 0.005475814 |
| 5 | 0.013689535 |
| 10 | 0.02737907 |
| 15 | 0.041068605 |
| 30 | 0.08213721 |
| 60 | 0.16427442 |
| 90 | 0.24641163 |
| 120 | 0.32854884 |
About these units
dayd
Exactly 24 hours, or 86,400 seconds.
yearyr
The mean Gregorian year: 365.2425 days.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.