4840 square yards | = 1 acre |

640 acres | = 1 square mile |

1 furlong x 1 chain | = 1 acre |

10 square chains | = 1 acre |

1210 square yards | = 1 rood |

1 pole x 1 pole | = 1 square pole (sometimes called a pole) |

40 (square) poles | = 1 rood |

1 furlong x 1 pole | = 1 rood |

4 roods | = 1 acre |

A pole is the same length as a rod or a perch. |

A rod or perch may also be a measure of area. |