Convert days to hours
Converting days to hours is a common time task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 d equals 24 h, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert days to hours
To convert days to hours, multiply the number of days by 24. For example, 10 d × 24 = 240 h.
h = d × 24
- Write down the value in days you want to convert.
- Multiply it by 24 (the exact d→h factor).
- The result is your value in hours. Check it below with the converter or the table.
Conversion table
Common values of days and their equivalents in hours:
| d | h |
|---|---|
| 1 | 24 |
| 2 | 48 |
| 3 | 72 |
| 4 | 96 |
| 5 | 120 |
| 10 | 240 |
| 20 | 480 |
| 25 | 600 |
| 50 | 1,200 |
| 100 | 2,400 |
| 250 | 6,000 |
| 500 | 12,000 |
About these units
Day (d). A day equals 24 hours or 86,400 seconds, approximating one rotation of the Earth. Calendars, deadlines and project plans are built on days.
Hour (h). An hour equals 60 minutes or 3,600 seconds, dividing the day into 24 parts. Work schedules, travel times and billing are commonly expressed in hours.
Frequently asked questions
How do I convert days to hours?
To convert days to hours, multiply the number of days by 24. For example, 10 d × 24 = 240 h. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many hours are in 1 day?
1 d = 24 h. That is the fixed relationship used by this converter and by international standards.
How many days are in 1 hour?
1 h = 0.0416667 d. If you are converting in the opposite direction, use our Hour to Day converter for the dedicated table and FAQ.
Is the days to hours conversion exact?
Yes. Both units are defined by international agreement, so the factor of 24 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is day used for?
A day equals 24 hours or 86,400 seconds, approximating one rotation of the Earth. Calendars, deadlines and project plans are built on days.