# Engineering Statics/Appendices/Conversion Factors

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### U.S. Customary Units to SI Units[edit]

To convert from | To | Multiply by |
---|---|---|

ft/sec^2 | m/s^2 | |

in/sec^2 | m/s^2 | |

ft^2 | m^2 | |

in^2 | m^2 | |

lbm/in^3 | kg/m^3 | |

lbm/ft^3 | kg/m^3 | |

kip (1000 lb) | N | |

lb | N | |

ft | m | |

in | m | |

mi (U.S. statute) | m | |

mi (international nautical) | m | |

lbm | kg | |

slug (lb-sec^2/ft) | kg | |

ton (2000 lbm) | kg | |

lb-ft | N-m | |

lb-in | N-m | |

in^4 | m^4 | |

lb-ft-sec^2 | kg-m^2 | |

lb-sec | kg-m/s | |

lb-ft-sec | kg-m^2/s | |

ft-lb/min | W | |

hp (550 ft-lb/sec) | W | |

atm (14.7 lb/in^2) | N/m^2 or Pa | |

lb/ft^2 | N/m^2 or Pa | |

lb/in^2 or psi | N/m^2 or Pa | |

lb/in | N/m | |

ft/sec | m/s | |

knot (nautical mi/hr) | m/s | |

mi/hr | m/s | |

mi/hr | km/h | |

ft^3 | m^3 | |

in^3 | m^3 | |

BTU | J | |

ft-lb | J | |

kw-h | J | |

* Exact value |