UnitConDays to Weeks Converter
Convert days to weeks for project planning, subscription periods, and elapsed time calculations. The 7-day week is universal in modern calendars, making this a straightforward conversion.
Formula
Divide days by 7 to get weeks. To reverse, multiply weeks by 7 to get days.
Quick reference
| Day (d) | Week (wk) |
|---|---|
| 7 | 1 |
| 14 | 2 |
| 21 | 3 |
| 28 | 4 |
| 30 | 4.285714 |
| 60 | 8.571429 |
| 90 | 12.85714 |
| 180 | 25.71429 |
| 365 | 52.14286 |
| 730 | 104.2857 |
About these units
Day
The 7-day week has ancient roots, referenced in Babylonian astronomy and Hebrew scripture. It was adopted by the Roman calendar during the 1st century CE and spread globally through Roman and Christian influence.
Week
The week is a cultural convention rather than an astronomical unit, but it is universally observed in modern civil and religious calendars. No SI unit equivalent exists for the week; it is simply 7 × 86,400 seconds.