Seconds to Hours Converter
Convert seconds to hours instantly. One second equals exactly 0.0002777778 hours. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert seconds to hours
Worked example: convert 35 seconds to hours. Using hours ← seconds ÷ 3,600, we get 35 × 0.0002777777778 = 0.0097222222 h. To check the result, convert back: 0.0097222222 h ÷ 0.0002777777778 = 35 s.
Seconds to hours chart
| Seconds (s) | Hours (h) |
|---|---|
| 1 s | 0.0002777778 h |
| 2 s | 0.0005555556 h |
| 3 s | 0.0008333333 h |
| 4 s | 0.001111111 h |
| 5 s | 0.001388889 h |
| 6 s | 0.001666667 h |
| 8 s | 0.002222222 h |
| 10 s | 0.002777778 h |
| 12 s | 0.003333333 h |
| 15 s | 0.004166667 h |
| 20 s | 0.005555556 h |
| 25 s | 0.006944444 h |
| 30 s | 0.008333333 h |
| 40 s | 0.01111111 h |
| 50 s | 0.01388889 h |
| 75 s | 0.02083333 h |
| 100 s | 0.02777778 h |
| 150 s | 0.04166667 h |
| 200 s | 0.05555556 h |
| 250 s | 0.06944444 h |
| 500 s | 0.1388889 h |
| 1,000 s | 0.2777778 h |
Hours to seconds (reverse)
| Hours (h) | Seconds (s) |
|---|---|
| 1 h | 3,600 s |
| 2 h | 7,200 s |
| 5 h | 18,000 s |
| 10 h | 36,000 s |
| 20 h | 72,000 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 |
About the second and the hour
The second is the SI base unit of time, defined from the radiation of a caesium-133 atom (9,192,631,770 cycles). Stopwatches, video timestamps and speeds use it.
An hour is 60 minutes or 3,600 seconds. Working time, travel time, billing and battery capacity (watt-hours) use hours.
One hour equals 3,600 seconds, which makes the hour the longer unit of the two.
Everyday sizes in seconds and hours
| Everyday example (approximate) | In seconds | In hours |
|---|---|---|
| A TV advert | 30 s | 0.0083333 h |
| A pop song | 210 s | 0.058333 h |
| A lecture | 3,000 s | 0.83333 h |
| A feature film | 7,200 s | 2 h |
| A working day | 28,800 s | 8 h |
| A long-haul flight | 36,000 s | 10 h |
Seconds to hours FAQ
How many hours are in one second?
One second equals exactly 0.0002777777778 hours. In the other direction, one hour equals 3,600 seconds.
How do I convert seconds to hours without a calculator?
convert 35 seconds to hours. Using hours ← seconds ÷ 3,600, we get 35 × 0.0002777777778 = 0.0097222222 h. To check the result, convert back: 0.0097222222 h ÷ 0.0002777777778 = 35 s. For a quick estimate, round the factor to 0.00028. Then 35 s is about 0.0098 h, compared with the exact 0.00972222 h (an error of 0.8%). That is close enough for planning, but use the calculator above when the number matters.
What is a TV advert in hours?
A TV advert is about 30 seconds, which is 0.0083333 hours. Treat that as an approximate everyday figure rather than an official measurement.
Are the seconds and hours the same in every country?
The second is defined by atomic clocks, so it is the same everywhere. An hour is exactly 3,600 seconds in civil time.