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Convert Hour to Millisecond

Please provide values below to convert hour [h] to millisecond [ms], or vice versa.

From: hour
To: millisecond


Definition: An hour (symbol: h) is a unit of time conventionally defined as 1/24 of a day and 3,600 seconds. In Coordinated Universal Time, a negative or positive leap second may be incorporated to keep the hour within 0.9 seconds of universal time, making an hour either 3,599 or 3,601 seconds in some cases.

History/origin: The term "hour" is derived from the Anglo-Norman "houre," which was in use around the 13th century.

There have been many definitions of the hour throughout history based on culture or region, such as the hour being divided into 1/12 of a period daylight or darkness. It is believed that the custom of dividing the cycle of day and night into 24 periods began with the ancient Egyptians.

Current use: The hour is used globally as a unit of time. Most forms of employment require a certain number of hours worked per day, with compensation being based on the measured or expected hours worked. Durations starting from 30 minutes (half an hour) are commonly used colloquially.


Definition: A millisecond (symbol: ms) is a unit of time based on the SI (International System of Units) base unit of time, the second, and is equal to one-thousandth of a second.

History/origin: The millisecond is based on the SI unit of second, making use of the SI prefix of "milli," meaning 1/1000.

Current use: The millisecond is used to measure smaller durations of time such as frequency of a soundwave, response time of LCD monitors, the wing flap of insects and birds, and time delays, among many others.

Hour to Millisecond Conversion Table

Hour [h]Millisecond [ms]
0.01 h36000 ms
0.1 h360000 ms
1 h3600000 ms
2 h7200000 ms
3 h10800000 ms
5 h18000000 ms
10 h36000000 ms
20 h72000000 ms
50 h180000000 ms
100 h360000000 ms
1000 h3600000000 ms

How to Convert Hour to Millisecond

1 h = 3600000 ms
1 ms = 2.7777777777778E-7 h

Example: convert 15 h to ms:
15 h = 15 × 3600000 ms = 54000000 ms

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