How to convert hours to seconds
To convert hours to seconds, multiply by 3,600. Time conversions help with scheduling, payroll, project estimates, science and everyday planning. A year here is the Gregorian average of 365.2425 days.
Hour to Second conversion table
| Hour (h) | Second (s) |
|---|---|
| 0.1 h | 360 s |
| 0.5 h | 1,800 s |
| 1 h | 3,600 s |
| 2 h | 7,200 s |
| 3 h | 10,800 s |
| 4 h | 14,400 s |
| 5 h | 18,000 s |
| 10 h | 36,000 s |
| 20 h | 72,000 s |
| 25 h | 90,000 s |
| 50 h | 180,000 s |
| 100 h | 360,000 s |
| 500 h | 1,800,000 s |
| 1,000 h | 3,600,000 s |
About the units
Hour (h)
An hour is 60 minutes, or 3,600 seconds.
Second (s)
The second is the SI base unit of time, defined by caesium-133 atomic transitions.
How to use this converter
- Type the number of hours (h) in the input box.
- The result in seconds appears instantly — no button needed.
- See the same value in every other time unit just below.
- Use “Swap units” to convert seconds back to hours.
When you’ll use the hour to second conversion
Converting hours to seconds comes up more often than you might expect — for example when calculating payroll hours, converting video or audio lengths, or estimating how long a project will take. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 h = 3,600 s.
Watch out for these mix-ups
- A year here is the average Gregorian year (365.2425 days), not exactly 365.
- Months vary in length, so “a month” is not a fixed number of days.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many seconds are in one hour?
One hour equals 3,600 seconds. 3,600 is the exact factor used by this converter.
How do I convert hours to seconds?
Multiply the value in hours by 3,600. To go the other way, multiply seconds by 0.000277777777778.
What is 10 h in s?
10 h = 36,000 s. Also, 5 h = 18,000 s and 100 h = 360,000 s.
What is the difference between a hour and a second?
An hour is 60 minutes, or 3,600 seconds. The second is the SI base unit of time, defined by caesium-133 atomic transitions.
Is this tool free and private?
Yes — the Hour to Second is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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