The U.S. customary system of measurement is used throughout the United States, although the metric system is being phased in as well. You should be familiar with the following basic measurements of the U.S. customary system:
Length
12 inches (in) = 1 foot (ft)
3 feet = 1 yard (yd)
36 inches = 1 yard
1,760 yards = 1 mile (mi)
5,280 feet = 1 mile
Area
144 square inches (sq in) = 1 square foot (sq ft)
9 square feet = 1 square yard (sq yd)
Weight
16 ounces (oz) = 1 pound (lb)
2000 pounds = 1 ton (T)
Capacity
2 cups = 1 pint (pt)
2 pints = 1 quart (qt)
4 quarts = 1 gallon (gal)
4 pecks = 1 bushel
Time
365 days = 1 year
52 weeks = 1 year
10 years = 1 decade
100 years = 1 century