An online miles and kilometers conversion calculator is presented along with conversion formulas, examples, and practical word problems.
Common abbreviations:
By international agreement:
\[ 1 \text{ mile} = 1.609344 \text{ kilometers} \] \[ 1 \text{ kilometer} = \left(\frac{1}{1.609344}\right) \text{ miles} \approx 0.62137119223 \text{ miles} \]Reference: NIST Reference Guidelines
Convert \( 22.4 \, \text{miles} \) to km and round the answer to the nearest km.
Rounding to the nearest km (nearest unit):
\[ 36 \, \text{km} \]Convert \( 17.01 \, \text{km} \) into miles and round the answer to the nearest tenth of a mile.
Rounding to the nearest tenth of a mile (one decimal place):
\[ 10.6 \, \text{mi} \]Enter the number of miles (mi) or kilometers (km) to be converted and calculate.
The fuel efficiency of a car is \( 54.8 \, \text{mpg} \) (miles per gallon). What is the fuel efficiency of this car in kilometers per gallon (km/g)? Round the results to 2 decimal places.
Convert \( 54.8 \, \text{miles} \) into km:
\[ 54.8 \, \text{mi} = 54.8 \times 1.609344 \, \text{km} = 88.1920512 \, \text{km} \]Rounding to two decimal places gives:
\[ 88.19 \, \text{km/g} \]The speed limit on a highway is \( 110 \, \text{km/hr} \). What is the speed limit in miles per hour (mph) rounded to the nearest unit?
Convert \( 110 \, \text{km} \) into miles:
\[ 110 \, \text{km} = \left(\frac{110}{1.609344}\right) \text{mi} \approx 68.350831 \, \text{mi} \]Rounding to the nearest unit gives:
\[ 68 \, \text{mph} \]How long does it take a car to cover a distance of \( 210 \, \text{miles} \) at the average speed of \( 90 \, \text{km/hr} \)? Write the answer in hours and minutes to the nearest minute.
Since the speed is given in km/hr, convert the distance into kilometers first:
\[ 210 \, \text{mi} = 210 \times 1.609344 \, \text{km} = 337.96224 \, \text{km} \]Using the formula \( \text{Time} = \dfrac{\text{Distance}}{\text{Speed}} \):
\[ \text{Time} = \dfrac{337.96224 \, \text{km}}{90 \, \text{km/hr}} \approx 3.755136 \, \text{hr} \]Convert the decimal hour part into minutes:
\[ 0.755136 \times 60 \, \text{minutes} \approx 45.30816 \, \text{minutes} \]Rounding to the nearest minute:
\[ 3 \text{ hours and } 45 \text{ minutes} \]