Mortar Plaster Calculator

Mortar Plaster — Quantity Calculator

Area × Thickness → Wet volume → Dry volume (×1.33) → Cement, Sand, Water

Wall Area (m²)

Include both sides if needed, or pick “Both sides”.

Plaster Sides One side Both sides

Thickness (mm)

Mix Ratio (Cement : Sand)

1 : 3 4 5 6

Common plaster: 1:4 or 1:5 (by volume).

Wastage / Contingency (%)

Cement Bag Size (kg)

50 kg ≈ 0.035 m³ per bag.

Dry→Wet Factor

Default 1.33 for bulking/voids.

Water–Cement Ratio (w/c)

Guide only (liters ≈ w/c × cement kg).

Openings Total Area to Subtract (m²) — optional

Mix: 1 : 4 Thickness: 15 mm Sides: 1

Net Plaster Area

—

m² (after sides & openings)

Wet Volume

—

m³ = Area × (thickness m)

Dry Volume

—

m³ = Wet × factor

Dry + Wastage

—

m³ incl. %

Cement

—

kg · bags

Sand

—

m³ (loose)

Water (guide)

—

liters = w/c × cement kg

Assumptions: Volumetric mix (cement:sand). Dry-volume factor accounts for bulking/voids (default 1.33). One 50 kg cement bag ≈ 0.035 m³ (≈ 0.0007 m³ per kg). Adjust for your local materials and site conditions.

Import Calculator JSON

Paste JSON below or choose a file.

✎ Edit Post ↑ Top Up