Hour (h)
The hour is a unit of time, used for work schedules, travel time, sleep tracking, and billing rates. Its symbol is h.
h
min
1 hour equals
| Minutes | 60 min |
| Seconds | 3,600 s |
| Days | 0.0416667 d |
About the hour
The hour was first used by ancient Egyptians who divided daytime into 12 parts. The modern fixed-length hour of 3,600 seconds was established with mechanical clocks in the 14th century.
In everyday use the hour appears in work schedules, travel time, sleep tracking, and billing rates. As a point of reference: a flight from London to New York takes about 7 to 8 hours.