The hour is a widely used time unit equal to 3,600 seconds.
The hour grew out of long-standing civil and astronomical timekeeping traditions and remains essential in planning and operations.
Measurement system: Non-SI unit used with SI. SI equivalent: 1 h = 3600 s.
Hour facts
- Unit name
- Hour
- Symbol
- h
- Category
- Time
- Measurement system
- Non-SI unit used with SI
- SI equivalent
- 1 h = 3600 s
- Common uses
- Work shifts, travel, energy use and daily schedules
Definition of the hour
The hour is a widely used time unit equal to 3,600 seconds.
Measurement system and SI relationship
Non-SI unit used with SI
SI equivalent: 1 h = 3600 s
History of the hour
The hour grew out of long-standing civil and astronomical timekeeping traditions and remains essential in planning and operations.
Where is the hour used?
Work shifts, travel, energy use and daily schedules