Days to Hours Converter
Convert days to hours instantly. One day equals exactly 24 hours. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert days to hours
Worked example: convert 15 days to hours. Using hours ← days × 24, we get 15 × 24 = 360 h. To check the result, convert back: 360 h ÷ 24 = 15 d.
Days to hours chart
| Days (d) | Hours (h) |
|---|---|
| 1 d | 24 h |
| 2 d | 48 h |
| 3 d | 72 h |
| 4 d | 96 h |
| 5 d | 120 h |
| 6 d | 144 h |
| 8 d | 192 h |
| 10 d | 240 h |
| 12 d | 288 h |
| 15 d | 360 h |
| 20 d | 480 h |
| 25 d | 600 h |
| 30 d | 720 h |
| 40 d | 960 h |
| 50 d | 1,200 h |
| 75 d | 1,800 h |
| 100 d | 2,400 h |
| 150 d | 3,600 h |
| 200 d | 4,800 h |
| 250 d | 6,000 h |
| 500 d | 12,000 h |
| 1,000 d | 24,000 h |
Hours to days (reverse)
| Hours (h) | Days (d) |
|---|---|
| 1 h | 0.04166667 d |
| 2 h | 0.08333333 d |
| 5 h | 0.2083333 d |
| 10 h | 0.4166667 d |
| 20 h | 0.8333333 d |
| 50 h | 2.083333 d |
| 100 h | 4.166667 d |
| 250 h | 10.41667 d |
| 500 h | 20.83333 d |
| 1,000 h | 41.66667 d |
About the day and the hour
A day is 24 hours, or 86,400 seconds. A solar day varies slightly, but civil time defines the day as exactly 86,400 seconds.
An hour is 60 minutes or 3,600 seconds. Working time, travel time, billing and battery capacity (watt-hours) use hours.
One day is 24 times the size of one hour, so it takes fewer days than hours to express the same amount.
Everyday sizes in days and hours
| Everyday example (approximate) | In days | In hours |
|---|---|---|
| A lecture | 0.034722 d | 0.83333 h |
| A feature film | 0.083333 d | 2 h |
| A working day | 0.33333 d | 8 h |
| A long-haul flight | 0.41667 d | 10 h |
| A work week | 1.6667 d | 40 h |
| A school year of 180 days | 180 d | 4,320 h |
Days to hours FAQ
How many hours are in one day?
One day equals exactly 24 hours. In the other direction, one hour equals 0.041666667 days.
How do I convert days to hours without a calculator?
convert 15 days to hours. Using hours ← days × 24, we get 15 × 24 = 360 h. To check the result, convert back: 360 h ÷ 24 = 15 d. For a quick estimate, round the factor to 24. Then 15 d is about 360 h, compared with the exact 360 h (an error of 0%). That is close enough for planning, but use the calculator above when the number matters.
What is a feature film in hours?
A feature film is about 0.083333 days, which is 2 hours. Treat that as an approximate everyday figure rather than an official measurement.
Are the days and hours the same in every country?
A civil day is 86,400 seconds (24 hours); daylight-saving changes make some local days 23 or 25 hours long. An hour is exactly 3,600 seconds in civil time.