How many hours in 1 millisecond?
The answer is 2.7777777777778E-7.

We assume you are converting between **hour** and **millisecond**.

You can view more details on each measurement unit:

hours or
millisecond

The SI base unit for **time** is the second.

1 second is equal to 0.00027777777777778 hours, or 1000 millisecond.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between hours and milliseconds.

Type in your own numbers in the form to convert the units!

You may also want to find out how many days
are between two dates on the calendar. Use the
**date calculator**
to get your age in days or measure the duration of an event.

1 hours to millisecond = 3600000 millisecond

2 hours to millisecond = 7200000 millisecond

3 hours to millisecond = 10800000 millisecond

4 hours to millisecond = 14400000 millisecond

5 hours to millisecond = 18000000 millisecond

6 hours to millisecond = 21600000 millisecond

7 hours to millisecond = 25200000 millisecond

8 hours to millisecond = 28800000 millisecond

9 hours to millisecond = 32400000 millisecond

10 hours to millisecond = 36000000 millisecond

You can do the reverse unit conversion from millisecond to hours, or enter any two units below:

hours to second

hours to year

hours to microsecond

hours to century

hours to minute

hours to shake

hours to quarter

hours to nanosecond

hours to week

hours to decade

The hour was originally defined in Egypt as 1/24 of a day, based on their duo-decimal numbering system (which counted finger joints on each hand).

The SI prefix "milli" represents a factor of
10^{-3}, or in exponential notation, 1E-3.

So 1 millisecond = 10^{-3} arcseconds.

The definition of a second is as follows:

A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.

**ConvertUnits.com** provides an online
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