How to Convert Kilometers to Miles

The mile is an international unit of measurement commonly used in the United States to determine the distance between two points. The kilometer (km) is also used for the same purpose, but this is a unit of length. Converting from miles to kilometers and vice versa is a fairly simple problem.

Table of Contents

Convert from kilometers to miles

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Memorize the formula to convert kilometers to miles. 1 km is equal to 0.621371 miles (usually rounded to 0.62). ^{[1] X Research Source} 1 mile is equal to 1.609344 km.

So to convert kilometers to miles, we just need to multiply the number of kilometers by 0.62137. ^{[2] X Research Source}
For example, we have 5 km. People often prefer to convert in this direction because they want to know the mileage after going 5 km. According to the formula, we have: 5 X 0.62137 = 3.1 miles.
You can also divide km by km/mile (1 mile = 1.609 km as above after rounding). We have: 5 km : 1.609 km/mile = 3.1 miles. ^{[3] X Research Sources}

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Convert kilometers to nautical miles. The mile is usually a ground-based unit of measurement. However, there will be times when you need to convert to knots.

The conversion to nautical miles will be different as follows: 1 km = 0.5399568035 nautical miles.
Nautical miles are based on the circumference of the earth and are used in maritime and air travel.

By online tool

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Use a conversion chart or an online calculator. The chart lists the equivalent kilometers and miles. The calculator allows you to enter the number of kilometers to get the mileage. ^{[4] X Research Sources}

For example, the chart will show 11 km or 6.84 miles. However, 11 miles is equal to 17.7 kilometers.
If you are familiar with Microsoft Excel, you can also use Excel formulas and conversions. To convert kilometers to miles in Excel, the formula would be CONVERT(x,”y”,”z”). Where “y” is the original unit of measure, “x” is the quantity of that unit, and “z” is the unit of measure you want to convert to.

By mental calculation

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Using mental arithmetic since ancient times. It would be difficult for most people to multiply any number by 0.62137119. Here’s how you can do mental math quickly.

For example, we have 144 km. Take 144 : 2 = 72. Continue to take 72 : 4 = 18.
Now, add the two numbers you just calculated (1/2 and 1/4 of the km) together to get: 72 + 18 = 90. This is the answer. ^{[5] X Research Sources}

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Use Fibonacci numbers to perform the transformation. This method is not very popular, but it works. The Fibonacci sequence is a series of numbers where each following number is equal to the sum of the previous two. ^{[6] X Research Sources}

Start with two consecutive Fibonacci numbers. In this example it will be 5 and 8. We have 8 km which is equivalent to 5 miles. To convert backwards, you simply read the result in the opposite direction, i.e. 5 miles is approximately equal to 8 kilometers.
This method is only applicable when estimating. For example, with two consecutive Fibonacci numbers of 21 and 34, you will immediately have 34 km equivalent to 21 miles and vice versa, but the correct answer is 33.79 km.
To convert a non-Fibonacci number, you can parse the original number into the sum of the Fibonacci numbers and then perform the conversion with each Fibonacci number. For example, 100 miles is equal to how many kilometers? The number 100 can be the sum of the following Fibonacci numbers: 89 + 8 + 3. The next Fibonacci number of 89 is 144, after 8 is 13 and after 3 is 5. So, 100 miles is equivalent to the sum of 144 + 13 + 5 = 162 km.

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Find the conversion to another kilometer. You can convert to units other than miles. There are other ways to convert kilometers.

1 km = 39370.07874 inches = 3280.839895 feet = 1093.613298 yards = 100000 cm.
1 km = 1000 meters.

Steps

Convert from kilometers to miles

By online tool

By mental calculation

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