## Conversion formula

The conversion factor from knots to miles per hour is 1.1507794480225, which means that 1 knot is equal to 1.1507794480225 miles per hour:

1 kt = 1.1507794480225 mph

To convert 21 knots into miles per hour we have to multiply 21 by the conversion factor in order to get the velocity amount from knots to miles per hour. We can also form a simple proportion to calculate the result:

1 kt → 1.1507794480225 mph

21 kt → V(mph)

Solve the above proportion to obtain the velocity V in miles per hour:

V(mph) = 21 kt × 1.1507794480225 mph

V(mph) = 24.166368408474 mph

The final result is:

21 kt → 24.166368408474 mph

We conclude that 21 knots is equivalent to 24.166368408474 miles per hour:

21 knots = 24.166368408474 miles per hour

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 mile per hour is equal to 0.041379821042924 × 21 knots.

Another way is saying that 21 knots is equal to 1 ÷ 0.041379821042924 miles per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one knots is approximately twenty-four point one six six miles per hour:

21 kt ≅ 24.166 mph

An alternative is also that one mile per hour is approximately zero point zero four one times twenty-one knots.

## Conversion table

### knots to miles per hour chart

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

knots (kt) miles per hour (mph)
22 knots 25.317 miles per hour
23 knots 26.468 miles per hour
24 knots 27.619 miles per hour
25 knots 28.769 miles per hour
26 knots 29.92 miles per hour
27 knots 31.071 miles per hour
28 knots 32.222 miles per hour
29 knots 33.373 miles per hour
30 knots 34.523 miles per hour
31 knots 35.674 miles per hour