Construction material calculator
Quantities for blockwork, plaster, reinforcing steel, floor tiles, paint and roofing sheets from your own dimensions. Every assumption is shown and can be changed. For concrete, use the concrete calculator.
Result
- Area painted, all coats
- 200 m²
- Paint
- 21 litres
A primer or sealer coat on new plaster is usually a separate product with its own coverage.
No cost is estimated: the site has no verified material price observations yet, and it does not estimate a cost from an unverified figure.
What this is for
How many litres of paint a job takes. It is an estimate for ordering and checking, not a design or a bill of quantities for a contract.
How it works
- Litres = area × coats ÷ coverage per coat × (1 + waste %).
Assumptions
Each one is an input above. None of them is a legal or standard requirement.
| Assumption | Value used | Where it comes from |
|---|---|---|
| Coats | 2 | Your choice. |
| Coverage per coat | 10 m² per litre | Product size. Printed on the tin or in the product data sheet. Rough or new plaster takes more paint than the stated figure. |
| Waste allowance | 5 % | Site rule of thumb. Spillage and what stays in the tin and the tray. |
Worked example
100 m² in two coats at 10 m² a litre, with 5% waste: 21 litres.
Limitations
- Coverage is the maker’s figure for a smooth surface; new or rough plaster takes more.
- Primer and sealer are separate products with their own coverage.
- Quantities only: no labour, transport or cost.
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