Customary Units

Customary systemThe customary system of measurement is defined as a set of weights and measures used for measuring length, weight, capacity, and temperature. Based on the English system of measurement, is also known as the U.S. Customary System.

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Customary Units for Length

The customary units to measure length and distances in the customary system are inches, feet, yards, and miles.

Customary Units for Measuring Length

InchesFeetYardsMiles

We can use the given chart for the conversion of one customary unit of length to another.

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Example: Convert 5 feet to inches.

1 foot = 12 inches

5 foot = 12 × 5 = 60 inches

The table given below shows the relation between customary units and standard metric units.

Customary Unit

Customary Equivalent

Standard Metric Equivalent

1 inch

2.54 centimeters

1 foot

12 inches

0.3048 meters

1 yard

3 feet

0.9144 meters

1 mile

1760 yards

1.609 344 kilometers

Customary Units for Weight

The U.S. customary units for measuring weight are ounces, pounds, and tons.

Customary Units for Measuring Weight
Ounces
Pound
Ton

We can convert the customary unit of weight by using the giving relations.

*

Example: How many ounces are there in 1 ton?

1 ton = 2000 pounds

1 pound = 16 ounces

So, 2000 pounds = 2000 × 16 = 32000 ounces

Customary Unit

Customary Equivalent

Standard Metric Equivalent

1 ounce

28.349523125 grams

1 pound

16 ounces

453.59237 grams

1 ton

2000 pounds

907.18474 kilograms

Customary Units for Capacity (Volume)

The U.S. customary capacity or volume measurement units are ounces, cups, pints, quarts, and gallons.

Customary Units for Measuring Capacity (Volume)

Fluid Ounce CupPintQuartGallon

Example: Convert 3 quarts to cups.

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1 quart = 2 pints

3 quarts = 6 pints

1 pint = 2 cups

6 pints = 6 × 2 = 12 cups

Customary Unit

Customary Equivalent

Standard Metric Equivalent

1 fluid ounce

2 tablespoons

29.5735295625 milliliters

1 cup

8 fluid ounces

236.5882365 milliliters

1 pint

2 cups

473.176473 milliliters

1 quart

2 pints

0.946352946 liters

1 gallon

4 quarts

3.785411784 liters

Customary Units for Temperature

The U.S. customary measurement unit for temperature is °Fahrenheit.

1 °C = 33.8 °F

Fun Facts

Customary system is called the International System of Units or the Modern Metric System.