Weeks to Years Converter

About the wk to yr calculation

One week is exactly 0.019165 years, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Seven days, or 604,800 seconds. The only common time unit with no astronomical basis. The mean Gregorian year — 365.2425 days, which is why leap years exist.

Formula

yr = wk × 0.019165

1 wk = 0.019165 yr
1 yr = 52.1775 wk

Worked example

To convert 4 wk, multiply by 0.019165: 4 × 0.019165 = 0.076661 yr.

Frequently asked questions

How many years are in a week?

There are 0.019165 years in one week. To convert any amount, multiply the number of weeks by 0.019165.

How do I convert years back to weeks?

Divide instead of multiplying, or equivalently multiply by 52.1775. One year is 52.1775 weeks.

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?

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

Sources

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