Kilometers to MilesFree online conversion calculator — instant results, no sign-up
Convert kilometers to miles and back.
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About the Kilometers to Miles
The Kilometers to Miles calculator converts a distance in kilometers into international statute miles. It also shows the reverse unit relationship, so you can see how miles correspond to kilometers. With the default input of 1 kilometer, the result is 0.621371 miles.
- Value in kilometers (kilometers)
- The distance to convert, expressed in kilometers, with a default value of 1.
Formula and method
m = k / 1.609344; reverse conversion: k = m × 1.609344. For k = 1, m ≈ 0.621371 miles; for m = 1, k = 1.609344 kilometers.
- kDistance in kilometers.
- mDistance in international statute miles.
Divide the entered kilometer value by 1.609344, the exact number of kilometers in one international statute mile. Round the displayed mile result to six decimal places, as in the default example. To convert in the reverse direction, multiply a mile value by 1.609344.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in kilometers1 kilometers
Results
- miles0.621371
- 1 kilometers =0.621371 miles
- 1 miles =1.609344 kilometers
How to use the Kilometers to Miles
- 1Enter the distance in the Value in kilometers (kilometers) field, or leave the default value of 1.
- 2Read the miles result calculated by dividing the kilometer value by 1.609344.
- 3For the default input, check that the result reads miles = 0.621371.
- 4Read the forward conversion row as 1 kilometer ≈ 0.621371 miles.
- 5Use the reverse relationship, 1 mile = 1.609344 kilometers, when converting a mile distance back to kilometers.
Reading your result
The 'miles = 0.621371' output is the converted value for the default kilometer input. The row '1 kilometers = = 0.621371 miles' repeats that forward conversion; its doubled equals sign is a display artifact, and the mile value is rounded. The row '1 miles = = 1.609344 kilometers' states the reverse unit relationship, not a conversion of the rounded 0.621371-mile result back to kilometers.
Limitations
This conversion uses international statute miles, not nautical miles or historical survey miles. The factor 1.609344 is exact, but a mile result displayed to six decimal places is rounded; converting that rounded result back may not reproduce the input exactly. The listed input accepts kilometers, so the reverse relationship does not by itself imply that there is a separate miles-entry field. Conversion preserves the accuracy of the original distance measurement; it does not improve it.
Common questions
Why does 1 kilometer display as 0.621371 miles?+
One international statute mile is exactly 1.609344 kilometers. Dividing 1 by 1.609344 and rounding to six decimal places gives 0.621371 miles.
How do I convert miles back to kilometers?+
Multiply the distance in miles by 1.609344. The reverse relationship shown by this calculator is 1 mile = 1.609344 kilometers.
Does this calculator convert kilometers to nautical miles?+
No. Its miles output uses international statute miles. Nautical miles are a different length unit and require a different conversion factor.
Why might converting the displayed miles back not give exactly 1 kilometer?+
The displayed default result, 0.621371 miles, has been rounded. Multiplying it by 1.609344 can therefore produce a value slightly different from 1 kilometer; keep the unrounded result for intermediate calculations.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.