Concrete Calculator - Free Home Improvement Calculator

Length

Width

Thickness

Quantity

Waste allowance

Bag yield

ft³ / bag

Cubic metres1.246 m³

Cubic feet44 ft³

Cubic yards1.63 yd³

Bags74Based on the bag yield you entered.

Material quantities are planning estimates. Confirm actual package coverage, density, dimensions and installation requirements before purchasing.

How to use the Concrete Calculator

Choose imperial or metric measurements where available.
Enter the dimensions of the room, surface, structure or material.
Add waste, packaging, density or price information when relevant.
Review the calculated material quantity and round purchasing quantities according to the supplier's actual package size.

Examples

Formula

Rectangular volume = length × width × thickness. Cylinder volume = π × radius² × height.

Worked example

A slab can be entered with its length, width and thickness, then increased by a waste allowance before ordering.

Frequently asked questions

Is this concrete calculator free?

Yes. It is free to use and does not require an account or paid API.

Should I include extra material for waste?

Usually yes. Cutting, breakage, pattern matching, compaction and job-site conditions can increase actual material use. Choose a waste allowance appropriate for the project and material.

Are material quantities exact?

No. The result is a planning estimate based on your measurements and assumptions. Confirm package coverage, material density, product instructions and job requirements with the supplier or contractor.

Can I use metric measurements?

Yes. The Home & DIY calculators support metric or imperial measurements where those units are relevant.

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