Physical Quantity | Unit Name | Unit Symbol | Expression in SI Units |
---|---|---|---|

time | minute | min | 60 s |

time | hour | h | 60 min = 3600 s |

time | day | d | 24 h = 86 400 s |

angle | degree | ° | (π /180) rad |

angle | minute | ' | (1/60)° = ( π/10 800) rad |

angle | second | " | (1/60)' = (π /648 000) rad |

volume | litre | l, L | 1 dm^{3} = 10^{-3} m^{3} |

mass | tonne | t | 10^{3} kg |

field level, power level, sound pressure level, logarithmic decrement | neper | Np | 1, dimensionless |

field level, power level, sound pressure level, attenuation | bel | B | (1/2) ln 10 (Np) dimensionless |

energy | electronvolt | eV | 1 eV = 1.602 18 x 10^{-19} Japproximately |

mass | unified atomic mass unit | u | 1 u = 1.660 54 x 10^{-27} kgapproximately |

length | astronomical unit | ua | 1 ua = 1.495 98 x 10^{11} mapproximately |

The above table lists non-SI units which are accepted for use with the SI. It includes units which are in common everyday use, in particular the traditional units of time and of angle, together with a few other units which have assumed technical importance. Also included at the bottom of the table are three non-SI units, whose values expressed in SI units must be obtained by experiment and are therefore not known exactly. Their values are given with their combined standard uncertainty, which apply to the last two digits, shown in parentheses. These units are in common use in certain specialised fields.

**Si Units:**

Index of Unit Converters |

To use the measurement conversion calculators simply enter a number value into the desired field and click calculate. All results shown will be equivalent values. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Values of 10 000 or greater will be displayed in the e-format e.g. 2.3456e7 which equals 2.3456 x 10

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