Which thickness do I need?

12 mm is standard for internal brick walls, 6 mm for smooth concrete surfaces, and 15 to 20 mm for external or uneven walls.

What mix ratio should I use?

1:4 (cement:sand) for internal walls and ceilings; 1:6 for external work and where economy matters more than strength.

Does this cover both sides of a wall?

The calculator works on whatever area you enter. For both faces, enter double the wall face area.

Plaster Calculator - Cement & Sand for Any Thickness

Cement bags and sand for plastering, from area, thickness and mortar mix.

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How This Was Calculated

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Plaster Quantities Without the Site Guesswork

Plastering mixes small numbers - 12 mm here, 1:4 there - into surprisingly large material orders. AiLoveKit's plaster calculator multiplies your area by the chosen thickness, applies the 1.33 dry-mortar factor and splits cement from sand by your mix ratio, with the full working shown.

Common Plaster Specs

Internal walls - 12 mm at 1:4.
External walls - 15 to 20 mm at 1:6.
Ceilings - 6 to 10 mm at 1:4.