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How to measure a concrete slab

How to measure a concrete slab

By the Plankley team · Last checked 19 October 2026

Work it out: the concrete calculator shows the sum for your own measurements, with every figure editable.

Worked example: Order: 114 bags.

Open the concrete calculator

Safety: A quantity and geometry estimate, not a design. It's not a substitute for a builder, structural engineer or building control. For anything load-bearing, retaining, on a boundary or that people walk on or lean against, get professional advice and check Building Regulations and planning rules.

On this page

Length × width × depth
Millimetres vs metres
Bags vs ready-mix
Waste

Length × width × depth

Millimetres vs metres

Bags vs ready-mix

Waste

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Plankley is an independent site with UK calculators for DIY and the trades. Every figure is a planning estimate: check your supplier's or maker's figures before ordering. We don't test products.

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