Instant · Precise · Universal
28 units available
6 categories total
To convert weeks to days: multiply by 7. To convert weeks to hours: multiply by 168.
1 wk = 7 d = 168 h = 10,080 min = 604,800 s. A year has about 52.18 weeks.
For example, 1 Week (wk) = 0.01916536532 Year (Tropical) (yr (Trop)).
| Week (wk) | Year (Tropical) (yr (Trop)) |
|---|---|
| 0.1 | 0.001916536532 |
| 0.5 | 0.009582682658 |
| 1 | 0.01916536532 |
| 2 | 0.03833073063 |
| 5 | 0.09582682658 |
| 10 | 0.1916536532 |
| 25 | 0.4791341329 |
| 50 | 0.9582682658 |
| 100 | 1.916536532 |
| 500 | 9.582682658 |
| 1000 | 19.16536532 |
The week is a unit of time equal to 7 days, or 604,800 seconds.
1 wk = 7 d = 168 h = 10,080 min = 604,800 s. A year has about 52.18 weeks.
To convert weeks to days: multiply by 7. To convert weeks to hours: multiply by 168.
Pay periods (biweekly), pregnancy tracking (40 weeks), sprint cycles in agile development, and workout schedules.
The seven-day week has no astronomical basis — unlike days, months, and years, it's a purely human invention. It has been continuous for thousands of years.
Assuming months are exactly 4 weeks — most months are 4.3 weeks (30–31 days). Only February in non-leap years is exactly 4 weeks.
Days of the week in many languages reflect the seven celestial bodies: Sun-day, Moon-day, Saturn-day, etc.
The tropical year is the time for the Sun to return to the same equinox point — approximately 365.24219 days (31,556,925.216 seconds).
1 tropical year ≈ 365.24219 days ≈ 365 d 5 h 48 min 45 s. Shorter than the sidereal year by about 20 minutes due to precession.
To convert tropical years to days: multiply by 365.24219. To Julian years: multiply by 365.24219/365.25.
Calendar design — the Gregorian calendar's average year (365.2425 days) approximates the tropical year to within 26 seconds.
The tropical year is slowly shortening — by about 0.53 seconds per century. In the year 1900, it was 365.24220 days.
Confusing tropical year with sidereal year — the tropical year is ~20 minutes shorter due to axial precession.
The tropical year governs seasons. If we used the sidereal year for calendars, seasons would slowly drift through the months over ~26,000 years.



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