How Do I Change Km to Miles?

# How Do I Change Km to Miles?

Miles (mi) are Imperial or English units used to measure distance, and kilometers (km) are metric units used to measure distance. Some devices, such as many car speedometers, measure and display both, but when the conversion is not already done, knowing how to change kilometers to miles can be a helpful skill. If you know the rate, you can quickly estimate the conversion.

1. Understand the conversion rate

For every 1 mile, there are approximately 1.609 kilometers. Alternatively, you could think that each kilometer is 0.621 miles, (because 1/1.609 = 0.621).

2. Multiply by the rate

When converting units, use fractions to cancel out the unit you no longer want by putting it on the opposite side of the fraction. To turn kilometers into miles, multiply a given number of kilometers by either the fraction 0.621mi/km or the fraction 1mi/1.609km. For example, 100km * 0.621mi/km = 62.1mi, because the kilometers cancel. 85km * 0.621mi/km = 52.8mi