991 knots in miles per hour
Result
The conversion result is: 991 knots is equivalent to 1140.42243299133 miles per hour.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 mile per hour is equal to 0.00087686805439016 times 991 knots.
It can also be expressed as: 991 knots is equal to 1 / 0.00087686805439016 miles per hour.
Approximation
An approximate numerical result would be: nine hundred and ninety-one knots is about one thousand, one hundred and forty point four two miles per hour, or alternatively, a mile per hour is about zero times nine hundred and ninety-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.