Convert Hours to Seconds
One hour equals 3,600 seconds. Type any value to convert hours to seconds instantly — with a full reference table below.
Convert Hours to Seconds
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How to convert Hours to Seconds
To convert hours to seconds, multiply by 3,600. One hour equals 3,600 s, and one second equals 0.000277778 hr.
- Take the value in hours — for example 7.5 hr.
- Multiply by 3,600 (the number of seconds in one hour).
- 7.5 × 3,600 = 27,000 s.
Hours to Seconds conversion table
| Hours | Seconds |
|---|---|
| 1 hr | 3,600 s |
| 2 hr | 7,200 s |
| 3 hr | 10,800 s |
| 5 hr | 18,000 s |
| 10 hr | 36,000 s |
| 15 hr | 54,000 s |
| 20 hr | 72,000 s |
| 30 hr | 108,000 s |
| 45 hr | 162,000 s |
| 60 hr | 216,000 s |
| 90 hr | 324,000 s |
| 120 hr | 432,000 s |
| 365 hr | 1,314,000 s |
| Seconds | Hours |
|---|---|
| 1 s | 0.000277778 hr |
| 2 s | 0.000555556 hr |
| 3 s | 0.000833333 hr |
| 5 s | 0.00138889 hr |
| 10 s | 0.00277778 hr |
| 15 s | 0.00416667 hr |
| 20 s | 0.00555556 hr |
| 30 s | 0.00833333 hr |
| 45 s | 0.0125 hr |
| 60 s | 0.0166667 hr |
| 90 s | 0.025 hr |
| 120 s | 0.0333333 hr |
| 365 s | 0.101389 hr |
About converting Hours to Seconds
Hours (hr) and Seconds (s) are both units of time. The exact factor is 1 hr = 3,600 s, so multiply by 3,600 to go from hours to seconds (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Seconds to Hours converter, or the full unit converter for every unit at once.
Real-world time in hours and seconds
| Example | Hours | Seconds |
|---|---|---|
| Sunlight's trip to Earth | ≈ 0.138611 hr | ≈ 499 s |
| A typical work day (8 h) | 8 hr | 28,800 s |
| A full-time work year (2,080 h) | 2,080 hr | 7,488,000 s |
| A common year (365 days) | 8,760 hr | 31,536,000 s |
| A leap year (366 days) | 8,784 hr | 31,622,400 s |
“≈” marks typical values; the rest are defined or measured figures.
The units
60 minutes, 3,600 seconds.
Used for: Work, travel and billing.
The SI base unit of time, defined by 9,192,631,770 oscillations of a caesium-133 atom.
Used for: Timing everything.
Seconds, minutes, hours, days and weeks are exact. Months and years are averages of the Gregorian calendar (a year of 365.2425 days, a month of 30.436875 days), because real months and years vary in length.