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 558 knots into miles per hour we have to multiply 558 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

558 kt → V_(mph)

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

V_(mph) = 558 kt × 1.1507794480225 mph

V_(mph) = 642.13493199658 mph

The final result is:

558 kt → 642.13493199658 mph

We conclude that 558 knots is equivalent to 642.13493199658 miles per hour:

558 knots = 642.13493199658 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 0.0015573050930133 × 558 knots.

Another way is saying that 558 knots is equal to 1 ÷ 0.0015573050930133 miles per hour.

Approximate result

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

558 kt ≅ 642.135 mph

An alternative is also that one mile per hour is approximately zero point zero zero two times five hundred fifty-eight 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