Hours to Milliseconds Converter

Enter the time in hours below to get the value converted to milliseconds.

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Result in Milliseconds:

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72 hr = 259,200,000 ms

Do you want to convert milliseconds to hours?


How to Convert Hours to Milliseconds

To convert a measurement in hours to a measurement in milliseconds, multiply the time by the following conversion ratio: 3,600,000 milliseconds/hour.

Since one hour is equal to 3,600,000 milliseconds, you can use this simple formula to convert:

milliseconds = hours × 3,600,000

The time in milliseconds is equal to the time in hours multiplied by 3,600,000.

For example, here's how to convert 5 hours to milliseconds using the formula above.
milliseconds = (5 hr × 3,600,000) = 18,000,000 ms

How Many Milliseconds Are in an Hour?

There are 3,600,000 milliseconds in an hour, which is why we use this value in the formula above.

1 hr = 3,600,000 ms

Hours and milliseconds are both units used to measure time. Keep reading to learn more about each unit of measure.

What Is an Hour?

The hour is a period of time equal to 1/24 of a day or 60 minutes.

The hour is an SI accepted unit for time for use with the metric system. Hours can be abbreviated as hr (plural hrs); for example, 1 hour can be written as 1 hr, and 2 hours can be written as 2 hrs.

Learn more about hours.

What Is a Millisecond?

One millisecond is equal to 1/1,000 of a second or 1,000 microseconds.

The millisecond is a multiple of the second, which is the SI base unit for time. In the metric system, "milli" is the prefix for thousandths, or 10-3. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.

Learn more about milliseconds.

Hour to Millisecond Conversion Table

Table showing various hour measurements converted to milliseconds.
Hours Milliseconds
0.000001 hr 3.6 ms
0.000002 hr 7.2 ms
0.000003 hr 10.8 ms
0.000004 hr 14.4 ms
0.000005 hr 18 ms
0.000006 hr 21.6 ms
0.000007 hr 25.2 ms
0.000008 hr 28.8 ms
0.000009 hr 32.4 ms
0.0000001 hr 0.36 ms
0.000001 hr 3.6 ms
0.00001 hr 36 ms
0.0001 hr 360 ms
0.001 hr 3,600 ms
0.01 hr 36,000 ms
0.1 hr 360,000 ms
1 hr 3,600,000 ms

More Hour & Millisecond Conversions