Concrete Volume Calculator - Material Estimator & Mix Ratio (m³, yd³)

Calculate how many bags of concrete or cubic yards you need

Estimate cement, sand, water, and aggregate volumes from custom mix ratios.

When Should You Use This Calculator?

Estimating cement, sand, aggregate, and water for slabs, columns, footings
Using mix ratios (M5–M30) or custom; waste factor
Output in m³ or yd³ for ordering
Estimate pours for specific shape types including Slab, Post Hole, and Sonotube

Key Features:

Volume and material quantities (cement, sand, aggregate, water)
Mix ratios (M5–M30) and custom; waste factor
m³ and yd³ output
Copy results and export (JSON for guests; PDF/CSV when signed in)

Frequently Asked Questions

How many bags of concrete do I need?

A typical 80lb bag yields about 0.6 cubic feet of concrete. Calculate your total volume in cubic feet, divide by 0.6, and add 5-10% for waste.

What is the "waste factor"?

Concrete projects often require more material than the exact math suggests due to spillage, uneven ground, or form spreading. Adding 5-10% waste is standard practice.

Can I export my Concrete Volume / Material Estimator calculations?

Yes! In guest mode, you can export your calculations to JSON format. Sign in is required for PDF and CSV export. Click the export button to download your results. This is perfect for record-keeping, sharing with others, or importing into other tools.

Does this calculator save my history?

Yes! Your calculation history is automatically saved. Guest users can save up to 50 calculations per workspace locally. Sign in for free to save up to 100 calculations per workspace, with access from any device when logged in.

Is this calculator free to use?

Absolutely! The Concrete Volume / Material Estimator is completely free with no sign-up required. Create a free account to unlock additional features like more calculation history, multiple workspaces, and the ability to access your saved data from any device.

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