Unit converter
Hours to days.
Convert h to d and d to h. Type in either box and the other follows. Straight division by 24 — useful for battery life, shift patterns and delivery windows.
| h | d |
|---|---|
| 1 h | 0.0416667 d |
| 2 h | 0.0833333 d |
| 4 h | 0.166667 d |
| 6 h | 0.25 d |
| 8 h | 0.333333 d |
| 12 h | 0.5 d |
| 18 h | 0.75 d |
| 24 h | 1 d |
| 36 h | 1.5 d |
| 48 h | 2 d |
| 72 h | 3 d |
| 168 h | 7 d |
- Conversion goes through s in both directions, so neither figure is rounded on the way.
Definitions
- The hour is exactly 3600 seconds.
- The day here is exactly 86 400 seconds. Real solar days vary slightly, and leap seconds have occasionally made a calendar day 86 401 s long.
- This conversion is exact by definition. 1 h = 0.04166666667 d.
- Months and years are not fixed durations. The year here is the exact Julian year (365.25 days); the month is a mean Gregorian month, and a calendar month still varies from 28 to 31 days.
How it works
One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.
The value passes through s, the unit every other time unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general time converter always agree.
Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.
Common questions this answers: how many days in an hour (0.0416667), how many hours in a day (24), and what 36 h is in days (1.5 d).
- Free
- No ads
- No tracking
- No account
- Works offline once loaded
From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.