## Units of capacity and volume - United States customary units

The cubic inch, cubic foot and cubic yard are commonly used for measuring volume. In addition, there is one group of units for measuring volumes of liquids, and one for measuring volumes of dry material.

Other than the cubic foot, cubic inch and cubic yard, these units are differently sized from the units in the Imperial system, although the names of the units are similar. Also, while the U.S. has separate systems for measuring the volumes of liquids and dry material, the Imperial system has one set of units for both.

**Volume measures - USA**

U.S. customary units of volume:

U.S. fluid ounce, about 29.6 mLThe acre foot is often used in measuring the volume of water in a reservoir or an aquifer. It is the volume of water that would cover an area of one acre to a depth of one foot. It is equivalent to 43,560 cubic feet or exactly 1233.481 837 547 52 m�.

U.S. liquid pint = 16 fluid ounces, or about 473 mL

U.S. dry pint = 1/64 U.S. bushel, or about 551 mL (used for things such as blueberries)

U.S. liquid quart = 32 fluid ounces or two U.S. pints, or about 946 mL

U.S. dry quart = 1/32 U.S. bushel, or about 1.101 L

U.S. liquid gallon = 128 fluid ounces or four U.S. quarts, about 3.785 L

U.S. dry gallon = 1/8 U.S. bushel, or about 4.405 L

U.S. (dry level) bushel = 2150.42 cubic inches, or about 35.239 L

cubic inch = 16.387 064 in3

cubic foot = 1,728 in3 » 28.317 dm3

cubic yard = 27 ft3 » 0.7646 m3

cubic mile = 5,451,776,000 yd3 = 3,379,200 acre-feet » 4.168 km3

**Volume measures: cooking**

*Traditional cooking measures for volume also include:*

teaspoon = 1/6 U.S. fluid ounce (about 4.929 mL)

teaspoon = 1/6 Imperial fluid ounce (about 4.736 mL) (Canada)

teaspoon = 5 mL (metric)

tablespoon = 1/2 U.S. fluid ounce or 3 teaspoons (about 14.79 mL)

tablespoon = 1/2 Imperial fluid ounce or 3 teaspoons (about 14.21 mL) (Canada)

tablespoon = 15 mL or 3 teaspoons (metric)

tablespoon = 5 fluidrams (about 17.76 mL) (British)

cup = 8 U.S. fluid ounces or 1/2 U.S. liquid pint (about 237 mL)

cup = 8 Imperial fluid ounces or 1/2 fluid pint (about 227 mL) (Canada)

cup = 250 mL (metric)

Unit | Divisions | SI Units |
---|---|---|

1 cubic inch (cu in) | 16.387 064 mL | |

1 cubic foot (cu ft) | 1 728 cu in | 28.316 846 592 L |

1 cubic yard (cu yd) | 27 cu ft | 764.554 857 984 L |

Unit | Divisions | SI Units |
---|---|---|

1 minim (min) | 1 minim (min) | |

1 fluid dram (fl dr) | 60 min | 3.696 691 mL |

1 fluid ounce (fl oz) | 8 fl dr | 29.573 53 mL |

1 gill (gi) | 4 fl oz | 118.294 1 mL |

1 cup (cp) or (c) | 8 fl oz | 236.588 2 mL |

1 (liquid) pint (pt) | 4 gi / 16 fl oz | 473.176 5 mL |

1 (liquid) quart (qt) | 2 pt / 32 fl oz | 946.352 9 mL |

1 gallon (gal) | 4 qt /128 fl oz | 3.785 412 L |

Unit | Divisions | SI Units |
---|---|---|

1 (dry) pint (pt) | 33.6003125 cu in | 550.6105 mL |

1 (dry) quart (qt) | 2 pt | 1.101221 L |

1 (dry) gallon | 4 qt | 4.404884 L |

1 peck (pk) | 2 (dry) gallons | 8.809768 L |

1 bushel (bu) | 4 pk | 35.23907 L |

## Measures of volume - Imperial unit

Britain adopted a close approximation to the ale gallon known as the Imperial gallon. Space occupied by 10 lb of distilled water of density 0.998 859 g/ml weighed in air of density 0.001217 g/ml against weights of density 8.136 g/ml. This works out to exactly 4.545964591 l, or 277.420 in�.

**Wet Volume**

1 fluid ounce = 0.0284130625 l

1 gill = 5 oz. = 0.1420653125 l

1 pint = 4 gills = 20 oz. = 0.56826125 l

1 quart = 2 pints = 40 oz. = 1.1365225 l

1 gallon = 4 quarts = 8 pints = 160 oz. = 4.54609 l

**Dry Volume**

1 peck = 2 gal. = 9.092 18 l

1 kenning or bucket = 2 pecks = 4 gal. = 18.18436 l

1 bushel = 2 kennings = 4 pecks = 8 gal. = 36.36872 l

1 strike = 2 bushels = 16 gal. = 72.737 44 l

1 quarter or pail = 8 bushels = 64 gal. = 290.94976 l

1 chaldron = 4 quarters = 32 bushels = 256 gal. = 1163.79904 l

1 last = 10 quarters = 80 bushels = 640 gal. = 2909.4976 l

**Brewery Volume**

1 firkin = 9 gal. = 40.91481 l

1 kilderkin = 2 firkin = 18 gal. = 81.82962 l

1 barrel = 2 kilderkin = 4 firkin = 36 gal. = 163.65924 l

1 hogshead (of beer) = 3 kilderkin = 6 firkin = 54 gal. = 245.48886 l