221 knots in miles per hour
Conversion
221 knots is equivalent to 254.322258013203 miles per hour.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 mile per hour is equal to 0.00393201919412058 times 221 knots.
It can also be expressed as: 221 knots is equal to miles per hour.
Approximation
An approximate numerical result would be: two hundred and twenty-one knots is about two hundred and fifty-four point three one miles per hour, or alternatively, a mile per hour is about zero times two hundred and twenty-one knots.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.