Free Volume, Area & Depth Calculator
Relate volume (m³) to area (m²) using a depth or thickness. Enter any two of volume, area, and depth and the calculator finds the third — handy for concrete, flooring, soil, and paint coverage.
Enter any two — the third is calculated. Volume = Area × Depth.
m³ and m² are different dimensions, so a depth is required to relate them: Area = Volume ÷ Depth, Volume = Area × Depth. Useful for concrete, flooring, soil, and paint coverage.
Quick answer
Volume and area are different dimensions, so you cannot convert one to the other without a depth. Use Area = Volume ÷ Depth, or Volume = Area × Depth. For example, 2 m³ spread 10 cm thick covers 20 m².
Formula & method
Volume = Area × Depth → Area = Volume ÷ Depth, Depth = Volume ÷ Area
Use consistent units (m³, m², m). The tool converts a depth in cm for you.
Examples
- Input
- 2 m³ at 10 cm thick
- Result
- 20 m²
- Why
- Area = 2 ÷ 0.1 = 20 m². Two cubic metres of concrete at 10 cm thickness covers 20 square metres.
- Input
- 30 m² at 5 cm
- Result
- 1.5 m³
- Why
- Volume = 30 × 0.05 = 1.5 m³, so you need 1.5 cubic metres of material.
- Input
- 3 m³ spread over 60 m²
- Result
- 0.05 m (5 cm)
- Why
- Depth = 3 ÷ 60 = 0.05 m, i.e. a 5 cm layer.
When to use this tool
- Estimating concrete or screed volume for a floor or slab.
- Working out how much soil, gravel, or sand covers an area at a given depth.
- Checking paint or coating coverage.
- Converting cubic metres (m³) to floor area for construction quotes.
Common mistakes
- Trying to convert m³ to m² with a single fixed number — there isn't one; the answer depends on the depth.
- Mixing units: keep area and volume in metres while the depth is in cm — the tool converts cm to metres so the result stays correct.
- Confusing the layer thickness with the height of a room — here 'depth' is the thickness of the material.
Frequently asked questions
How do I convert m³ to m²?
You cannot with a single number — they measure different things (volume vs area). Divide the volume by the depth (thickness): Area = Volume ÷ Depth. For example, 1 m³ at 5 cm thick covers 20 m².
How many m² is 1 m³?
It depends on the thickness. 1 m³ at 10 cm thick covers 10 m²; at 5 cm it covers 20 m². There is no fixed answer without a depth.
What is the formula?
Volume = Area × Depth. Rearranged: Area = Volume ÷ Depth, and Depth = Volume ÷ Area, with all lengths in consistent units.
Can I enter the depth in centimetres?
Yes. Toggle the depth unit between cm and m; the calculator converts internally so the area and volume stay correct.
Does this work for concrete, soil, or paint?
Yes. Enter the area you want to cover and the layer thickness to get the volume of material needed, or enter the volume you have to see how much area it covers.
Sources & references
External references open in a new tab. We are independent and not affiliated with these organizations.
- ✓ Free to use
- ✓ No sign-up required
- ✓ Runs entirely in your browser — nothing is uploaded.
- ✓ Formula and method shown above
Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.
Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.
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