**Full name:** millisecond

**Plural form:** milliseconds

**Symbol:** ms

**Alternate spelling:** millisec

**Category type:** time

**Scale factor:** 0.001

The SI base unit for time is the second.

1 second is equal to 1000 millisecond.

Valid units must be of the **time** type.

You can use this form to select from known units:

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.

millisecond to week

millisecond to hour

millisecond to Julian month

millisecond to sidereal year

millisecond to tropical month

millisecond to anomalistic month

millisecond to minute

millisecond to Gaussian year

millisecond to fortnight