Convert hours to days
Convert hours to days instantly. 1 h = 0.041667 d. Formula, worked examples and a quick reference table.
Last updated
One hour equals 0.041667 days. To convert any number of hours to days, multiply by 0.04166667.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Time conversions are exact down to the day and approximate above it. Seconds, minutes, hours and days have fixed ratios, but a month has no fixed length and a year has two — 365 days in the calendar and 365.25 in the astronomical convention used here. For anything with legal or contractual weight, count the actual calendar dates rather than converting a duration, because the difference accumulates precisely where it is least welcome.
hours to days formula
To go the other way, use hour = day ÷ 0.04166667.
About these units
The hour is 3,600 seconds. Its length is arbitrary in physical terms: it descends from dividing daylight into twelve parts, which meant the hour changed with the seasons until mechanical clocks fixed it.
A day is exactly 86,400 seconds by convention, though the Earth’s actual rotation drifts slightly against it — the discrepancy leap seconds were introduced to absorb.
Hour is also written hours, hr and hrs. Day is also written days.
Sources
hours to days conversion table
| Hour | Day |
|---|---|
| 1 h | 0.04167 d |
| 2 h | 0.08333 d |
| 3 h | 0.125 d |
| 5 h | 0.2083 d |
| 10 h | 0.4167 d |
| 20 h | 0.8333 d |
| 25 h | 1.0417 d |
| 50 h | 2.0833 d |
| 100 h | 4.1667 d |
| 250 h | 10.4167 d |
| 500 h | 20.8333 d |
| 1,000 h | 41.6667 d |
Frequently asked questions
How many days are in a hour? +
There are 0.041667 days in one hour.
What is 10 h in d? +
10 h equals 0.4167 d. Multiply 10 by 0.04166667.
How do I convert day back to hour? +
Use hour = day ÷ 0.04166667. The converter above handles both directions, or see our dedicated days to hours page.
How accurate is this hour to day conversion? +
The factor used is 0.0416666667, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate h to d in my head? +
Divide by 24. That matches the true factor of 0.041667 exactly, so no adjustment is needed for a mental estimate.