Conversion formula

The conversion factor from feet to kilometers is 0.0003048, which means that 1 foot is equal to 0.0003048 kilometers:

1 ft = 0.0003048 km

To convert 688 feet into kilometers we have to multiply 688 by the conversion factor in order to get the length amount from feet to kilometers. We can also form a simple proportion to calculate the result:

1 ft → 0.0003048 km

688 ft → L_(km)

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

L_(km) = 688 ft × 0.0003048 km

L_(km) = 0.2097024 km

The final result is:

688 ft → 0.2097024 km

We conclude that 688 feet is equivalent to 0.2097024 kilometers:

688 feet = 0.2097024 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 4.7686626381005 × 688 feet.

Another way is saying that 688 feet is equal to 1 ÷ 4.7686626381005 kilometers.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred eighty-eight feet is approximately zero point two one kilometers:

688 ft ≅ 0.21 km

An alternative is also that one kilometer is approximately four point seven six nine times six hundred eighty-eight feet.

Conversion table

feet to kilometers chart

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