Home · Calculators

Concrete volume

A quantity take-off for a single element. Not a mix design, programme or pour sequence.

Shape Rectangle — slab or padCylinder — column or pile

Length (m)

Width (m)

Thickness (mm)

Order allowance (%)

Cylinder diameter (m)

Cylinder height (m)

CalculateReset

Method

Rectangle: L × W × t, with thickness converted from millimetres. Cylinder: πd²h/4. Allowance is a multiplier, not measured wastage.

Worked slab: 4.5 × 2 × 0.200 = 1.800 m³ net, 1.890 m³ at 5%.

Logic: how this figure is built.

What the volume is

A slab is length times width times thickness. A pad is the same product. A cylinder is πr²h. The page can add an order allowance on top of that solid volume. The allowance is a percentage you choose, not a wastage rate from a standard.

Thickness is the structural thickness, not the finished floor build-up, unless that is the volume you meant. A 200 mm slab entered as 200 m is a thousand-fold error. The form is in metres for a reason.

The volume is the shape you named. A sloping pad, a hopper and a void former are not the rectangular product. Subtract voids before you trust the order.

Use it to turn a modelled outline into a cubic-metre figure for an order screen. It is not a mix design, not a reinforcement quantity, and not a pour sequence.

• Related: mass from density
• civil guide

Last checked 3 October 2026. Worked figures are scenarios. See methodology and the disclaimer.