A mile is almost 61% longer than a kilometer. A kilometer is only about 62% of a mile.
http://wiki.answers.com/Q/Which_is_bigger_mile_or_...

A mile is bigger. 1 kilometer = 0.621371192 mile. ChaCha on!
http://www.chacha.com/question/whichisbiggerak...

1. Calculate the number of miles multiplied by 1.609344 kilometers per mile to convert to kilometers. For example, if you drive 50 miles, multiply 50 by 1.609344 to get 80.47 kilometers
http://www.ehow.com/how_8120473_changemilekilome...

1 Determine the value in miles (represented by "mi" in the formula) you want to convert to kilometers and insert in into the blank space below. ____ mi * 63360 in 1 mi
http://www.wikihow.com/ConvertMilestoKilometers
