Seconds to Hours Converter

About the s to h calculation

One second is exactly 0.00027778 hours, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The SI base unit of time, defined by the radiation period of the caesium-133 atom. Sixty minutes, or 3,600 seconds. The basis of timekeeping and of most pay calculations.

Formula

h = s × 0.00027778

1 s = 0.00027778 h
1 h = 3,600 s

Worked example

To convert 3,600 s, multiply by 0.00027778: 3,600 × 0.00027778 = 1 h.

Frequently asked questions

How many hours are in a second?

There are 0.00027778 hours in one second. To convert any amount, multiply the number of seconds by 0.00027778.

How do I convert hours back to seconds?

Divide instead of multiplying, or equivalently multiply by 3,600. One hour is 3,600 seconds.

Is this conversion exact?

For seconds through weeks, yes — they are fixed multiples. The year is the mean Gregorian year of 365.2425 days, which is an average rather than the length of any particular calendar year.

Where is each of these units used?

Seconds: the SI base unit of time, defined by the radiation period of the caesium-133 atom. Hours: sixty minutes, or 3,600 seconds. The basis of timekeeping and of most pay calculations.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units