Hours to Seconds
An hour is 60 minutes, the standard unit for work schedules, travel times, and daily planning. The second is the SI base unit of time, defined by the oscillation frequency of a cesium-133 atom. 1 h equals 3,600 s, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to time, measured here against time's base unit (s) — every other time unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
s = h × 3,600
h = s × ≈0.000277778
Worked example: 5 h × 3,600 = 18,000 s.
Conversion table
| Hour (h) | Second (s) |
|---|---|
| 1 h | 3,600 s |
| 2 h | 7,200 s |
| 3 h | 10,800 s |
| 5 h | 18,000 s |
| 10 h | 36,000 s |
| 20 h | 72,000 s |
| 25 h | 90,000 s |
| 50 h | 180,000 s |
| 100 h | 360,000 s |
| 250 h | 900,000 s |
| 500 h | 1,800,000 s |
| 1,000 h | 3,600,000 s |
Frequently asked
- How many Seconds in a hour?
- 1 h equals 3,600 s.
- How do I convert Hours to Seconds?
- Multiply the value in h by 3,600 to get s. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Hour and Second are both defined by a fixed conversion factor to time's base unit (s), so the result shown is exact to the precision displayed, not an approximation.