Concrete Calculator for Circular Volumes

This calculator will give you the total cubic yards for
circular slabs or circular columns. Input values as stated.
Assumes a constant diameter. There are no add factors -
this is neatline quantities. This estimator is by no means
perfect, it will only give a ballpark estimate to check
actual estimates. The values and formula will solve for
any circular plan. The values will be rounded up to nearest
whole number.

Only modify fields with an * beside it.