Days to hours
Multiply days by 24 to get hours.
5 d = 120 h
How to convert days to hours
The hour is exactly 60 minutes (3600 seconds). The day is exactly 24 hours (86 400 seconds).
Worked example — 5 d: 5 × 24 = 120 h.
Days to hours table
| Days | Hours |
|---|---|
| 0.5 d | 12 h |
| 1 d | 24 h |
| 2 d | 48 h |
| 3 d | 72 h |
| 5 d | 120 h |
| 7 d | 168 h |
| 14 d | 336 h |
| 30 d | 720 h |
| 365 d | 8,760 h |
Reverse and related
About days and hours
Day (d)
1 d = 24 hDefinition. Exactly 24 hours (86 400 seconds)
History and origin
The day is based on one rotation of the Earth and is fixed for timekeeping at exactly 24 hours, or 86 400 seconds. The natural day varies slightly, so a mean value is used.
Current use
Days are the basic unit of the calendar and of everyday durations.
Source: BIPM SI Brochure (2019); the second is defined by the caesium-133 transition
Hour (h)
1 h = 0.0416667 dDefinition. Exactly 60 minutes (3600 seconds)
History and origin
The hour divides the day into 24 parts, a scheme inherited from ancient Egypt, and equals exactly 60 minutes or 3600 seconds. Fixed-length hours replaced older seasonal hours as mechanical clocks spread.
Current use
Hours structure the working day, schedules and pay, and are read off every clock.
Source: BIPM SI Brochure (2019); the second is defined by the caesium-133 transition
Where people use this
Days: calendars, durations. Hours: schedules, work and pay. 1 day is exactly 24 hours.
Every value is carried to full double precision; the display is rounded.
Both units are defined in BIPM SI Brochure (2019); the second is defined by the caesium-133 transition.
Questions people ask
How many hours in a day?
One day is exactly 24 hours.
How many hours is 3 days?
3 days is 72 hours.
How many hours is a week?
A 7-day week is 168 hours.