What this calculates
This page focuses on volume only. Every result table separates the exact geometric volume from the order quantity after your waste allowance, in all four units side by side.
Choose any of the eleven shapes; the formula and solid model for each are shown next to the inputs so you can verify the math yourself.
Formula
Rectangular: V = L × W × H · Round: V = π × (D/2)² × H
1 yd³ = 27 ft³ = 0.7646 m³ = 764.6 litres
Order quantity = exact volume × (1 + waste % ÷ 100)
Worked example
3 × 3 m slab, 10 cm thick
- 1.3 × 3 × 0.1 = 0.9 m³
- 2.= 31.78 ft³ = 1.177 yd³ = 900 litres
- 3.Add 10% waste: 0.99 m³ to order
Common mistakes
- Rounding intermediate values. The calculator keeps full precision internally and only rounds the display.
- Confusing volume with coverage — volume ÷ thickness gives the area a pour covers.
Frequently asked questions
How many litres are in a cubic yard of concrete?
One cubic yard is 764.6 litres (27 cubic feet × 28.317 litres per cubic foot).
Why show exact and with-waste volumes separately?
The exact volume is pure geometry and verifiable; the waste allowance is an estimate you control. Keeping them separate keeps the math honest.