How to Convert Miles to Kilometers

Direct answer

Multiply the distance in miles by 1.609344.

Kilometers = miles x 1.609344

For example, 10 miles converts as follows:

10 x 1.609344 = 16.09344

10 miles = 16.09344 kilometers

Enter another distance into the Miles to Kilometers Converter.

Step-by-step conversion process

Write down the complete mile distance. Preserve any decimal or fractional part.
Multiply the mile value by 1.609344.
Keep the complete result during calculation.
Round the kilometer value only when needed.
Label the final answer in kilometers.

Why 1.609344 is used

One international mile is defined as exactly 5,280 international feet. One international foot equals exactly 0.3048 meter.

5,280 x 0.3048 = 1,609.344 meters

1,609.344 meters / 1,000 = 1.609344 kilometers

1 mile = exactly 1.609344 kilometers

1 mile 5,280 feet

1 mile 1,609.344 meters

1 mile 1.609344 kilometers

Convert whole miles to kilometers

Convert 1 mile

1 x 1.609344 = 1.609344

1 mile = 1.609344 kilometers

Convert 5 miles

5 x 1.609344 = 8.04672

5 miles = 8.04672 kilometers

Convert 20 miles

20 x 1.609344 = 32.18688

20 miles = 32.18688 kilometers

Convert 100 miles

100 x 1.609344 = 160.9344

100 miles = 160.9344 kilometers

Convert decimal miles to kilometers

Multiply the complete decimal distance by 1.609344. Do not remove the decimal portion before converting.

Convert 2.5 miles

2.5 x 1.609344 = 4.02336

2.5 miles = 4.02336 kilometers

Convert 3.1 miles

3.1 x 1.609344 = 4.9889664

3.1 miles = 4.9889664 kilometers

Convert 6.2 miles

6.2 x 1.609344 = 9.9779328

6.2 miles is approximately 9.97793 kilometers

Convert 13.1 miles

13.1 x 1.609344 = 21.0824064

13.1 miles is approximately 21.08241 kilometers

Convert fractional miles to kilometers

Divide the numerator by the denominator to calculate decimal miles, then multiply the result by 1.609344.

Convert half a mile

1 / 2 = 0.5 mile

0.5 x 1.609344 = 0.804672

1/2 mile = 0.804672 kilometer

Convert three-quarter mile

3 / 4 = 0.75 mile

0.75 x 1.609344 = 1.207008

3/4 mile = 1.207008 kilometers

Convert 2 1/2 miles

2 1/2 miles = 2.5 miles

2.5 x 1.609344 = 4.02336

2 1/2 miles = 4.02336 kilometers

Common miles-to-kilometers conversions

Miles	Kilometers
0.25 mi	0.402336 km
0.5 mi	0.804672 km
0.75 mi	1.207008 km
1 mi	1.609344 km
2 mi	3.218688 km
3 mi	4.828032 km
5 mi	8.04672 km
10 mi	16.09344 km
20 mi	32.18688 km
25 mi	40.2336 km
50 mi	80.4672 km
100 mi	160.9344 km
250 mi	402.336 km
500 mi	804.672 km

How to estimate miles in kilometers

Multiply miles by 1.6 for a quick mental estimate.

50 miles x 1.6 = 80 kilometers

Exact result: 80.4672 kilometers

The shortcut slightly underestimates the true result because 1.6 is smaller than 1.609344.

Where this conversion is used

driving and road distances;
road trips and travel planning;
running and race distances;
walking and hiking routes;
cycling distances;
geographic comparisons;
vehicle range information;
delivery and transport distances;
map and navigation measurements.

Road distance and straight-line distance

Converting miles to kilometers does not change the kind of distance being measured. A road route and a straight-line measurement may have different values even when both conversions are correct.

Road distance Distance along roads

Route distance Distance along a chosen path

Direct distance Point-to-point distance

How much should the result be rounded?

Keep the complete result until the final step. Choose a rounding level that matches the original distance and its intended use.

13.1 miles = 21.0824064 kilometers

Rounded to three decimals: 21.082 kilometers

Rounded to two decimals: 21.08 kilometers

Rounded to one decimal: 21.1 kilometers

Miles-to-kilometers mistakes to avoid

Dividing by 1.609344

Dividing by 1.609344 converts kilometers to miles. Miles are converted to kilometers by multiplying.

Using 1.6 as an exact factor

The value 1.6 is suitable for estimation. The exact factor is 1.609344.

Dropping a decimal or fraction

Convert the complete original distance.

Confusing kilometers with meters

One kilometer contains 1,000 meters.

Assuming conversion corrects route data

Unit conversion cannot correct inaccurate GPS, map, or route data.

Related miles-to-kilometers guides

Reverse the conversion

Use the Kilometers to Miles Converter to convert a kilometer distance back into miles.

Frequently asked questions

How do you convert miles to kilometers?

Multiply the complete mile distance by exactly 1.609344.

How many kilometers are in one mile?

One international mile equals exactly 1.609344 kilometers.

How many kilometers are in 10 miles?

Ten miles equal exactly 16.09344 kilometers.

Can fractional miles be converted?

Yes. Convert the fraction to decimal miles and multiply by 1.609344.