How many seconds is 1 hour?
3,600 seconds
1 hour = 3,600 seconds.
seconds
3,600s
1 hr = 3,600 s
Quick pairs
How 1 hour converts to seconds
Every time conversion goes through the second, which is the SI base unit for time. 1 hour is 3,600 seconds, and dividing that by the length of one second gives the answer.
1 hour = 3,600 seconds 1 × 3,600 = 3,600
Where 1 hour shows up
This conversion is why the kilowatt-hour is the size it is. A watt is one joule per second, so running a kilowatt for 3,600 seconds delivers 3,600,000 joules — 3.6 megajoules, which is exactly one kilowatt-hour. Every electricity bill is denominated in a unit whose value is set by the number of seconds in an hour. The same 3,600 sits behind every other hour-based rate: metres per hour to metres per second, or litres per hour to litres per second, is the identical division.
1 hour in every time unit
The same span, converted once into each unit the tool supports. The last two rows use the Gregorian average.
| Unit | Amount | Basis |
|---|---|---|
| milliseconds | 3,600,000 | Exact definition |
| seconds | 3,600 | Exact definition |
| minutes | 60 | Exact definition |
| hours | 1 | Exact definition |
| days | 0.04167 | Exact definition |
| weeks | 0.005952 | Exact definition |
| months | 0.001369 | Gregorian average |
| years | 0.0001141 | Gregorian average |
Frequently asked questions
How many seconds is 1 hour?
1 hour = 3,600 seconds. 1 hour = 3,600 seconds, so the conversion is 1 × 3,600 = 3,600. That is exact arithmetic — both units have a fixed definition, so there is no rounding beyond the digits shown.
Is this conversion exact?
Yes. Seconds, minutes, hours, days, and weeks all have fixed definitions — 60 seconds to the minute, 60 minutes to the hour, 24 hours to the day, 7 days to the week. Nothing in this conversion touches a month or a year, so no averaging is involved and the only rounding is in the digits displayed.
What is 1 hour in practice?
This conversion is why the kilowatt-hour is the size it is. A watt is one joule per second, so running a kilowatt for 3,600 seconds delivers 3,600,000 joules — 3.6 megajoules, which is exactly one kilowatt-hour. Every electricity bill is denominated in a unit whose value is set by the number of seconds in an hour. The same 3,600 sits behind every other hour-based rate: metres per hour to metres per second, or litres per hour to litres per second, is the identical division.
Related time conversions
Any value, any two units
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