Free Concrete Calculator – Volume, Cubic Yards & Bags

Concrete Calculator Guide

The Concrete Calculator estimates the volume of concrete needed for slabs, footings, columns, steps, walls, and post holes. Enter your project dimensions to instantly see cubic feet, cubic yards, cubic meters, and the number of pre-mix bags required.

For slabs, enter length, width, and thickness. For footings and walls, enter length, height, and thickness. For columns and post holes, enter diameter and depth. For steps, enter the number of steps, width, rise height, and tread depth — the calculator computes the solid fill volume.

Pre-mix concrete bags come in 40, 60, and 80 lb sizes. An 80 lb bag yields approximately 0.60 cubic feet. For large projects over 1 cubic yard, consider ordering ready-mix concrete instead — it is more cost-effective and ensures consistent mix quality.