How many seconds in 1 millisecond?
The answer is 0.001.

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

You can view more details on each measurement unit:

seconds or
millisecond

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

1 second is equal to 1000 millisecond.

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

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

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

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1 seconds to millisecond = 1000 millisecond

2 seconds to millisecond = 2000 millisecond

3 seconds to millisecond = 3000 millisecond

4 seconds to millisecond = 4000 millisecond

5 seconds to millisecond = 5000 millisecond

6 seconds to millisecond = 6000 millisecond

7 seconds to millisecond = 7000 millisecond

8 seconds to millisecond = 8000 millisecond

9 seconds to millisecond = 9000 millisecond

10 seconds to millisecond = 10000 millisecond

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

seconds to fortnight

seconds to nanosecond

seconds to hour

seconds to century

seconds to shake

seconds to month

seconds to year

seconds to minute

seconds to week

seconds to decade

The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.

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.

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