Day to Hour
1 d = 24 h
How to convert day to hour
Enter the value in day (d) above and the equivalent in hour (h) updates as you type. This conversion comes up when estimating project durations across work days, weeks, and person-hours.
- A full work day: 8 hours, 480 minutes → that is 0.333333 d in day.
Typical situations: reading timeouts or latency figures in technical documentation; comparing travel times quoted in hours and minutes.
You can also convert in the other direction: Hour to Day
Day to Hour conversion table
| Day (d) | Hour (h) |
|---|---|
| 1 | 24 |
| 2 | 48 |
| 5 | 120 |
| 10 | 240 |
| 25 | 600 |
| 50 | 1200 |
| 100 | 2400 |
Watch out for
- A "work week" is 40 hours, but a calendar week is 168 hours; never mix them in estimates
- Leap years: 365.25 days per year on average, which is why the 2026 date math drifts without them
Frequently asked questions
How many hours is 1 day?
1 day = 24 hours.
What is the formula to convert day to hours?
The formula is: h = d × 24.
What is 10 days in hours?
10 days = 240 hours.