# Second conversions

The second conversion selector on this page selects the time measurement unit to convert to starting from seconds (s). To make a conversion starting from a unit of time other than second, simply click on the "Reset" button.

## About second

The **second** is the base unit of time in the International System of Units (SI).

One second (s) is equal to 10^{9} nanoseconds (ns), or 10^{6} microseconds (μs) or 10^{3} milliseconds (ms), which are SI units of time. 1 second is also equal to 1/60 minutes (min), or 1/3,600 hours (h) or 1/86,400 days (d), which are non-SI units of time but accepted for use along with other SI units.

The seconds are commonly used throughout the world for timekeeping. Times of this magnitude (i.e., on the second time scale) can be measured by using a clock.

Symbol: s

Plural: seconds

## Subdivisions and multiples of the second using SI prefixes

Subdivisions of the second | ||
---|---|---|

Name | Symbol | Value |

decisecond | ds | 10^{-1} s |

centisecond | cs | 10^{-2} s |

millisecond | ms | 10^{-3} s |

microsecond | μs | 10^{-6} s |

nanosecond | ns | 10^{-9} s |

picosecond | ps | 10^{-12} s |

femtosecond | fs | 10^{-15} s |

attosecond | as | 10^{-18} s |

zeptosecond | zs | 10^{-21} s |

yoctosecond | ys | 10^{-24} s |

Multiples of the second | ||
---|---|---|

Name | Symbol | Value |

decasecond | das | 10^{1} s |

hectosecond | hs | 10^{2} s |

kilosecond | ks | 10^{3} s |

megasecond | Ms | 10^{6} s |

gigasecond | Gs | 10^{9} s |

terasecond | Ts | 10^{12} s |

petasecond | Ps | 10^{15} s |

exasecond | Es | 10^{18} s |

zettasecond | Zs | 10^{21} s |

yottasecond | Ys | 10^{24} s |