Convert seconds to hours
Convert seconds to hours instantly. 1 s = 0.0002778 h. Formula, worked examples and a quick reference table.
Last updated
One second equals 0.0002778 hours. To convert any number of seconds to hours, multiply by 0.00027778.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Time conversions are exact down to the day and approximate above it. Seconds, minutes, hours and days have fixed ratios, but a month has no fixed length and a year has two — 365 days in the calendar and 365.25 in the astronomical convention used here. For anything with legal or contractual weight, count the actual calendar dates rather than converting a duration, because the difference accumulates precisely where it is least welcome.
seconds to hours formula
To go the other way, use second = hour ÷ 0.00027778.
About these units
The second is defined by the caesium atom: 9,192,631,770 oscillations of a particular transition. Every other time unit is now derived from it.
The hour is 3,600 seconds. Its length is arbitrary in physical terms: it descends from dividing daylight into twelve parts, which meant the hour changed with the seasons until mechanical clocks fixed it.
Second is also written seconds, sec and secs. Hour is also written hours, hr and hrs.
Sources
seconds to hours conversion table
| Second | Hour |
|---|---|
| 1 s | 0.0002778 h |
| 2 s | 0.0005556 h |
| 3 s | 0.0008333 h |
| 5 s | 0.001389 h |
| 10 s | 0.002778 h |
| 20 s | 0.005556 h |
| 25 s | 0.006944 h |
| 50 s | 0.01389 h |
| 100 s | 0.02778 h |
| 250 s | 0.06944 h |
| 500 s | 0.1389 h |
| 1,000 s | 0.2778 h |
Frequently asked questions
How many hours are in a second? +
There are 0.0002778 hours in one second.
What is 10 s in h? +
10 s equals 0.002778 h. Multiply 10 by 0.00027778.
How do I convert hour back to second? +
Use second = hour ÷ 0.00027778. The converter above handles both directions, or see our dedicated hours to seconds page.
How accurate is this second to hour conversion? +
The factor used is 0.0002777778, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate s to h in my head? +
Divide by 3,600. That reproduces the exact factor of 0.0002778 to the precision you could read off a result anyway.