Convert Hour (h) to Second (s) instantly. Enter any value — result updates live.
Converting Hour to Second is a common time conversion. One hour (h) equals 3,600 second (s). Hours divide the day and are used for scheduling, work, and travel time worldwide.
This conversion is commonly needed for international time calculations, software performance benchmarking, project management and scheduling. The second is the base SI unit of time, fundamental to all time measurement.
To put hour in perspective: a flight from NYC to Chicago (about 2.5 h). In second, common references include a microwave minute (60 s).
The 24-hour day originates from ancient Egyptian astronomy, which divided daylight and nighttime into 12 hours each using sundials and star charts, regardless of season.
The second was redefined in 1967 based on the vibration frequency of a cesium-133 atom (9,192,631,770 cycles), replacing earlier definitions tied to Earth's slightly irregular rotation.
People frequently convert between hour and second for:
| Hour (h) | Second (s) |
|---|---|
| 1 h | 3,600 s |
| 2 h | 7,200 s |
| 5 h | 18,000 s |
| 10 h | 36,000 s |
| 15 h | 54,000 s |
| 20 h | 72,000 s |
| 25 h | 90,000 s |
| 30 h | 110,000 s |
| 50 h | 180,000 s |
| 100 h | 360,000 s |
| 200 h | 720,000 s |
| 500 h | 1,800,000 s |
| 1000 h | 3,600,000 s |