## Conversion formula

The conversion factor from feet per second to knots is 0.59248380129641, which means that 1 foot per second is equal to 0.59248380129641 knots:

1 ft/s = 0.59248380129641 kt

To convert 640 feet per second into knots we have to multiply 640 by the conversion factor in order to get the velocity amount from feet per second to knots. We can also form a simple proportion to calculate the result:

1 ft/s → 0.59248380129641 kt

640 ft/s → V(kt)

Solve the above proportion to obtain the velocity V in knots:

V(kt) = 640 ft/s × 0.59248380129641 kt

V(kt) = 379.1896328297 kt

The final result is:

640 ft/s → 379.1896328297 kt

We conclude that 640 feet per second is equivalent to 379.1896328297 knots:

640 feet per second = 379.1896328297 knots

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.0026372029017183 × 640 feet per second.

Another way is saying that 640 feet per second is equal to 1 ÷ 0.0026372029017183 knots.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty feet per second is approximately three hundred seventy-nine point one nine knots:

640 ft/s ≅ 379.19 kt

An alternative is also that one knot is approximately zero point zero zero three times six hundred forty feet per second.

## Conversion table

### feet per second to knots chart

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

feet per second (ft/s) knots (kt)
641 feet per second 379.782 knots
642 feet per second 380.375 knots
643 feet per second 380.967 knots
644 feet per second 381.56 knots
645 feet per second 382.152 knots
646 feet per second 382.745 knots
647 feet per second 383.337 knots
648 feet per second 383.93 knots
649 feet per second 384.522 knots
650 feet per second 385.114 knots