Hours to seconds

Convert hours to seconds instantly — exact, with a table, common values, and a live calculator.

1 hour equals 3600 seconds.

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Result (seconds)3600 seconds

hours to seconds table

hoursseconds
1 hours3600 seconds
2 hours7200 seconds
3 hours10800 seconds
5 hours18000 seconds
10 hours36000 seconds
15 hours54000 seconds
20 hours72000 seconds
24 hours86400 seconds
30 hours108000 seconds
40 hours144000 seconds
45 hours162000 seconds
50 hours180000 seconds
60 hours216000 seconds
75 hours270000 seconds
90 hours324000 seconds
100 hours360000 seconds
120 hours432000 seconds
168 hours604800 seconds
200 hours720000 seconds
250 hours900000 seconds
500 hours1800000 seconds
1000 hours3600000 seconds

seconds to hours (reverse)

secondshours
1 seconds0.000278 hours
2 seconds0.000556 hours
3 seconds0.000833 hours
5 seconds0.00139 hours
10 seconds0.00278 hours
15 seconds0.00417 hours
20 seconds0.00556 hours
24 seconds0.00667 hours
30 seconds0.00833 hours
40 seconds0.0111 hours
45 seconds0.0125 hours
50 seconds0.0139 hours
60 seconds0.0167 hours
75 seconds0.0208 hours
90 seconds0.025 hours
100 seconds0.0278 hours
120 seconds0.0333 hours
168 seconds0.0467 hours
200 seconds0.0556 hours
250 seconds0.0694 hours
500 seconds0.139 hours
1000 seconds0.278 hours

Common amounts

hoursseconds
1 hours3600 seconds
2 hours7200 seconds
3 hours10800 seconds
5 hours18000 seconds
7 hours25200 seconds
10 hours36000 seconds
12 hours43200 seconds
15 hours54000 seconds
24 hours86400 seconds
30 hours108000 seconds
60 hours216000 seconds
90 hours324000 seconds

How it scales

900001800002700003600000255075100hours

1 day in other units

24hours1,440minutes86,400seconds

The ratio at a glance

1 hours3600 seconds

How the time units relate

These units relate by fixed, exact ratios: 1 minute = 60 seconds, 1 hour = 60 minutes = 3,600 seconds, 1 day = 24 hours = 86,400 seconds, and 1 week = 7 days = 604,800 seconds. In the millisecond range the decimal factor applies: 1 second = 1,000 milliseconds. There is no rounding and no leap-second assumption — every conversion is exact.

Months and years are deliberately left out: a month has 28–31 days and a year has 365 or 365.2425 days, so a fixed conversion would be misleading. Use our dedicated calculators for those — days in a month, days in a year and months to minutes. For more unit pairs, open the time conversion hub.

Related conversions

Frequently asked questions

How much is 1 hour in seconds?

1 hour equals 3600 seconds.

How much is 2 hours in seconds?

2 hours equal 7200 seconds.

How do I convert hours to seconds?

Multiply the time in hours by 3600 to get seconds.

Are these time conversions exact?

Yes. These units have fixed, exact ratios: 1 minute = 60 seconds, 1 hour = 3,600 seconds, 1 day = 86,400 seconds, 1 week = 604,800 seconds, and 1 second = 1,000 milliseconds. There is no rounding and no leap-second assumption.

Why aren't months and years included here?

Months (28–31 days) and years (365 or 365.2425 days) don't have a fixed length, so a simple conversion would be misleading. For those, use our dedicated calculators: days in a month, days in a year, and months to minutes.

What are these time units used for?

Milliseconds and seconds measure short spans (reaction times, latency, sports). Minutes and hours structure the day (appointments, cooking, work). Days and weeks plan longer spans (projects, holidays, deadlines). All relate through the second by a fixed ratio.

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