The ** conversion calculator** converts to and from **acres, hectares, square centimeters, square feet, square inches, square kilometers, square meters, square miles, square millimeters, square yards** as well as other less commonly used units (see below). Select what you want to convert from and what you want to convert to. Then press the "Conversion calculator" button.

Unit | Symbol | Description |
---|---|---|

acre | ac | The acre is a unit of measure for surface typically used to express the size of land. |

acre (survey) | ac | The US Survey acre is the standard acre in the United States and its very slightly different from the international acre. |

centiare | ca | The centiare is used some countries and is equal to 1 square meter. |

hectare | ha | The hectare is equal to 1 square hectometer. It's mostly used to measure land. |

square astronomical unit | au² | This unit of measure is not used. It's made available for completeness. |

square attometer | am² | Unit of measure from the metric system used to specify area. One square attometer is equal to 1E-036 square meters. |

square cable | cable² | Unused |

square centimeter | cm² | Unit of measure from the metric system used to specify area. One square centimeter is equal to 0.0001 square meters. |

square chain | ch² | Unused |

square decameter | dam² | Unit of measure from the metric system used to specify area. One square decameter is equal to 100 square meters. |

square decimeter | dm² | Unit of measure from the metric system used to specify area. One square decimeter is equal to 0.01 square meters. |

square fathom | fathom² | Unused |

square femtometer | fm² | Unit of measure from the metric system used to specify area. One square femtometer is equal to 1E-030 square meters. |

square foot | ft² | One square foot is equal to 144 square inches. |

square foot (survey) | ft² | One square foot (survey) is equal to 144 square inches (survey). |

square furlong | fur² | Unused |

square hand | hh² | Unused |

square hectometer | hm² | Unit of measure from the metric system used to specify area. One square hectometer is equal to 10000 square meters, |

square inch | in² | One square international inch is equal to 6.4516 square centimeters. |

square kilometer | km² | Unit of measure from the metric system used to specify area. One square kilometer is equal to 1000000 square meters, |

square league (land) | leagues² | Unused |

square league (sea) | leagues² | Unused |

square li (Chinese) | li² | Unused |

square light-year | ly² | Unused. |

square link | li² | Unused |

square meter | m² | Metric system unit to specify area. |

square micrometer | um² | Unit of measure from the metric system used to specify area. One square micrometer is equal to 0.000000000001 square meters. |

square mil | mil² | The square mil is usually used to measure the section of wires. |

square mile | mi² | One square mile is equal to 640 acres. |

square mile (survey) | mi² | One square survey mile is equal to 640 survey acres. |

square millimeter | mm² | Unit of measure from the metric system used to specify area. One square millimeter is equal to 0.000001 square meters. |

square nanometer | nm² | Unit of measure from the metric system used to specify area. One square nanometer is equal to 1E-018 square meters. |

square nautical mile | nmi² | Unused. |

square picometer | pm² | Unit of measure from the metric system used to specify area. One square picometer is equal to 1E-024 square meters. |

square rod | rd² | Unused |

square thou | thou² | Unused |

square yard | yd² | One square yard is equal to 9 square feet. |