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Concrete Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Volume
33.33
- Cubic yards
- 1.235
- Cubic metres
- 0.944
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Concrete Calculator
The Concrete Calculator works out your volume, along with 2 related figures in an instant. Enter length, width and thickness and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the length.
- Enter the width.
- Enter the thickness.
- Read off your volume, together with cubic yards and cubic metres — the calculator updates automatically, with no button to press.
Formula
The Concrete Calculator uses the formula:
Volume = Length × Width × (Thickness ÷ 12)
Worked example
For example, with length of 10 ft, width of 10 ft and thickness of 4 in, the volume is 33.33.
| Length | 10 ft |
|---|---|
| Width | 10 ft |
| Thickness | 4 in |
| Volume | 33.33 |
|---|---|
| Cubic yards | 1.235 |
| Cubic metres | 0.944 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Volume
- The amount of three-dimensional space an object occupies, measured in cubic units.
Frequently asked questions
Multiply length × width × thickness, with thickness converted to feet. A 10 × 10 ft slab that is 4 inches thick is 10 × 10 × 0.333 = 33.33 cubic feet.
Divide cubic feet by 27, since a cubic yard is 27 cubic feet. The 33.33 cubic feet above is about 1.23 cubic yards.
Length and width are usually in feet, so the thickness in inches is divided by 12 to keep all measurements in the same unit before multiplying.
Yes. Allow around 5–10% extra for spillage, uneven sub-base and over-excavation, as running short mid-pour is costly.
Enter the length. Enter the width. Enter the thickness. Read off your volume, together with cubic yards and cubic metres — the calculator updates automatically, with no button to press.
Related guides
Concrete Table: Volume by Length
Reference table of volume for Concrete across a range of length values — exact, engine-computed figures you can read off at a glance.
How to Calculate Concrete: Formula, Steps & Examples
Learn how to calculate Concrete — the formula explained step by step, with worked examples and a free calculator to check your answer.