To convert years to days, multiply by 365.25.
The calculation uses 1 yr = 365.25 d. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
Uses the Julian year of 365.25 days, not a particular calendar year.
The formula
value in d = value in yr × 365.25
yr- Input unit: years
d- Output unit: days
How to use this calculator
- Enter a value in yr.
- Multiply by the stored conversion factor.
- Read the result in d; divide by the same factor to convert back.
Worked examples
Worked conversion
1 yr × 365.25 ≈ 365.25 d.
Reverse conversion
365.25 d ÷ 365.25 ≈ 1 yr. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 365.25 d per yr. Uses the Julian year of 365.25 days, not a particular calendar year.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
yr to d table
| yr | d (rounded) |
|---|---|
| 0 | 0 |
| 1 | 365.25 |
| 2 | 730.5 |
| 5 | 1826.25 |
| 10 | 3652.5 |
| 100 | 36525 |
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