| Hours (hr) | Seconds (s) |
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To convert hours to seconds, multiply by 3600. One hour = 60 minutes × 60 seconds = 3,600 seconds exactly:
1 hr = 3,600 s. 24 hr = 86,400 s (1 day). 1 week = 604,800 s. 1 year ≈ 31,536,000 s.
Useful time benchmarks in hours and seconds:
To convert hours to seconds, multiply by 3600. One hour = 60 minutes × 60 seconds = 3,600 seconds. For example, 2 hours = 2 × 3600 = 7,200 seconds. One full day (24 hours) = 24 × 3600 = 86,400 seconds. One week = 168 × 3600 = 604,800 seconds.
To go the other way (seconds to hours), divide by 3600. For instance, 10,800 seconds = 10,800 ÷ 3600 = 3 hours. This conversion is frequently needed in physics, engineering, and computing where time intervals are often stored in seconds.
Hours-to-seconds conversion is essential in physics calculations (speed, acceleration, rates of change), programming (Unix timestamps, timers, delays), networking (data transfer rates measured in bits per second), chemistry (reaction rates), and sports science (performance metrics). Many scientific and computing formulas require time in seconds (the SI base unit), even when durations are naturally expressed in hours.
There are exactly 3,600 seconds in one hour. This comes from 60 minutes per hour × 60 seconds per minute = 3,600 seconds. To convert hours to seconds, multiply by 3,600.
One day has 24 hours × 3,600 seconds = 86,400 seconds. This is a commonly used figure in computing (86,400 seconds per day) and physics. A leap second can occasionally make a day 86,401 seconds long.
A standard year (365 days) = 365 × 86,400 = 31,536,000 seconds. A leap year (366 days) = 31,622,400 seconds. A commonly cited approximation is π × 10ⷠ≈ 31,415,927 seconds per year.
2 hours = 2 × 3,600 = 7,200 seconds. Similarly, 1.5 hours = 5,400 seconds, 3 hours = 10,800 seconds, and 8 hours = 28,800 seconds.
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