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 645 knots into miles per hour we have to multiply 645 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

645 kt → V_(mph)

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

V_(mph) = 645 kt × 1.1507794480225 mph

V_(mph) = 742.25274397454 mph

The final result is:

645 kt → 742.25274397454 mph

We conclude that 645 knots is equivalent to 742.25274397454 miles per hour:

645 knots = 742.25274397454 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 0.001347249987444 × 645 knots.

Another way is saying that 645 knots is equal to 1 ÷ 0.001347249987444 miles per hour.

Approximate result

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

645 kt ≅ 742.253 mph

An alternative is also that one mile per hour is approximately zero point zero zero one times six hundred forty-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