How many days are in a year?

1 year = 365.25 day. To convert any amount, multiply by 365.25.

How do you convert years to days?

Multiply the number of years by 365.25 to get days. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Time

Years to days converter

Convert years (year) to days (day). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert years to days— the formula

Years convert to days by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

day = year × 365.25

year = day × 0.002738

Second: SI base unit (BIPM). Days, weeks: exact. Month = 30.4375 days (year/12). Year = 365.25 days (Julian year, used in astronomy).

Questions

Frequently asked questions

How many days are in a year?
1 year = 365.25 day. To convert any amount, multiply by 365.25.
How do you convert years to days?
Multiply the number of years by 365.25 to get days. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.