Conversion formula

The conversion factor from kilometers to meters is 1000, which means that 1 kilometer is equal to 1000 meters:

1 km = 1000 m

To convert 21 kilometers into meters we have to multiply 21 by the conversion factor in order to get the length amount from kilometers to meters. We can also form a simple proportion to calculate the result:

1 km → 1000 m

21 km → L_(m)

Solve the above proportion to obtain the length L in meters:

L_(m) = 21 km × 1000 m

L_(m) = 21000 m

The final result is:

21 km → 21000 m

We conclude that 21 kilometers is equivalent to 21000 meters:

21 kilometers = 21000 meters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 meter is equal to 4.7619047619048E-5 × 21 kilometers.

Another way is saying that 21 kilometers is equal to 1 ÷ 4.7619047619048E-5 meters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one kilometers is approximately twenty-one thousand meters:

21 km ≅ 21000 m

An alternative is also that one meter is approximately zero times twenty-one kilometers.

Conversion table

kilometers to meters chart

For quick reference purposes, below is the conversion table you can use to convert from kilometers to meters