Convert days to hours
Enter a value in days to convert it to hours.
days to hours reference
| days | hours |
|---|---|
| 1 d | 24 h |
| 2 d | 48 h |
| 5 d | 120 h |
| 10 d | 240 h |
| 25 d | 600 h |
| 50 d | 1200 h |
| 100 d | 2400 h |
The conversion factor
One day is 24 hours. So to convert, multiply your figure in days by 24. To go the other way, multiply hours by 0.04166667, or use the hours to days converter.
Doing it in your head
For a quick estimate, round the factor: roughly "times 24". Use the exact converter above when the number matters.
Where this conversion comes up
Durations in code and spreadsheets, timeouts, and project estimates.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many hours are in a day?
1 day = 24 hours.
What is the formula to convert days to hours?
Multiply the number of days by 24. To go back the other way, multiply hours by 0.04166667.
What is 10 days in hours?
10 days = 240 hours. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.