Customary Units in The United States - Units of Capacity and Volume - Fluid Volume

Fluid Volume

Liquid volume
Most common measures shown in italic font

Exact conversions in bold font

Unit Divisions SI Equivalent
1 minim (min) ~ 1 drop or 0.95 grain of water 61.611519922 μL
1 US fluid dram (fl dr) 60 min 3.696691195 mL
1 teaspoon (tsp) 80 min 4.928921594 mL
1 tablespoon (Tbsp) 3 tsp or 4 fl dr 14.786764781 mL
1 US fluid ounce (fl oz) 2 Tbsp or 1.0408 oz av of water 29.573529563 mL
1 jigger (jig) 3 Tbsp 44.360294344 mL
1 US gill (gi) 4 fl oz 118.29411825 mL
1 US cup (cp) 2 gi or 8 fl oz 236.5882365 mL
1 (liquid) US pint (pt) 2 cp or 16.65 oz av of water 473.176473 mL
1 (liquid) US quart (qt) 2 pt 0.946352946 L
1 (liquid) US gallon (gal) 4 qt or 231 cu in 3.785411784 L
1 (liquid) barrel (bbl) 31.5 gal or 1⁄2 hogshead 119.240471196 L
1 oil barrel (bbl) 42 gal or 2⁄3 hogshead 158.987294928 L
1 hogshead 63 gal or 8.421875 cu ft
or 524.7 lb of water
238.480942392 L

One fluid ounce is 1⁄16 of a U.S. pint, 1⁄32 of a U.S. quart, and 1⁄128 of a U.S. gallon. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, but in the U.S. it is defined as 1⁄128 of a U.S. gallon. Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois.

The saying "a pint's a pound the world around" refers to 16 US fluid ounces of water weighing approximately (about 4% more than) one pound avoirdupois. An imperial pint of water weighs a pound and a quarter.

There are varying standards for barrel for some specific commodities, including 31 gal for beer, 40 gal for whiskey or kerosene, and 42 gal for petroleum. The general standard for liquids is 31.5 gal or half a hogshead. The common 55 gallon size of drum for storing and transporting various products and wastes is sometimes confused with a barrel, though it is not a standard measure.

In the United States, single servings of beverages are usually measured in fluid ounces. Milk is usually sold in half pints (8 fluid ounces), pints, quarts, half gallons, and gallons. Water volume for sinks, bathtubs, ponds, swimming pools, etc., is usually stated in gallons or cubic feet. Quantities of gases are usually given in cubic feet (at one atmosphere).

Minims, drams and gill are rarely used currently.

Read more about this topic:  Customary Units In The United States, Units of Capacity and Volume

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