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Unit Converter

Conversion formula

The conversion factor from miles per hour to knots is 0.8689762419014, which means that 1 mile per hour is equal to 0.8689762419014 knots:

1 mph = 0.8689762419014 kt

To convert 21.5 miles per hour into knots we have to multiply 21.5 by the conversion factor in order to get the velocity amount from miles per hour to knots. We can also form a simple proportion to calculate the result:

1 mph → 0.8689762419014 kt

21.5 mph → V(kt)

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

V(kt) = 21.5 mph × 0.8689762419014 kt

V(kt) = 18.68298920088 kt

The final result is:

21.5 mph → 18.68298920088 kt

We conclude that 21.5 miles per hour is equivalent to 18.68298920088 knots:

21.5 miles per hour = 18.68298920088 knots

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.053524625489421 × 21.5 miles per hour.

Another way is saying that 21.5 miles per hour is equal to 1 ÷ 0.053524625489421 knots.

Approximate result

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

21.5 mph ≅ 18.683 kt

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

Conversion table

miles per hour to knots chart

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

miles per hour (mph) knots (kt)
22.5 miles per hour 19.552 knots
23.5 miles per hour 20.421 knots
24.5 miles per hour 21.29 knots
25.5 miles per hour 22.159 knots
26.5 miles per hour 23.028 knots
27.5 miles per hour 23.897 knots
28.5 miles per hour 24.766 knots
29.5 miles per hour 25.635 knots
30.5 miles per hour 26.504 knots
31.5 miles per hour 27.373 knots