345 UK tablespoons in US customary cups
Result
The conversion result is: 345 UK tablespoons is equivalent to 21.8734459352547 US customary cups.[1]
Conversion formula
How to convert 345 UK tablespoons to US customary cups?
We know (by definition) that: 1 brtablespoon ≈ 0.0634012925659556 uscup.
We can set up a proportion to solve for the number of US customary cups.
1 brtablespoon / 345 brtablespoon ≈ 0.0634012925659556 uscup / x uscup
Now, we cross multiply to solve for our unknown x:
x uscup ≈ (345 brtablespoon / 1 brtablespoon) * 0.0634012925659556 uscup → x uscup ≈ 21.873445935254683 uscup
Conclusion:
345 brtablespoon ≈ 21.873445935254683 uscup

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.0457175336231884 times 345 UK tablespoons.
It can also be expressed as: 345 UK tablespoons is equal to 1 / 0.0457175336231884 US customary cups.
Approximation
An approximate numerical result would be: three hundred and forty-five UK tablespoons is about twenty-one point eight seven US customary cups, or alternatively, a US customary cup is about zero point zero five times three hundred and forty-five UK tablespoons.
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.