Hours to Seconds Converter
Type a value in hours to see it in seconds as you type, with the exact formula and a reference chart.
- Free
- No sign-up
- Private
How this was calculated
- 1 hour = 3,600 seconds
- 8 × 3,600 = 28,800 s
| h | s |
|---|---|
| 0.25 h | 900 s |
| 0.5 h | 1,800 s |
| 0.75 h | 2,700 s |
| 1 h | 3,600 s |
| 1.5 h | 5,400 s |
| 2 h | 7,200 s |
| 2.5 h | 9,000 s |
| 3 h | 10,800 s |
| 4 h | 14,400 s |
| 5 h | 18,000 s |
| 6 h | 21,600 s |
| 8 h | 28,800 s |
| 10 h | 36,000 s |
| 12 h | 43,200 s |
| 24 h | 86,400 s |
| 48 h | 172,800 s |
| 100 h | 360,000 s |
| s | h |
|---|---|
| 60 s | 0.0166667 h |
| 600 s | 0.166667 h |
| 900 s | 0.25 h |
| 1,000 s | 0.277778 h |
| 1,800 s | 0.5 h |
| 2,000 s | 0.555556 h |
| 3,000 s | 0.833333 h |
| 3,600 s | 1 h |
| 5,000 s | 1.38889 h |
| 7,200 s | 2 h |
| 10,000 s | 2.77778 h |
| 18,000 s | 5 h |
How to convert hours to seconds
1 hour = 3,600 seconds. To convert hours to seconds, multiply by 3,600. An hour is 60 minutes, 3,600 seconds. The second is the SI base unit of time, defined by the cesium-133 transition.
Worked examples
- 1.5 hours = 5,400 s (1.5 × 3,600)
- 8 hours = 28,800 s (8 × 3,600)
- 24 hours = 86,400 s (24 × 3,600)
Where this conversion comes up
Hours are used for work schedules, payroll, flights and battery life; seconds for stopwatches, video timing and physics. An hour is 3,600 seconds (60 × 60). Needed when a timer, video or data log counts in seconds: 2.5 h is 9,000 s and a full day is 86,400 s.
Quick estimate
Multiply by 3,600, or by 36 and add two zeros.
Common mistakes
- Dividing instead of multiplying. A second is smaller than a hour, so the number of seconds must come out larger: 1.5 hours = 5,400 s.
- Reading the remainder as a decimal. 1 h 30 min is 1.5 h, not 1.3 h: divide the leftover minutes by 60 (or seconds by 60) to get the decimal part.
Going the other way? Use the seconds to hours converter. Related time converters: minutes to hours, hours to minutes, seconds to minutes, minutes to seconds, hours to days, days to hours.
Frequently asked questions
How do you convert hours to seconds?
Multiply the hours by 3,600. For example, 8 hours is 28,800 seconds.
How many seconds are in one hour?
One hour is 3,600 seconds. An hour is 60 minutes, 3,600 seconds.
What is 24 hours in seconds?
24 hours is 86,400 seconds.
Is there a quick way to estimate hours to seconds?
Multiply by 3,600, or by 36 and add two zeros.