Concrete construction / US units

Calculate how much
concrete you need.

Enter your project measurements to estimate concrete volume, bags of mix, and other materials. Each calculator explains which dimensions to use and what the result includes.

Three measurements for a rectangular pourA rectangular slab with length, width, and thickness labeled. No dimensions are specified.LengthWidthThicknessV = length × width × thickness
Measure the space you will fill. Use the inside dimensions of your forms.

01 / Concrete volume

What are you measuring?

For a rectangular slab, patio, or footing, multiply length by width and thickness. Choose a different calculator for round forms, hollow sections, or solid steps.

02 / Material quantities

Estimate materials for your project

Convert concrete volume to bags using the yield printed on your product. You can also estimate material weight, mesh sheets, and liquid product quantities from stated coverage.

03 / Estimating guides

Check your measurements and units

Learn the difference between cement and concrete, convert measurements correctly, and round material quantities before ordering.

Measurements

Measure inside the forms

Use the dimensions of the space that concrete will fill. Calculate that volume before adding any extra material for waste or uneven surfaces.

Browse the guides ↗

Calculations

Understand your estimate

Read the formula and the notes listed with each calculator. Check whether the result includes all the parts of your project.

Choose a calculator ↗