Days to hours – and hours to days
1 d = 24 h
All units in this category
- 86,400,000ms
- 86,400s
- 1,440min
- 24h
- 1d
- 0.14285714wk
- 0.032854884mth
- 0.002737907yr
Formula
Multiply the value in days by 24 to get hours.h = d × 24
Multiply the value in hours by 0.041666667 to get days.d = h × 0.041666667
How to convert days to hours
Type a value in the field above and the result is calculated instantly. Use the arrow button to swap direction, or pick other units from the lists.
Days to hours – common values
| Days (d) | Hours (h) |
|---|---|
| 1 | 24 |
| 2 | 48 |
| 3 | 72 |
| 5 | 120 |
| 10 | 240 |
| 12 | 288 |
| 24 | 576 |
| 30 | 720 |
| 60 | 1,440 |
| 100 | 2,400 |
Hours to days – common values
| Hours (h) | Days (d) |
|---|---|
| 1 | 0.0416667 |
| 2 | 0.0833333 |
| 3 | 0.125 |
| 5 | 0.208333 |
| 10 | 0.416667 |
| 12 | 0.5 |
| 24 | 1 |
| 30 | 1.25 |
| 60 | 2.5 |
| 100 | 4.16667 |
About the units
Days. A day is 24 hours, exactly 86,400 seconds – a number that recurs throughout programming. The unit is not an SI unit but is one of the long-standing units of time in the SI Brochure and is legal in the EU. The unit day is exact; the solar day is not, because the earth’s rotation varies. UTC has so far been held within nine tenths of a second of rotation time by leap seconds, and the General Conference on Weights and Measures decided in 2022 that the limit will be raised by 2035 at the latest.
Hours. An hour is 60 minutes, 3,600 seconds. Like the minute it is not an SI unit but is one of the long-standing units of time in the SI Brochure, and the EU units directive treats it as a legal unit. Since combinations of legal units are legal in turn, the kilometre per hour and the kilowatt-hour follow directly: a kilowatt-hour is exactly 3.6 megajoules because the hour is exactly 3,600 seconds. The symbol is h, lower case and without a full stop. At the daylight-saving change a local day has 23 or 25 hours.