# Miles (mi) and Kilometers (km) Conversion Calculator

An online miles and kilometers conversion calculator is presented. Problems involving convertion of miles and kilometers are also included.

Abbreviations to miles and kilometers.

1 kilometer may be written as 1 km

1 mile may be written as 1 mi

## Conversion Formula of Miles into Kilometers [1]

1 mile = 1.609344 kilometers.

1 kilometer = (1/1.609344) miles = 0.62137119223 miles

## Examples of Conversion

Example 1 - Convert a 22.4 miles to km and round answer to the nearest km

22.4 miles = 22.4 × 1.609344 km = 36.0493056 km

Round to the nearest km is similar to rounding to the nearest unit.

22.4 miles = 36 km

Example 2 - Convert a 17,01 km into miles and round answer to the nearest tenth of a mile

17,01 km = (17.01 /1.609344) miles = 10.56952398 km

Round to the nearest tenth of a mile is similar to rounding to one decimal place.

17,01 km = 10.6 mi

## Use of the Converter

Enter the number of miles (mi) or kilometers (Km) to be converted and convert.

## Problems Involving miles to kilometers Conversions

Problem 1

The fuel-efficiency of a car is 54.8 mpg (miles per gallon). What is the fuel-efficiency of this car in kilometer per gallon (km/g)? Round the results to 2 decimal places.

Solution

Convert 54.8 miles into km

54.8 mi = 54.8 × 1.609344 km = 88.1920512 km

The fuel-efficiency of the car rounded to two decimal places is

88.19 km/g

Problem 2

The speed limit in a highway is 110 km per hour (km/hr). What is the speed limit in miles per hour (mph) rounded to the nearest unit?

Solution

Convert 110 km into miles

110 km = ( 110/1.609344 ) mi = 68.3508311461 mi

The speed limit in miles per hour (mph) rounded to the nearest unit is

68 mph

Problem 3

How long does it take a car to cover a distance of 210 miles at the average speed of 90 km/hr? Write the answer as hours/minutes to the nearest minute.

Solution

Since the speed of the car is given in km/hr, we first need to convert the distance in km

210 mi = 210 × 1.609344 km = 337.96224 km

We now use the formula

Time = Distance / speed

Time = (337.96224 km) / (90 km/hr) = 3.755136 hr

Time = 3 hours + 0.755136*60 minutes = 3 hours + 45.30816 minutes

Round 45.30816 minutes to the nearest minute

Time = 3 hours / 45 minutes

### More References and links

- www.nist.gove.pdf
- Online Calculators
- Units Conversion and Calculators
- Geometry Calculators