ConcreteLab

Concrete Calculator

A free concrete calculator that turns slab, footing, and column dimensions into the two numbers a pour actually requires: cubic yards to order from a ready-mix supplier, and bag counts if you are mixing from 80, 60, or 40 lb bags. Every result is shown with and without a disclosed waste factor (default 10%), because the geometric volume of the forms is never the quantity you should buy. Everything is computed in your browser from the dimensions you enter — plain volume arithmetic for planning an order, not an engineering specification. Slab thickness, reinforcement, and mix strength for a structural pour are decisions for your local building code and contractor.