Divide hours by 24 to get days. Shipping estimates, battery life and fasting windows are often given in hours.
How to use the Hours to Days Converter
- Type the number of hours into the Hours field. Decimals such as 36 are fine.
- Read the answer in Days. It updates as you type, with no button to press. The same amount is also shown in week, min.
- To go from days back to hours, type into the Days field instead. Every field also has a unit menu with all 14 time units, for example s, ms, µs, ns, min, week, fortnight, month, year, decade.
Results update as you type, and everything is calculated in your browser.
How it works
Both units measure time, so they are always in the same ratio: one hour equals 0.041666667 days. The calculator multiplies the number of hours you type by 0.041666667 to give days, and when you type into the days field it divides by the same factor to give hours. Because the ratio never changes, doubling the hours always doubles the days, for example 144 h is 6 day.
How to convert hours to days
- Write down the value in hours, for example 72 h.
- Multiply by the conversion factor 0.041666667 (because 1 hour = 0.041666667 day).
- 72 × 0.041666667 = 3 day.
- To go back from days to hours, divide by 0.041666667, or multiply by 24.
h to day conversion table
| Hours | Days | Days | Hours |
|---|---|---|---|
| 1 h | 0.041666667 day | 1 day | 24 h |
| 6 h | 0.25 day | 2 day | 48 h |
| 12 h | 0.5 day | 5 day | 120 h |
| 24 h | 1 day | 10 day | 240 h |
| 36 h | 1.5 day | 20 day | 480 h |
| 48 h | 2 day | 50 day | 1,200 h |
| 72 h | 3 day | 100 day | 2,400 h |
| 96 h | 4 day | 1,000 day | 24,000 h |
| 100 h | 4.1666667 day | ||
| 120 h | 5 day | ||
| 168 h | 7 day | ||
| 1,000 h | 41.666667 day |
Time units explained
- Hour (h)
- An hour is 60 minutes or 3,600 seconds. Wages, shifts and travel times are counted in hours.
- Day (day)
- A day is 24 hours or 86,400 seconds. Calendar days occasionally differ by one second when a leap second is added.
Quick mental conversion
For a fast estimate, multiply hours by about 0.042 to get days; the error is about 0.8%. Use the calculator above when you need the exact figure.
Formula
1 h = 0.041666667 days
1 day = 24 h
day = h × 0.041666667
Worked example
Inputs: Hours: 72 h.
Results: Days = 3 day; Weeks = 0.42857143 week; Minutes = 4,320 min.
Frequently asked questions
How many days is 72 hours?
3 days.
How do I convert hours to days?
Multiply the number of hours by 0.041666667. For example, 72 h × 0.041666667 = 3 days.
How do I convert days back to hours?
Divide by 0.041666667 (or multiply by 24), or simply type the value into the days field above.
What is 100 h in days?
100 h = 4.1666667 days.
What is 1,000 h in days?
1,000 h = 41.666667 days.
Is the hours to days conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 day = 24 h exactly, so the only difference you may see is rounding in the last displayed digit.