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Concrete Slab Calculator

Estimate concrete volume for a rectangular slab. This calculates material volume only and does not specify structural reinforcement.

Enter your values

m
m
cm
%

Use a decimal point, without thousands separators.

Example result
Concrete volume
2.1 m³

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Estimate concrete volume for a rectangular slab. This calculates material volume only and does not specify structural reinforcement.

V = length × width × thickness

Worked example

Show example inputs and result

Length: 5 · Width: 4 · Thickness: 10 · Extra allowance: 5.

Concrete volume
2.1 m³

Questions and answers

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method reviewed: October 8, 2026 · Methods & accuracy

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