# Microsecond

A **microsecond** is an SI unit of time equal to one millionth (0.000001 or 10^{−6} or 1⁄1,000,000) of a second. Its symbol is **μs**, sometimes simplified to **us** when Unicode is not available.

This article needs additional citations for verification. (July 2009) |

A microsecond is equal to 1000 nanoseconds or 1⁄1,000 of a millisecond. Because the next SI prefix is 1000 times larger, measurements of 10^{−5} and 10^{−4} seconds are typically expressed as tens or hundreds of microseconds.