Years to Weeks Converter

About the yr to wk calculation

One year is exactly 52.1775 weeks, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The mean Gregorian year — 365.2425 days, which is why leap years exist. Seven days, or 604,800 seconds. The only common time unit with no astronomical basis.

Formula

wk = yr × 52.1775

1 yr = 52.1775 wk
1 wk = 0.019165 yr

Worked example

To convert 1 yr, multiply by 52.1775: 1 × 52.1775 = 52.1775 wk.

Frequently asked questions

How many weeks are in a year?

There are 52.1775 weeks in one year. To convert any amount, multiply the number of years by 52.1775.

How do I convert weeks back to years?

Divide instead of multiplying, or equivalently multiply by 0.019165. One week is 0.019165 years.

Is this conversion exact?

For seconds through weeks, yes — they are fixed multiples. The year is the mean Gregorian year of 365.2425 days, which is an average rather than the length of any particular calendar year.

Where is each of these units used?

Years: the mean Gregorian year — 365.2425 days, which is why leap years exist. Weeks: seven days, or 604,800 seconds. The only common time unit with no astronomical basis.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units