How many seconds are in 1 hour?

1 h equals 3600 s. This is an exact conversion factor defined by NIST.

How do I convert hours to seconds?

Multiply the value in h by the conversion factor. For example, 10 h = 36000 s. Use our calculator above for instant results.

Is the hours to seconds conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert hours to seconds offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between hours and seconds?

Hours (h) and Seconds (s) are both units of time but belong to different measurement systems. 1 h = 3600 s. Use the converter above to switch between them instantly.

Hours to Seconds (h → s) — Free Online Converter

h → s Reference Table

h	s
0.001 h	3.6 s
0.002 h	7.2 s
0.003 h	10.8 s
0.004 h	14.4 s
0.005 h	18 s
0.006 h	21.6 s
0.007 h	25.2 s
0.008 h	28.8 s
0.009 h	32.4 s
0.01 h	36 s
0.02 h	72 s
0.03 h	108 s
0.04 h	144 s
0.05 h	180 s
0.06 h	216 s
0.07 h	252 s
0.08 h	288 s
0.09 h	324 s
0.1 h	360 s
0.2 h	720 s
0.3 h	1080 s
0.4 h	1440 s
0.5 h	1800 s
0.6 h	2160 s
0.7 h	2520 s
0.8 h	2880 s
0.9 h	3240 s
1 h	3600 s
1.5 h	5400 s
2 h	7200 s
2.5 h	9000 s
3 h	10800 s
3.5 h	12600 s
4 h	14400 s
4.5 h	16200 s
5 h	18000 s
5.5 h	19800 s
6 h	21600 s
6.5 h	23400 s
7 h	25200 s
7.5 h	27000 s
8 h	28800 s
8.5 h	30600 s
9 h	32400 s
9.5 h	34200 s
10 h	36000 s
11 h	39600 s
12 h	43200 s
13 h	46800 s
14 h	50400 s
15 h	54000 s
16 h	57600 s
17 h	61200 s
18 h	64800 s
19 h	68400 s
20 h	72000 s
25 h	90000 s
30 h	108000 s
35 h	126000 s
40 h	144000 s
45 h	162000 s
50 h	180000 s
55 h	198000 s
60 h	216000 s
65 h	234000 s
70 h	252000 s
75 h	270000 s
80 h	288000 s
85 h	306000 s
90 h	324000 s
95 h	342000 s
100 h	360000 s
120 h	432000 s
125 h	450000 s
130 h	468000 s
140 h	504000 s
150 h	540000 s
160 h	576000 s
175 h	630000 s
180 h	648000 s
200 h	720000 s
225 h	810000 s
250 h	900000 s
275 h	990000 s
300 h	1080000 s
350 h	1260000 s
400 h	1440000 s
450 h	1620000 s
500 h	1800000 s
600 h	2160000 s
700 h	2520000 s
750 h	2700000 s
800 h	2880000 s
900 h	3240000 s
1000 h	3600000 s
1200 h	4320000 s
1250 h	4500000 s
1500 h	5400000 s
1750 h	6300000 s
2000 h	7200000 s
2500 h	9000000 s
3000 h	10800000 s
4000 h	14400000 s
4500 h	16200000 s
5000 h	18000000 s
6000 h	21600000 s
7000 h	25200000 s
7500 h	27000000 s
8000 h	28800000 s
9000 h	32400000 s
10000 h	36000000 s
15000 h	54000000 s
20000 h	72000000 s
25000 h	90000000 s
50000 h	180000000 s
75000 h	270000000 s
100000 h	360000000 s

Values based on NIST SP 811 conversion factors

Why Convert Hours to Seconds?

Converting between hours (h) and seconds (s) is one of the most common time conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert h to s saves time and prevents errors.

Time conversion between h and s is essential for project management, astronomy, and high-speed electronics. While day-to-day scheduling is simple, scientific and engineering fields often require converting between vast timescales (millennia) and infinitesimal ones (nanoseconds). Video editors and audio engineers work with frames and samples that require precise time unit conversions to sync media perfectly. In logistics, accurate delivery estimates depend on converting travel durations across time zones and varying speed metrics. Miscalculating time units can lead to missed deadlines, data desynchronization, or navigation errors in GPS systems.

How to Convert Hours to Seconds

To convert hours to seconds, use the following formula:

s = h × 3600

Example: 1 h = 3600 s

For example, 5 h = 18000 s, 10 h = 36000 s, and 100 h = 360000 s. For larger values, 1000 h = 3600000 s. Conversely, 1 s = 0.0002777777778 h. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Decimal time: thinking 1.50 hours is 1 hour 50 minutes (it's 1 hour 30 minutes).
Leap years: assuming every year has 365 days.
Month length: assuming all months are 30 days.

Pro Tips

Excel format: Be careful converting time in Excel; it stores dates as serial numbers.
Time zones: Always specify UTC offset when scheduling international calls.
Seconds in day: There are 86,400 seconds in a standard day.

What is a Hour?

The hour (h) is a unit of time equal to 60 minutes or 3,600 seconds. Historically defined as 1/24 of a day.

Hours are the standard unit for work shifts, travel duration, and daily scheduling worldwide.

What is a Second?

The second (s) is the base unit of time in the International System of Units (SI). Historically based on Earth's rotation, it is now defined by the radiation frequency of the caesium-133 atom.

Seconds are the fundamental unit of time used universally in science, technology, sports, and daily life.

Hours → Seconds

Hours to Seconds Formula