## Measurement unit: microsecond

**Full name:** microsecond

**Plural form:** microseconds

**Symbol:** us

**Alternate spelling:** microsec

**Category type:** time

**Scale factor:** 1.0E-6

## SI unit: second

The SI base unit for time is the second.

1 second is equal to 1000000 microsecond.

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

You can use this form to select from known units:

## Definition: Microsecond

The SI prefix "micro" represents a factor of
10^{-6}, or in exponential notation, 1E-6.

So 1 microsecond = 10^{-6} 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.

## Sample conversions: microsecond