About the wk to d calculation
One week is exactly 7 days, 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. Twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.
Formula
d = wk × 7
1 wk = 7 d
1 d = 0.142857 wkWorked example
To convert 4 wk, multiply by 7: 4 × 7 = 28 d.
Frequently asked questions
How many days are in a week?
There are 7 days in one week. To convert any amount, multiply the number of weeks by 7.
How do I convert days back to weeks?
Divide instead of multiplying, or equivalently multiply by 0.142857. One day is 0.142857 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. Days: twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units