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United States Units of Measurement Logo Picture
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US Units of Length
Unit Divisions SI Equivalent
Exact relationships shown boldface
1 inch (in) 25.4 mm
1 foot (ft) 12 in 0.3048 m
1 yard (yd) 3 ft 0.9144 m
1 mile (mi) 5,280 ft 1.609344 km
US Units of Area
Unit Divisions SI Equivalent
1 square inch (sq in) 645.16 mm²
1 square foot (sq ft) 144 sq in 0.09290304 m²
1 square yard (sq yd) 9 sq ft 0.83612736 m²
1 square mile (sq mi) 3,097,600 sq yd 2.589988110336 km²
US Units of Volume (cubic units of length)
Unit Divisions SI Equivalent
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
US Units of Liquid Volume
Unit Divisions SI Equivalent
1 fluid ounce (fl oz) 29.573 53 mL
1 cup (cp) or (c) 8 fl oz 236.588 2 mL
1 (liquid) pint (pt) 2 cp / 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
1 beer barrel (Bbl) 31 gal 117.347 8 L
1 oil barrel (bbl) 42 gal 158.987 3 L
US/Avoirdupois Weight
Unit Divisions SI Equivalent
1 grain (gr) 17000 lb 64.798 91 mg
1 dram (dr) 27+1132 gr 1.771 845 195 312 5 g
1 ounce (oz) 16 dr 28.349 523 125 g
1 pound (lb) 16 oz 453.592 37 g
1 hundredweight (cwt) 100 lb 45.359 237 kg
1 (short) ton 20 cwt 907.184 74 kg
US Cooking Measures
Unit Divisions SI Equivalent
1 teaspoon (tsp) 5 mL
1 tablespoon (tbsp) 3 tsp 15 mL
1 cup 16 tbsp 240 mL
1 stick (for butter) 4 oz 115 g