An hour is 3,600 seconds.
Hours to Seconds Converter — h to s
Convert Hours (h) to Seconds (s) using the exact conversion factor (1 hours = 3,600 seconds). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Hours to Seconds converter
Converter
Time Converter
Convert SI time, civil time, historical durations, months, and years.
Context values
Some unit families need one extra value for a physically accurate result.
The second is the SI base unit of time.
Result = input x 3600 / 1.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Hours to Seconds
Hours and Seconds are both everyday units of duration, and converting between them is one of the most routine calculations there is — scheduling, project planning, and billing all depend on it. Hours is most often used for work schedules and everyday timekeeping worldwide.
Formula
seconds = hours × 3600
This factor comes from each unit's defined relationship to the category's base unit: 1 hours equals 3600 base units, and 1 seconds equals 1 base unit, so dividing one by the other gives the direct hours-to-seconds factor of 3600.
Simple example
1 h × 3600 = 3,600 s
1 hours = 3,600 seconds.
Real-world example
24 h × 3600 = 86,400 s
24 hours = 86,400 seconds.
Conversion table
| Hours (h) | Seconds (s) |
|---|---|
| 1 h | 3,600 s |
| 7 h | 25,200 s |
| 24 h | 86,400 s |
| 30 h | 108,000 s |
| 100 h | 360,000 s |
| 365 h | 1,314,000 s |
Reverse conversion: Seconds to Hours
1 s × 0.0002777777778 = 0.0002777778 h
1 seconds = 0.0002777778 hours.
hours = seconds × 0.000277777777778
For a page dedicated to this direction, see Seconds to Hours.
Hours vs. Seconds
| Aspect | Hours | Seconds |
|---|---|---|
| Family | Non-SI unit accepted for use with SI | SI base unit |
| Typical use | Work schedules and everyday timekeeping worldwide | Fundamental unit for all timekeeping and scientific measurement |
| Where it's used | Universal | Universal |
Understanding the Hours
Hours (h) measures time. An hour is 60 minutes (3,600 seconds); dividing the day into 24 hours dates to ancient Egyptian timekeeping. It is classified as a Non-SI unit accepted for use with SI.
Where it's used: Universal
Uses of the Hours today
- Work schedules and everyday timekeeping worldwide
- Travel time and duration planning
- Billing (hourly rates, parking, rentals)
History of the Hours
The 24-hour day traces to ancient Egypt, which divided daytime and nighttime into 12 parts each using sundials and star-based timekeeping; the modern fixed-length hour (rather than daylight-proportional 'temporal hours') became standard with the spread of mechanical clocks in medieval Europe.
Historical origin. Hours was not the invention of a single named person; it developed through the process described above.
Understanding the Seconds
Seconds (s) measures time. The second is the SI base unit of time, currently defined via a fixed number of cesium atomic transitions. It is classified as a SI base unit.
Where it's used: Universal
Uses of the Seconds today
- Fundamental unit for all timekeeping and scientific measurement
- Basis for derived units like speed (m/s) and frequency (Hz)
History of the Seconds
The second originated from dividing the day into 24 hours, each into 60 minutes, each into 60 seconds — a sexagesimal (base-60) system inherited from Babylonian astronomy. Since 1967, the second has been defined atomically, as exactly 9,192,631,770 periods of radiation from a cesium-133 transition, decoupling timekeeping from the Earth's slightly irregular rotation.
Historical origin. Seconds was not the invention of a single named person; it developed through the process described above.
Hours — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the hour among accepted non-SI time units.
Seconds — sources
- BIPM — The second (SI base unit) — Current atomic definition and history of the second.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many seconds are in 1 hours?
1 hours equals 3,600 seconds, using the exact defined conversion factor rather than an estimate.
How do I convert hours to seconds?
Multiply the hours value by 3600. The converter above does this instantly to whatever precision you set.
How do I convert seconds back to hours?
Use the reverse factor: 1 seconds equals 0.0002777778 hours. You can also use the swap control in the converter above to flip the direction instantly.
What is a hours?
Hours (h) measures time. An hour is 60 minutes (3,600 seconds); dividing the day into 24 hours dates to ancient Egyptian timekeeping. It is classified as a Non-SI unit accepted for use with SI.
What is a seconds?
Seconds (s) measures time. The second is the SI base unit of time, currently defined via a fixed number of cesium atomic transitions. It is classified as a SI base unit.
Is the hours to seconds conversion exact?
Yes. Both hours and seconds are defined by fixed standards rather than physical artifacts, so the factor of 3600 used above is exact to as many digits as you choose to display.
Where is the hours still used today?
Universal