Hours to ms Converter

How to convert hours to milliseconds

Formulams = h × 3,600,000

Multiply the value in hours by 3,600,000. To go the other way, multiply by 2.777777778×10⁻⁷ (or divide by 3,600,000).

An hour is larger than a millisecond: one hour contains 3,600,000 milliseconds.

Worked examples

1 hour1 h × 3,600,000 = 3,600,000 ms
5 hours5 h × 3,600,000 = 18,000,000 ms
10 hours10 h × 3,600,000 = 36,000,000 ms
20 hours20 h × 3,600,000 = 72,000,000 ms
100 hours100 h × 3,600,000 = 360,000,000 ms

Hours to milliseconds conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Hours to milliseconds: 0.1–10 h
Hours (h)	Milliseconds (ms)
0.1 h	360,000 ms
0.25 h	900,000 ms
0.5 h	1,800,000 ms
1 h	3,600,000 ms
2 h	7,200,000 ms
3 h	10,800,000 ms
4 h	14,400,000 ms
5 h	18,000,000 ms
6 h	21,600,000 ms
7 h	25,200,000 ms
8 h	28,800,000 ms
9 h	32,400,000 ms
10 h	36,000,000 ms

Hours to milliseconds: 12–1,000 h
Hours (h)	Milliseconds (ms)
12 h	43,200,000 ms
15 h	54,000,000 ms
20 h	72,000,000 ms
25 h	90,000,000 ms
30 h	108,000,000 ms
40 h	144,000,000 ms
50 h	180,000,000 ms
75 h	270,000,000 ms
100 h	360,000,000 ms
250 h	900,000,000 ms
500 h	1,800,000,000 ms
1,000 h	3,600,000,000 ms

About the units

Hour (h)

Sixty minutes, or 3,600 seconds.

Millisecond (ms)

One thousandth of a second. Network latency and reaction times are measured in milliseconds. One millisecond equals 0.001 seconds (s).

Frequently asked questions

How many milliseconds are in one hour?

There are 3,600,000 milliseconds in one hour, and this value is exact by definition.

How do I convert hours to milliseconds?

Multiply the number of hours by 3,600,000. For example, 10 h × 3,600,000 = 36,000,000 ms.

How many hours are in one millisecond?

One millisecond equals 2.777777778×10⁻⁷ hours. That is the reverse factor, 1 ÷ 3,600,000.

What is 10 hours in milliseconds?

10 h = 36,000,000 ms.

Is this h to ms converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.