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 3.9 miles per hour into knots we have to multiply 3.9 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

3.9 mph → V_(kt)

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

V_(kt) = 3.9 mph × 0.8689762419014 kt

V_(kt) = 3.3890073434155 kt

The final result is:

3.9 mph → 3.3890073434155 kt

We conclude that 3.9 miles per hour is equivalent to 3.3890073434155 knots:

3.9 miles per hour = 3.3890073434155 knots

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.29507165333911 × 3.9 miles per hour.

Another way is saying that 3.9 miles per hour is equal to 1 ÷ 0.29507165333911 knots.

Approximate result

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

3.9 mph ≅ 3.389 kt

An alternative is also that one knot is approximately zero point two nine five times three point nine 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