Divide the number of centimeters by 100,000 to convert to kilometers. For example, if you have 500,000 cm, divide 500,000 by 100,000 to get 5 km.
Multiply the number of centimeters by 0.00001 to convert to kilometers. Continuing with this example, multiplying 500,000 by 0.00001 to convert to 5 km.
Check your answer using an online centimeters-to-kilometers converter (see Resources). Enter the number of centimeters and press "Go!"