Hours to Seconds converter

Quick reference

Hours	Seconds
1	3,600
2	7,200
5	18,000
10	36,000
20	72,000
25	90,000
50	180,000
100	360,000
250	900,000
500	1,800,000
1,000	3,600,000

About time units

Time units are the most familiar and the most irregular: 60 seconds to a minute, 60 minutes to an hour, 24 hours to a day, then suddenly 7 to a week. The 'year' here is the Julian year of exactly 365.25 days, the astronomer's convention, since the calendar year varies with leap years. These conversions show up in payroll (hours to days), project planning (days to weeks), and anywhere a duration in one unit needs to make intuitive sense in another.

More time conversions

Seconds → Hours Minutes → Hours Hours → Minutes Days → Hours Hours → Days Weeks → Days Days → Weeks Years → Days All converters

Frequently asked questions

What is the exact formula for Hours to Seconds?

Multiply the Hours value by 3,600. This comes from the exact unit definitions, not a rounded approximation.

Is this conversion exact?

The underlying ratio is exact where a legal definition exists (for example, 1 inch = 25.4 mm exactly). Displayed results are rounded to six decimal places for readability.

Can I convert Seconds back to Hours?

Yes. Use the reverse converter linked below, or just swap which field you type into: the live converter recalculates either direction.