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A mile is an imperial unit of measurement commonly used in the United States to determine the distance between two locations. A kilometer is used to measure the same thing but is a metric unit of length. It’s a fairly easy mathematical equation to convert kilometers to miles, or vice versa.
Steps
Kilometers to Miles Converter
Method 1
Method 1 of 3:Converting Kilometers to Miles

1Master the formula for converting kilometers to miles. 1 kilometer is equal to 0.621371 miles (often shortened to .62).^{[1] X Research source }1 mile is equal to 1.609344 kilometers.
 Thus, to convert kilometers to miles, simply multiply the number of kilometers by 0.62137.^{[2] X Research source }
 For example, let's say you start with 5 kilometers. People are often interested in this conversion because they want to know how many miles are in a 5K run. The formula is 5 X 0.62137= 3.1 miles.
 You could also divide the number of kilometers by the number of kilometers per mile, which is the abovementioned 1.609 kilometers (rounded off for simplicity). For example, 5 kilometers divided by 1.609 kilometers per mile = 3.1 miles.^{[3] X Research source }

2Convert kilometers to nautical miles. Regular miles are a landbased unit of measurement. However, perhaps you want to know the conversion for nautical miles instead.
 The conversion for nautical miles is different: Every kilometer is = to 0.5399568035 nautical miles.
 Nautical miles are based on the earth's circumference and is used for air and sea travel.
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Method 2
Method 2 of 3:Using Online Tools to Convert Kilometers to Miles

1Use a conversion chart or online calculator. The charts list the number of kilometers alongside the equivalent miles. The calculators allow you to plug in the number of kilometers to get the number of miles. ^{[4] X Research source }
 For example, a chart would show that 11 kilometers is equal to 6.84 miles. However, 11 miles is equal to 17.7 kilometers.
 If you know how to use Microsoft Excel, you could also use an Excel formula to do the conversion. To convert kilometers to miles in Excel, the formula is CONVERT(x,"y","z"). In the formula, "y" is the original unit of measurement, "x" is the quantity of that unit, and "z" is the unit of measurement you want to convert to.
Method 3
Method 3 of 3:Using Estimation to Convert Kilometers to Miles

1Use an old trick to do the calculation. It’s too hard for most people to multiply any number by 0.62137119. There is a way you can do the calculation in your head.
 Let’s say the number of kilometers is 144. Halve it. That gets you 72. Then take a quarter of the half. That’s 18.
 Now, add the two together, the half and the quarter: 72 plus 18 in this case. You get 90. That’s the answer.^{[5] X Research source }

2Use Fibonacci numbers to do the conversion. This one's unusual, but it works. These numbers are a series of numbers in which each subsequent number is the sum of the two before.^{[6] X Research source }
 Start with two consecutive Fibonacci numbers. For example, the numbers 5 and 8. There are 8 kilometers in 5 miles. To convert back, read the result in the other direction, as there are 5 miles in 8 km.
 This works as an estimate only. For example, take the consecutive Fibonacci numbers 21 and 34. This would tell you there are 34 kilometers in 21 miles and vice versa, when the exact answer is 33.79 kilometers.
 In order to convert a number that isn't a Fibonacci number, express the original number as a sum of Fibonacci numbers and do the conversion for each Fibonacci number separately. Say you want to convert 100 miles to kilometers. Number 100 could be a sum of Fibonacci numbers 89 + 8 + 3. The Fibonacci number following 89 is 144, the Fibonacci number following 8 is 13 and Fibonacci number following 3 is 5. So add 144 + 13 + 5 = 162 kilometers in 100 miles.

3Find other conversions for kilometers. Perhaps you don't want to stop with miles. There are many other conversions for kilometers.
 Every kilometer is equal to 39,370.07874 inches, 3,280.839895 feet,1,093.613298 yards, and 100,000 centimeters.
 Every kilometer is equal to 1,000 meters.
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Community Q&A

QuestionWhere are miles used?Community AnswerOnly in the United Kingdom and United States. The rest of the world uses kilometers.

QuestionHow many miles in are 108 kilometers?DonaganTop Answerer(108 km)(0.621371 mi/km) = 67.108 miles.

QuestionWhy is it that it is only USA and UK that do make use of miles instead of kilometers?DonaganTop AnswererMany centuries ago the Roman Empire introduced the mile into the UK, and they've simply stuck with it. From its beginning, the US adopted the British mile.

QuestionHow many meters are there in a kilometer?Community Answer1 kilometer=1,000 meters.

QuestionWe are told 5 miles is approximately 8 km. How do I convert 72 km to miles?DonaganTop AnswererYou want to know how many groups of 8 km there are in a distance of 72 km. So you divide 8 into 72. That's 9. So there are 9 groups of 8 km in 72 km, and each group consists of 5 miles. 9 x 5 = 45 miles.

QuestionHow do I convert kilometers to feet?DonaganTop AnswererMultiply kilometers by 3,280.84.

QuestionHow do I convert miles to feet in the US customary system?DonaganTop AnswererMultiply miles by 5,280.

Question60 miles = how many kilometers, showing how to calculate?DonaganTop AnswererOne mile equals 1.609 kilometers. Multiply 60 by 1.609. That's 96.56 kilometers.

QuestionThe road is 15 kilometers long. If the crew worked for 2 6/7 days, how many kilometers of road did they build each day?DonaganTop AnswererDivide 15 by 2 6/7: 15 ÷ 2 6/7 = 15 ÷ 20/7 = (15)(7/20) = 105/20 = 5¼ kilometers.

QuestionHow many kilometers in 12 miles?DonaganTop AnswererThere are 1.61 kilometers in a mile. So 12 miles equal (12)(1.61) = 19.32 kilometers.
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Tips
References
 ↑ http://www.calculatorpro.com/calculator/kilometerstomilescalculator/
 ↑ http://www.checkyourmath.com/convert/length/miles_km.php
 ↑ http://www.convertunits.com/from/miles/to/km
 ↑ http://www.metricconversions.org/length/kilometerstomilestable.htm
 ↑ http://www.thecalculatorsite.com/articles/units/convertkilometerstomiles.php
 ↑ http://www.catonmat.net/blog/usingfibonaccinumberstoconvertfrommilestokilometers/
About This Article
To convert kilometers to miles, multiply the number of kilometers by 0.621371. To get an approximation, you can shorten the number to 0.62. To convert kilometers to nautical miles, multiply the number of kilometers by 0.5399568035. If you want to learn how to estimate your conversion to make it simpler, keep reading the article!