## 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 640 feet into kilometers we have to multiply 640 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

640 ft → L(km)

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

L(km) = 640 ft × 0.0003048 km

L(km) = 0.195072 km

The final result is:

640 ft → 0.195072 km

We conclude that 640 feet is equivalent to 0.195072 kilometers:

640 feet = 0.195072 kilometers

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 5.126312335958 × 640 feet.

Another way is saying that 640 feet is equal to 1 ÷ 5.126312335958 kilometers.

## Approximate result

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

640 ft ≅ 0.195 km

An alternative is also that one kilometer is approximately five point one two six times six hundred forty 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

feet (ft) kilometers (km)
641 feet 0.195 kilometers
642 feet 0.196 kilometers
643 feet 0.196 kilometers
644 feet 0.196 kilometers
645 feet 0.197 kilometers
646 feet 0.197 kilometers
647 feet 0.197 kilometers
648 feet 0.198 kilometers
649 feet 0.198 kilometers
650 feet 0.198 kilometers