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 21.5 knots into miles per hour we have to multiply 21.5 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

21.5 kt → V_(mph)

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

V_(mph) = 21.5 kt × 1.1507794480225 mph

V_(mph) = 24.741758132485 mph

The final result is:

21.5 kt → 24.741758132485 mph

We conclude that 21.5 knots is equivalent to 24.741758132485 miles per hour:

21.5 knots = 24.741758132485 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 0.040417499623321 × 21.5 knots.

Another way is saying that 21.5 knots is equal to 1 ÷ 0.040417499623321 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 point five knots is approximately twenty-four point seven four two miles per hour:

21.5 kt ≅ 24.742 mph

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