Concrete Calculators

How Concrete Material Quantities Are Calculated for Columns and Footings

For columns or footings, total wet volume is scaled up by a wastage allowance and the standard 1.54 dry-volume factor, then split into cement, sand, and aggregate according to the chosen mix ratio.

How to Calculate Cement, Sand and Aggregate for Concrete

Concrete material quantities come from the wet volume you need, expanded by a 1.54 "dry volume" factor (since dry cement, sand, and aggregate take up more space than the wet, mixed concrete), then split according to your mix ratio — a richer mix like M20 (1:1.5:3) uses noticeably more cement than a leaner mix like M15 (1:2:4) for the identical volume of concrete.

How to Calculate the Volume of a Concrete Pour

For any rectangular concrete pour, volume is simply length times width times height (or thickness) — the raw cubic-meter figure used to order ready-mix concrete, before any material breakdown is applied.

Why Raw Volume Isn't Enough to Order Concrete Materials

Knowing a pour's cubic-meter volume is enough to order ready-mix concrete, but mixing that same concrete on-site from raw materials needs two more pieces of information: a mix ratio and a wastage/dry-volume adjustment.