Convert Days to Weeks
Convert Days (d) to Weeks (wk) instantly and accurately.
Conversion Formula
wk = d × 0.1428571429
About Days
A day (d) = exactly 86,400 s. Earth's actual solar day varies ±16 s due to orbital eccentricity and axial tilt (equation of time). Leap seconds (abandoned in UTC after 2035) corrected the TAI-UT1 divergence. Mars's sol = 24 h 39 min 35 s ≈ 88,775 s; a Martian year = 668.6 sols. The day structures circadian biology, tides, and planetary science. 1 day = 86,400 s = 24 h.
About Weeks
A week (wk) = exactly 7 days = 604,800 s. The 7-day week derives from Babylonian astronomy assigning one of the seven classical celestial bodies to each day - preserved in English (Sun-day, Mon-day, Satur-day) and Romance language day names. It spread globally via Jewish, Christian, and Islamic calendars. ISO 8601 numbers weeks 1-52(53) with Monday as day 1. 365-day years contain 52 weeks + 1 day. 1 wk = 7 d = 604,800 s.
Quick Reference Table
| Days (d) | Weeks (wk) |
|---|---|
| 1 d | 0.142857 wk |
| 2 d | 0.285714 wk |
| 5 d | 0.714286 wk |
| 10 d | 1.42857 wk |
| 25 d | 3.57143 wk |
| 50 d | 7.14286 wk |
| 100 d | 14.2857 wk |