Customary 
Metric 
Length 1 foot (ft) = 12 inches (in.) 1 yard (yd) = 36 in. 1 yd = 3 ft 1 mile (mi) = 5,280 ft 1 mi = 1,760 yd 
Length 1 centimeter (cm) = 10 millimeters (mm) 1 meter (m) = 100 cm 1 kilometer (km) = 1,000 m 1 mm = 0.001 m 
Area 1 square foot (ft^{2}) = 144 square inches (in.^{2}) 1 square yard (yd^{2}) = 9 ft^{2} 1 square mile (mi^{2}) = 640 acres 
Area 1 square centimeter (cm^{2}) = 100 square millimeters (mm^{2}) 1 square meter (m^{2}) = 10,000 cm^{2} 
Volume 1 cubic foot (ft^{3}) = 1,728 cubic inches (in.^{3}) 1 cubic yard (yd^{3}) = 27 ft^{3} 
Volume 1 cubic centimeter (cm^{3}) = 1,000 cubic millimeters (mm^{3}) 1 cubic meter (m^{3}) = 1,000,000 cm^{3} 
Mass 1 pound (lb) = 16 ounces (oz) 1 ton (t) = 2,000 lb 
Mass 1 gram (g) = 1,000 milligrams (mg) 1 kilogram (kg) = 1,000 g 
Capacity 1 cup (c) = 8 fluid ounces (fl oz) 1 pint (pt) = 2 c 1 quart (qt) = 2 pt 1 gallon (gal) = 4 qt 
Capacity 1 liter (L) = 1,000 milliliters (mL) 1000 liters = 1 kiloliter (kL) 
Customary Units and Metric Units 

Length 
1 in. = 2.54 cm 1 mi ≈ 1.61 km 1 ft ≈ 0.3 m 
Capacity 
1 qt ≈ 0.94 L 
Weight and Mass 
1 oz ≈ 28.3 g 1 lb ≈ 0.45 kg 