Convert kilometers to miles

Precise decimal and fraction answers

The conversion in miles rounded to six significant decimal places is 1 km = 0.621371 mi. The precise fraction answer is ¹⁰⁰⁶/₁₆₁₉ mi.

Answer in feet and inches

1 km equals 3280 ft 10 ⁵/₆₄ in using feet, inches and fractional inches instead of decimals as is traditional in the imperial system. This calculation is accurate to the nearest 1/64th of an inch.

How many miles are in a kilometer?

There are 0.621 miles in one kilometer. A kilometer is 62.14% of a mile. A mile is 60.93% longer than one kilometer.

Kilometers to miles conversion factor and formulas

The conversion factor between kilometers and miles is 1.609. This represents the ratio of kilometers per one mile. To calculate the value in miles, we can either divide by the conversion factor or multiply by its inverse.

Division

To convert from kilometers to miles, divide kilometers by 1.609.
The formula is expressed as:
km ÷ 1.609 = mi

Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1.609 is 1/1.609 or 0.621. To convert from kilometers to miles, multiply kilometers by 0.621.
The formula is expressed as:
km × 0.621 = mi

About this conversion

Converting kilometers to miles is a conversion between units from separate unit systems - kilometers are metric (SI) defined units while miles are US Customary / UK Imperial .

About Kilometers

Within the SI (metric) system of measurement, the kilometer is officially defined as being equal to 1,000 meters. It is commonly used as measurement for geographic distances in similar circumstances where a mile would be used in the U.S. Internationally it is spelled 'kilometre' whereas the U.S. spells it 'kilometer'. The symbol for a kilometer is km however k is sometimes used.

About Miles

The mile is a measure of distance between two points used within the US Customary and British Imperial units of measure. It is customarily used to measure large geographical distances. The mile is officially defined as 5,280 feet, 1,760 yards or 1,609.344 meters. The abbreviation or for miles is 'mi' or sometimes 'm' as in miles per hour. The mile's origin stems from the Roman mile, which marked the distance the Roman army could march over 1,000 (mille) paces.

Reverse this conversion

Convert from miles to kilometers instead.

References and Citations

1. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)
2. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement