CONCRETE RATIO TOOLS
Concrete volume calculator for slabs and footings
Enter length, width and thickness to find concrete volume in m³ or litres, with an optional allowance and transfer into your mix design.
Enter your dimensions
Your planning allowance for waste or site variation; default 0%.
CONCRETE REQUIRED
6 × 4 × 0.15 × 1 = 3.6 m³3.6 × (1 + 0 / 100) = 3.6 m³
Using the illustrative M30 example. You can send your own mix from the main calculator.
From dimensions to ingredients
A 6 m × 4 m slab with a 0.15 m thickness has a geometric volume of 3.6 m³. Six identical rectangular footings are calculated by multiplying the single-footing volume by six. Enter decimal feet when using feet; 6 feet 6 inches is 6.5 ft.
The allowance is added once and shown separately. Dimensions must describe separate, non-overlapping concrete volumes. For stepped or tapered footings, split the shape into suitable components; this calculator handles rectangular members. It does not determine structural thickness, reinforcement or load capacity.
Designed volume and delivered yield
Press Use this volume to scale the ingredient quantities in the mix lab. Actual concrete yield depends on fresh density and actual batched masses; site dimensions and losses also affect the order quantity. See NRMCA CIP 8: Discrepancies in Yield.