Concrete Calculator for Circular Slab — Estimate Volume, Cement, Sand & Gravel

Working out concrete for a round slab isn’t hard when you know the measurements, but doing it by hand can get messy.

This concrete calculator for circular slab makes the job easy.
You just put in the slab radius and the thickness, and it quickly gives you how much concrete you’ll need — no guessing, no wasted mix.

The result also shows how many bags of cement go in, plus the sand and gravel amounts, based on the common 1:2:4 cement-sand-gravel ratio most sites use.

Whether it’s for a water tank base, a round patio, or a circular platform, the calculator handles it in seconds.

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If you’ve ever tried calculating circular concrete by formula, you’ll know how many steps it takes.

This concrete mix calculator saves that effort. It’s simple: measure once, enter your values, and you get the full slab volume calculation with all the material details ready for order or on-site mixing.