## 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 40 knots into miles per hour we have to multiply 40 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

40 kt → V(mph)

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

V(mph) = 40 kt × 1.1507794480225 mph

V(mph) = 46.031177920902 mph

The final result is:

40 kt → 46.031177920902 mph

We conclude that 40 knots is equivalent to 46.031177920902 miles per hour:

40 knots = 46.031177920902 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 0.021724406047535 × 40 knots.

Another way is saying that 40 knots is equal to 1 ÷ 0.021724406047535 miles per hour.

## Approximate result

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

40 kt ≅ 46.031 mph

An alternative is also that one mile per hour is approximately zero point zero two two times forty 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)
41 knots 47.182 miles per hour
42 knots 48.333 miles per hour
43 knots 49.484 miles per hour
44 knots 50.634 miles per hour
45 knots 51.785 miles per hour
46 knots 52.936 miles per hour
47 knots 54.087 miles per hour
48 knots 55.237 miles per hour
49 knots 56.388 miles per hour
50 knots 57.539 miles per hour