Concrete Mix Calculator
Estimate concrete volume and approximate material quantities (cement bags, sand, aggregate) by mix ratio.
Last reviewed by the Radiatus Cloud team
Output
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Estimate concrete volume and materials
A concrete job needs the right volume and the materials to make it. This calculator estimates the concrete volume and the approximate material quantities, cement, sand and aggregate, so you can order correctly.
Why volume and mix ratio both matter
The concrete you need is a volume, from the dimensions of what you are pouring, but ordering materials requires breaking that volume into cement, sand and aggregate by the mix ratio, which determines strength. Estimating both, the total volume and the quantity of each material, means you can order the right amounts rather than guessing and either running short mid-pour, which ruins the job, or over-ordering expensive material. The material split follows the standard ratios for the mix strength you need.
A planning estimate
These are estimates from a standard method for general planning, not professional advice; confirm anything important for your specific situation. It runs entirely in your browser, so nothing you enter is uploaded and it works without an account, keeping your figures on your own machine.
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Frequently Asked Questions
How is concrete volume calculated?
From the dimensions of what you are pouring, length times width times depth, giving the volume of concrete needed.
How are the materials estimated?
By splitting the volume into cement, sand and aggregate according to the mix ratio, which determines the concrete’s strength.
Why does the mix ratio matter?
Because it determines strength: more cement gives stronger concrete. The ratio sets how the volume divides into the three materials.
Why not run short mid-pour?
Because concrete sets, so a pour must be completed in one go. Running short ruins the job, which is why estimating enough matters.
Is my data uploaded?
No. The calculation runs entirely in your browser.
Privacy & Security
Calculated locally in your browser. Use as an estimate for planning.
How to Use
Enter slab dimensions and mix ratio to estimate quantities.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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