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

1. www.nist.gove.pdf
2. Online Calculators
3. Units Conversion and Calculators
4. Geometry Calculators