Day to Hour Converter
One Day equals 24 Hour (1 d = 24 h). Multiply a Day value by 24 to get the equivalent in Hour. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
h = d × 24
Multiply the Day value by 24 to get the equivalent value in Hour.
Example Conversions
1 Day (d)
24 Hour (h)
5 Day (d)
120 Hour (h)
10 Day (d)
240 Hour (h)
25 Day (d)
600 Hour (h)
100 Day (d)
2400 Hour (h)
Conversion Table
| Day (d) | Hour (h) |
|---|---|
| 0.1 | 2.4 |
| 0.5 | 12 |
| 1 | 24 |
| 2 | 48 |
| 5 | 120 |
| 10 | 240 |
| 25 | 600 |
| 50 | 1200 |
| 100 | 2400 |
| 250 | 6000 |
| 500 | 12000 |
| 1000 | 24000 |
How to Convert Manually
Use these steps to convert Day values to Hour without the calculator.
- Write down the value in Day (d) that you want to convert.
- Multiply that value by 24.
- For example, 10 Day × 24 = 240 Hour.
- Label the result as Hour (h).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Day and one Hour.
About Day and Hour
The day is 86,400 seconds (24 hours). Deadlines, rental periods, and medication schedules count in days. The hour is 3,600 seconds (60 minutes). Work shifts, travel durations, and hourly wages are stated in hours. One Day equals 24 Hour (1 d = 24 h). Day to Hour conversion comes up most often in project deadlines and in rental and subscription periods, typically when figures need restating for work hours and wages.
Precision and Rounding: Units up to the week are exact; months, years, decades, and centuries are calendar averages (this converter uses a 365-day year and a month of one twelfth of that), so converted values are approximations for scheduling, not for date arithmetic. Use a calendar library when exact dates matter.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Day equals 360 Hour.
15 d × 24 = 360 h
FAQ
How do I convert Day to Hour?
Multiply the Day value by 24 to get the equivalent value in Hour.
What is the formula for Day to Hour?
The formula is h = d × 24.
How many Hour are in 1 Day?
1 Day equals 24 Hour.
Can I convert Hour back to Day?
Yes. 1 Hour equals 0.04166666667 Day, and the related converter can reverse the calculation.
What are common names for Day and Hour?
Day is shown as d and may also be searched as days. Hour is shown as h and may also be searched as hours, hr, hrs.
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