Free Tools
Plaster & Skim Coat Calculator
Calculate cement and sand for plastering and skim coat from wall area. Free, with adjustable SNI coefficients.
Advanced — SNI coefficients▾
Typical values for 1:4 plaster at 1.5 cm & skim coat; adjust as needed.
Prices (optional)
Important — this is an estimate
Estimate based on standard coefficients; real needs depend on specification, work method, and field conditions. For an accurate BoQ, consult Luxury Art.
Coefficients reference SNI AHSP (typical values, adjustable).
Plaster & skim requirement
Estimate for 1:4 plaster at ~1.5 cm; real needs depend on thickness, wall flatness, and workmanship.
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How to calculate plaster & skim coat
Plaster = base layer
Plaster is the cement-sand layer that levels the brick surface before finishing. Common thickness is ~1.5 cm with a 1:4 mix. Cement and sand needs come from wall area × coefficient per m².
Skim coat = smooth top layer
Skim coat is a thin layer of pure cement over plaster, making the wall smooth and paint-ready. Skim only needs cement (no sand), about 3.25 kg/m². Enable the skim option if the wall will be skimmed.
Count both faces if needed
Walls are usually plastered on both faces. Make sure the area you enter covers all surfaces to be plastered, and subtract openings like doors and windows.
FAQ
Frequently asked questions
How much cement and sand for plaster per m²?
For 1:4 plaster at 1.5 cm thick, typical needs are about 7.8 kg cement and 0.023 m³ sand per m². The calculator totals this by your wall area, then converts cement to bags. All coefficients are adjustable.
How much cement for skim coat per m²?
Skim coat uses only cement (no sand), about 3.25 kg per m². If you enable the skim option, the calculator adds this to total cement, so you know the total bags to buy at once.
Does plaster thickness affect the needs?
Very much. Thicker plaster means more cement and sand. This calculator's default is ~1.5 cm. If your wall is uneven and needs thicker plaster, raise the cement and sand coefficients under Advanced Settings.
Is brickwork included?
No. This calculator is specific to plaster and skim coat. Bricks and their laying mortar are calculated separately in the brick calculator. Combine both for a complete wall material picture.
How do I estimate the cost?
Enter the cement price per bag and sand per m³ in the price fields and the calculator computes the material cost. For a full BoQ including plasterer labor, the Luxury Art team can help.
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