Hour (h)
The hour (h) is 3600 seconds, or 60 minutes. It is a non-SI unit accepted for use with the SI.
Symbol: h
Quantity: time (duration)
SI relation: 1 h = 3600 s (exact)
Derivation: 1 h = 60 min = 3600 s
Exact: yes, by definition
Typical uses
- Work shifts and run hours
- Flow per hour (m³/h) and energy (kWh)
- Filter and lamp service life
Convert hours to other units
| Conversion | 1 h equals | Reverse |
|---|---|---|
| hour to second | 3600 s | second to hour |
| hour to minute | 60 min | minute to hour |
| hour to millisecond | 3600000 ms | millisecond to hour |
| hour to day | 0.04166666667 d | day to hour |
Open the Time Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, non-SI units accepted for use with the SI.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Hour (h). Retrieved October 17, 2026, from https://scientificconverters.com/units/hour/
IEEE
Scientific Converters, "Hour (h)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/hour/