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 221 knots into miles per hour we have to multiply 221 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

221 kt → V_(mph)

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

V_(mph) = 221 kt × 1.1507794480225 mph

V_(mph) = 254.32225801298 mph

The final result is:

221 kt → 254.32225801298 mph

We conclude that 221 knots is equivalent to 254.32225801298 miles per hour:

221 knots = 254.32225801298 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 0.003932019194124 × 221 knots.

Another way is saying that 221 knots is equal to 1 ÷ 0.003932019194124 miles per hour.

Approximate result

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

221 kt ≅ 254.322 mph

An alternative is also that one mile per hour is approximately zero point zero zero four times two hundred twenty-one 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