What is the area of a circle with a **DIAMETER** of 18 inches (radius of 9 inches)? How big is a 18 inch circle?

Area of a 18″ diameter circle

254.47 | square inches |

1.7671 | square feet |

0.19635 | square yards |

1,641.7 | square centimeters |

0.16417 | square meters |

(results may be rounded)

The area of a circle is pi times the square of its radius. The radius is half the diameter.

**Area = π * (Diameter / 2) ^{2}**

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Circle Area by Diameter

(results are rounded)

Diameter | in^{2} |
ft^{2} |
cm^{2} |
---|---|---|---|

18.0 in | 254.5 | 1.767 | 1,642 |

18.1 in | 257.3 | 1.787 | 1,660 |

18.2 in | 260.2 | 1.807 | 1,678 |

18.3 in | 263.0 | 1.827 | 1,697 |

18.4 in | 265.9 | 1.847 | 1,716 |

Diameter | in^{2} |
ft^{2} |
cm^{2} |
---|---|---|---|

18.5 in | 268.8 | 1.867 | 1,734 |

18.6 in | 271.7 | 1.887 | 1,753 |

18.7 in | 274.6 | 1.907 | 1,772 |

18.8 in | 277.6 | 1.928 | 1,791 |

18.9 in | 280.6 | 1.948 | 1,810 |