Hours to Days
An instant hours-to-days converter, with the formula and a reference table below.
| Hours | Days |
|---|---|
| 1 hr | 0.041667 day |
| 2 hr | 0.083333 day |
| 3 hr | 0.125 day |
| 5 hr | 0.208333 day |
| 10 hr | 0.416667 day |
| 25 hr | 1.041667 day |
| 50 hr | 2.083333 day |
| 100 hr | 4.166667 day |
How to use
- Enter a value in the Hours field.
- The Days figure appears immediately — no button to press.
- Typing in the Days field converts back to Hours the same way.
- Use the reference table for the values that come up most often.
Hours to Days formula
The factor from hours to days is 0.0416666667.
day = hr × 0.0416666667
Put another way, one hour is exactly 1/24 of a day.
Why this factor: the hour and the day are both defined against the second, so dividing one definition by the other gives 0.0416666667 directly. Both definitions are set out in full below.
To go the other way, divide by 0.0416666667 — or use the Days to Hours converter, which is the same calculation reversed.
Worked example
Start with 15 hr. Multiply by 0.0416666667 to get 0.625 day.
15 hr × 0.0416666667 = 0.625 day
The converter above does this for any value you type, in either direction.
What is an hour?
An hour is sixty minutes — the primary unit of the working day.
Definition: Exactly 3,600 seconds.
Where it is used: Work and billing time, flight durations, and energy quantities such as the kilowatt-hour.
What is a day?
A day is 24 hours, one nominal rotation of the Earth.
Definition: Exactly 86,400 seconds by convention. The Earth's actual rotation drifts slightly, which is what leap seconds correct.
Where it is used: Calendars, project schedules, hotel and rental periods, and interest accrual.
Hours vs Days
The hour and the day belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many days are in an hour?
One hour equals 0.0416666667 days.
What is the formula to convert hours to days?
Multiply the number of hours by 0.0416666667. To reverse it, divide by 0.0416666667 instead.
How do I convert days back to hours?
Divide by 0.0416666667, which is the same as multiplying by 24.
How many days are in 10 hours?
10 hr works out to 0.416667 day.
How is the hour defined?
Exactly 3,600 seconds.