Plaster Coverage Calculator (m2)

How to Use This Calculator

This calculator helps you estimate the amount of plaster (enduit) needed for a wall or ceiling project. Start by measuring the surface area to be covered in square meters. Then decide the thickness of the plaster layer—common thicknesses range from 10 mm for thin finishes to 20 mm for rough coats. Finally, input the yield of your specific plaster product, usually provided by the manufacturer as kilograms per square meter per millimeter (kg/m²/mm).

Formula and Methodology

The calculation is straightforward: Quantity (kg) = Surface (m²) × Thickness (mm) × Yield (kg/m²/mm). For example, a wall of 40 m² with 15 mm thickness and a yield of 1.5 kg/m²/mm requires 40 × 15 × 1.5 = 900 kg of plaster. You can also calculate the volume of wet plaster: Volume (m³) = Surface × Thickness (in meters). This volume helps in estimating mixing water and total material volume.

Practical Examples

Imagine you are plastering a living room wall that is 8 meters long and 2.5 meters high, giving a surface of 20 m². You plan to apply a 12 mm layer. With a yield of 1.4 kg/m²/mm, you would need 20 × 12 × 1.4 = 336 kg. Considering a 10% waste, buy about 370 kg. For an entire house, sum all wall and ceiling surfaces.

Tips and Best Practices

Always add 5-10% extra for waste, spillage, and uneven surfaces. Verify the yield from the product datasheet—different plasters (lime, gypsum, cement-based) have different densities and yields. If you are unsure, consult a professional. For multi-layer rendering, calculate each layer separately with its own thickness and yield.