Convert Hour to Second (h → s)

The hour equals 3,600 seconds and structures workdays, broadcasts, and travel schedules around the world.

Hour

Second

3,600

1 h3,600 sNIST · BIPM accuracy

Hour to Second Conversion Table

10 common values

Hour	Second
1 h	3,600 s
5 h	18,000 s
10 h	36,000 s
30 h	108,000 s
60 h	216,000 s
120 h	432,000 s
300 h	1,080,000 s
600 h	2,160,000 s
1,800 h	6,480,000 s
3,600 h	12,960,000 s

How to Convert Hour to Second Manually

Step by Step

Converting hours to seconds is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1
Take your value in hours
Start with the number of hours (h) you want to convert.
2
Multiply by 3,600
The conversion factor from h to s is 3,600. Multiply your value by this number.
3
Read the result in seconds
The result is your value in seconds (s).

Practical Examples

1 h

equals

3,600 s

5 h

equals

18,000 s

10 h

equals

36,000 s

25 h

equals

90,000 s

100 h

equals

360,000 s

Formula

Multiply the value in hours by 3,600. For the reverse direction, multiply by 0.000278.

Forwards = h × 3,600

Reverseh = s × 0.000278

Example: 10 h × 3,600 = 36,000 s

Tips

Use these in everyday conversions

1 h = 60 min = 3600 s.
The official SI symbol is h.
24 h in a day. Use 24-hour time (e.g. 14:30) for unambiguous clarity.

Common Mistakes

Avoid these

Writing "hr" in scientific contexts — the SI symbol is h.
Confusing 12-hour AM/PM with 24-hour time — always check.
Estimating travel times without rest and connections — real door-to-door is usually 30–50% longer.

About Hour and Second

What is the Hour?

The hour equals exactly 3,600 seconds (60 minutes) and is the fundamental unit organizing human days, work schedules, broadcasts, and travel. The 24-hour day is rooted in ancient Egyptian astronomy, which divided the day and night into 12 segments each (originally variable in length depending on season, but standardized to 1/24 of a solar day in the Hellenistic period). Modern civilian and international time systems use the hour as the primary calendar division. Workdays are typically 8 hours, sleep cycles span 7–9 hours, and television programming is built around half-hour and one-hour blocks. The hour relates to the second (3,600 s = 1 h), the minute (60 min = 1 h), and the day (24 h = 1 day). Speed limits in km/h or mph and electricity prices in kWh ($/kWh) embed the hour as the time reference.

Work schedules and billing (hourly wage)
Flight and travel durations
Consumer-electronic battery life (in hours)

Real-world examples

Paris to Tokyo direct flight: 12 h. UK full-time standard: 37.5 h/week. Phone battery life: 8–20 h typical.

What is the Second?

The second is the base SI unit of time. Since 1967, it has been defined by atomic physics: the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. This makes the second extraordinarily reproducible — modern atomic clocks based on optical transitions can keep time to a few parts in 10¹⁸. The second is the foundation of all time measurements: the minute (60 s), the hour (3,600 s), the day (86,400 s). It is also fundamental in physics — speeds (m/s), accelerations (m/s²), frequencies (Hz = 1/s), and Planck's constant all reference the second. International civil time, GPS, and the internet's time synchronization all depend on cesium-based atomic seconds. The second relates to the millisecond (1,000 ms = 1 s), the microsecond, and the nanosecond.