How many seconds are in a hour?

1 h = 3600 s. To convert any amount, multiply by 3600.

How do you convert hours to seconds?

Multiply the number of hours by 3600 to get seconds. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Time

Hours to seconds converter

Convert hours (h) to seconds (s). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert hours to seconds— the formula

Hours convert to seconds by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

s = h × 3600

h = s × 0.000278

Second: SI base unit (BIPM). Days, weeks: exact. Month = 30.4375 days (year/12). Year = 365.25 days (Julian year, used in astronomy).

Questions

Frequently asked questions

How many seconds are in a hour?
1 h = 3600 s. To convert any amount, multiply by 3600.
How do you convert hours to seconds?
Multiply the number of hours by 3600 to get seconds. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.