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 8421 miles per hour into knots we have to multiply 8421 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

8421 mph → V_(kt)

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

V_(kt) = 8421 mph × 0.8689762419014 kt

V_(kt) = 7317.6489330517 kt

The final result is:

8421 mph → 7317.6489330517 kt

We conclude that 8421 miles per hour is equivalent to 7317.6489330517 knots:

8421 miles per hour = 7317.6489330517 knots

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.00013665591355214 × 8421 miles per hour.

Another way is saying that 8421 miles per hour is equal to 1 ÷ 0.00013665591355214 knots.

Approximate result

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

8421 mph ≅ 7317.649 kt

An alternative is also that one knot is approximately zero times eight thousand four hundred twenty-one 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