See the below image for the **Metric conversion using proportions** diagram. We can use ratios and proportions to convert both customary and metric units. Use the table below to convert from one unit to another within the same measurement system. Each relationship in the table can be described by two ratios.

If you want to convert from English to metric units or from metric to English units, there is a simple way to do this that uses only one formula for each type of conversion. When you multiply any number by 1, that number stays the same. For example, 36 1 = 36.

Write a proportion. Because 1 x 3 = 3, multiply 16 by 3. A weight of 3 pounds is equal to 48 ounces. A moderate amount of daily sodium consumption is 2,000 milligrams. What is this mass in grams ? Use a proportion to convert 2,000 milligrams to grams. Identify the ratio that compares the units involved.

## Metric conversion using proportions image