Days to Weeks Converter

About the d to wk calculation

One day is exactly 0.142857 weeks, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun. Seven days, or 604,800 seconds. The only common time unit with no astronomical basis.

Formula

wk = d × 0.142857

1 d = 0.142857 wk
1 wk = 7 d

Worked example

To convert 30 d, multiply by 0.142857: 30 × 0.142857 = 4.2857 wk.

Frequently asked questions

How many weeks are in a day?

There are 0.142857 weeks in one day. To convert any amount, multiply the number of days by 0.142857.

How do I convert weeks back to days?

Divide instead of multiplying, or equivalently multiply by 7. One week is 7 days.

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?

Days: twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun. 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