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)	1⁄7000 lb	64.798 91 mg
1 dram (dr)	27+11⁄32 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