Plastering Calculator – How Much Plaster Do You Need?

Accurate material estimates

Prevents over-ordering or running short during your plastering project.

Accounts for openings

Subtract door and window areas for precise material calculations.

Standard mix ratio

Uses 1:4 cement-to-sand ratio common for wall plastering.

Dry volume adjustment

Automatically adds 30% for dry-to-wet volume conversion.

Budget planning

Know exact cement bags and sand volume before purchasing materials.

How thick should plaster be?

Single coat plaster is typically 12-15mm thick. Double coat applications use 20mm total. Ceilings usually need 10-12mm.

What is the best cement-sand ratio for plaster?

For walls, use 1:4 (cement:sand). For ceilings, 1:3 provides better adhesion. Richer mixes crack more easily.

How do I calculate plaster area?

Multiply length by height for each wall, then subtract door and window openings. Add all wall areas together.

How many cement bags for 100 sq ft plaster?

For 12mm thick 1:4 plaster, you need about 10-11 bags of 50kg cement per 100 square meters.

Do I add extra for wastage?

Yes, add 10-15% extra material for wastage, spillage, and uneven surfaces during application.