How do I convert hours to seconds?

Multiply the hour value by 3600. So x h × 3600 = the equivalent in s.

What is 100 hours in seconds?

100 hours equals 360000 seconds.

How do I convert back from seconds to hours?

Multiply the second value by 0.000277778. For example, 1 s = 0.000277778 h.

Is the hour bigger than the second?

Yes. 1 hour is larger than 1 second — specifically 3600 times larger.

Are these conversion factors exact?

Yes. The factor of 3600 is derived directly from the SI definitions of hour and second.

Hours to Seconds Converter

1 h = 3600 s

1 hour equals 3600 seconds. To convert hours to seconds, multiply the hour value by 3600. For quick reference: 1 h = 3600 s, 5 h = 18000 s, 10 h = 36000 s, 100 h = 360000 s.

From

3600

FormulaSeconds = Hours × 3600

Quick

How to convert hours to seconds

Take your value
Start with your value in hours.
Multiply by 3600
Multiply the hour value by 3600. This is the exact conversion factor from hours to seconds.
Read the result
The product is your value in seconds. For example, 5 h × 3600 = 18000 s.

Conversion formula

The exact factor from hours to seconds is 3600.

Seconds = Hours × 3600

Hours to Seconds conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from hours to seconds
Hours (h)	Seconds (s)
1 h	3600 s
2 h	7200 s
3 h	10800 s
4 h	14400 s
5 h	18000 s
6 h	21600 s
7 h	25200 s
8 h	28800 s
9 h	32400 s
10 h	36000 s
15 h	54000 s
20 h	72000 s
25 h	90000 s
30 h	108000 s
45 h	162000 s
60 h	216000 s
90 h	324000 s
100 h	360000 s
120 h	432000 s
150 h	540000 s
180 h	648000 s
240 h	864000 s
300 h	1080000 s
360 h	1296000 s
450 h	1620000 s
500 h	1800000 s
600 h	2160000 s
750 h	2700000 s
900 h	3240000 s
1000 h	3600000 s
1200 h	4320000 s
1500 h	5400000 s
1800 h	6480000 s
2400 h	8640000 s
3000 h	10800000 s
3600 h	12960000 s
4500 h	16200000 s
6000 h	21600000 s
7200 h	25920000 s
9000 h	32400000 s
10000 h	36000000 s
18000 h	64800000 s
36000 h	129600000 s
43200 h	155520000 s
86400 h	311040000 s
172800 h	622080000 s
604800 h	2177280000 s
1000000 h	3600000000 s
31557600 h	113607360000 s
100000000 h	360000000000 s

Real-world reference

A standard workday is 8 h. A typical movie runs 1.5–2.5 h. In seconds, that gives you: 1 h = 3600 s, 10 h = 36000 s, 100 h = 360000 s.

Frequently asked questions

How many seconds are in 1 hour?: 1 hour equals 3600 seconds.
How do I convert hours to seconds?: Multiply the hour value by 3600. So x h × 3600 = the equivalent in s.
What is 5 hours in seconds?: 5 hours equals 18000 seconds.
What is 10 hours in seconds?: 10 hours equals 36000 seconds.
What is 100 hours in seconds?: 100 hours equals 360000 seconds.
How do I convert back from seconds to hours?: Multiply the second value by 0.000277778. For example, 1 s = 0.000277778 h.
Is the hour bigger than the second?: Yes. 1 hour is larger than 1 second — specifically 3600 times larger.
Are these conversion factors exact?: Yes. The factor of 3600 is derived directly from the SI definitions of hour and second.

About the hour and the second

The hour

The hour (h) equals exactly 3,600 seconds, or 60 minutes. It is the standard unit for daily scheduling, employment, and short-distance travel time. Like the minute, it is accepted for use with the SI but is not strictly part of the SI system.

The second

The second (s) is the SI base unit of time. It has been defined since 1967 in terms of the cesium-133 atomic transition, specifically as 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.