Hours to Seconds Converter
Convert hours to seconds and back. Enter hours to get seconds (3,600 per hour) plus an h:m:s breakdown and minutes, or flip to seconds to hours. 2 hours is 7,200 seconds.
Example: with Amount 2 · Direction Hours → seconds → Converted amount: 7,200 seconds.
- In whole units2 h 0 min 0 s
- Also equals120 minutes
Computed by the calculator below using its default values. Change any input to see your own numbers.
1 hour = 60 minutes x 60 seconds = 3,600 seconds. 2 hours is 7,200 seconds.
Hours to seconds
One hour is 3,600 seconds — 60 minutes of 60 seconds each — so you multiply hours by 3,600 to get seconds. It is the unit scientific timers, countdowns, and rate calculations run on: 2 hours is 7,200 seconds, and a 24-hour day is 86,400.
The h:m:s breakdown reads the total back out in hours, minutes, and seconds, so a value like 5,400 seconds shows as 1 h 30 min 0 s. The conversion is exact both ways.
How it’s calculated
Seconds = hours x 3,600 (1 hour = 60 x 60 = 3,600 seconds). Reverse mode divides seconds by 3,600. The h:m:s breakdown takes whole hours, then whole minutes, then leftover seconds. Minutes divide seconds by 60.
Standard SI-style seconds; leap seconds are not modeled.
Hours to seconds quick reference
| Hours | Seconds | Minutes |
|---|---|---|
| 0.5 h | 1,800 s | 30 min |
| 1 h | 3,600 s | 60 min |
| 2 h | 7,200 s | 120 min |
| 8 h | 28,800 s | 480 min |
| 24 h | 86,400 s | 1,440 min |
Computed with 1 hour = 3,600 seconds.
Common mistakes
- Multiplying by 100 or 60 instead of 3,600 seconds per hour.
- Reading 1.5 hours as 1 hour 50 minutes; it is 1 h 30 min, or 5,400 seconds.
- Confusing seconds per hour (3,600) with seconds per day (86,400).
Frequently asked questions
How do I convert hours to seconds?
Multiply the hours by 3,600, since one hour is 60 x 60 = 3,600 seconds. For example, 2 hours x 3,600 = 7,200 seconds.
How many seconds are in an hour?
Exactly 3,600. A full day is 24 x 3,600 = 86,400 seconds.
How do I turn seconds back into hours?
Divide by 3,600. Switch to Seconds → hours; 3,600 seconds is 1 hour and 7,200 is 2 hours.
How many seconds is 1.5 hours?
5,400 seconds. That is 1 hour (3,600) plus 30 minutes (1,800).