640 knots in miles per hour
Result
The conversion result is: 640 knots is equivalent to 736.498846735067 miles per hour.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 mile per hour is equal to 0.00135777537796976 times 640 knots.
It can also be expressed as: 640 knots is equal to 1 / 0.00135777537796976 miles per hour.
Approximation
An approximate numerical result would be: six hundred and forty knots is about seven hundred and thirty-six point five zero miles per hour, or alternatively, a mile per hour is about zero times six hundred and forty 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.