How to convert 686 imperial cups to US customary cups?
We know (by definition) that:
We can set up a proportion to solve for the number of US customary cups.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.00121381076476529 times 686 imperial cups.
It can also be expressed as: 686 imperial cups is equal to US customary cups.
An approximate numerical result would be: six hundred and eighty-six imperial cups is about eight hundred and twenty-three point eight five US customary cups, or alternatively, a US customary cup is about zero times six hundred and eighty-six imperial cups.
 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.