646 knots in miles per hour
Conversion
646 knots is equivalent to 743.403523423208 miles per hour.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 mile per hour is equal to 0.00134516446114651 times 646 knots.
It can also be expressed as: 646 knots is equal to miles per hour.
Approximation
An approximate numerical result would be: six hundred and forty-six knots is about seven hundred and forty-three point three nine miles per hour, or alternatively, a mile per hour is about zero times six hundred and forty-six 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.