Customary Metric
Length
 inch - in foot - ft yard - yd mile - mi 1 ft = 12 in 1 yd = 36 in 1 yd = 3 ft 1 mi=63,360 in 1 mi = 5280 ft 1 mi=1760 yd The distance between the knuckles on your index finger is approximately 1 inch. Your notebook is approximately 1 foot tall. A baseball bat is approximately 1 yard long. Long distances are measured in miles. The distance a vehicle travels is measured in miles.
 centimeter -cm decimeter - dm meter - m kilometer - km 1 cm=10 mm 1 dm=100 mm 1 dm=10 cm 1 m= 1000 mm 1 m=100 cm 1 m=10dm 1 km=1,000,000 mm 1 km=100,000 cm 1 km=10,000 dm 1 km=1000 m A paperclip is approximately 1 centimeter wide. A crayon is approximately 1 decimeter long. The distance from the floor to the door knob is approximately 1 meter. The length of 6 city blocks is  approximately 1 kilometer long.
Weight
 ounce - oz pound - lb ton - T 1 lb = 16 oz 1 T = 32,000 oz 1 T = 2000 lb A slice a bread weighs about 1 ounce. A loaf of bread weighs about 1 pound. A car weighs about 1 ton.
 gram kilogram 1 kilogram = 1000 grams A packet of sugar weighs about 1 gram. A book weighs about 1 kilogram. A car weighs about 1000 kilograms.
Capacity
 cups - c pint - pt quarts - qt gallon - gal 1 pt = 2 c 1 qt = 4 c 1 qt = 2 pt 1 gal = 16 c 1 gal = 8 pt 1 gal = 4 qt A small cup of coffee holds approximately 1 cup. A tall glass of lemonade or a bowl of soup holds approximately 1 pint. Oil comes in a quart-sized container. A large container of milk comes in a 1 gallon container.

 milliliter - ml liter - l 1 liter = 1000 milliliters Ten drops  from a medicine dropper is approximately 1 milliliter. A bottle of cola is one liter. A very large bottle holds 3 liters.