851 US customary teaspoons in US customary cups
Result
The conversion result is: 851 US customary teaspoons is equivalent to 17.7291666666667 US customary cups.[1]
Conversion formula
How to convert 851 US customary teaspoons to US customary cups?
We know (by definition) that: 1 usteaspoon ≈ 0.0208333333333333 uscup.
We can set up a proportion to solve for the number of US customary cups.
1 usteaspoon / 851 usteaspoon ≈ 0.0208333333333333 uscup / x uscup
Now, we cross multiply to solve for our unknown x:
x uscup ≈ (851 usteaspoon / 1 usteaspoon) * 0.0208333333333333 uscup → x uscup ≈ 17.72916666666664 uscup
Conclusion:
851 usteaspoon ≈ 17.72916666666664 uscup

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.0564042303172738 times 851 US customary teaspoons.
It can also be expressed as: 851 US customary teaspoons is equal to 1 / 0.0564042303172738 US customary cups.
Approximation
An approximate numerical result would be: eight hundred and fifty-one US customary teaspoons is about seventeen point seven three US customary cups, or alternatively, a US customary cup is about zero point zero six times eight hundred and fifty-one US customary teaspoons.
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.