Mortar Plaster Calculator

Mortar Plaster — Quantity Calculator

Area × Thickness → Wet volume → Dry volume (×1.33) → Cement, Sand, Water (plus 20 L bucket equivalents)

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

Mix ratio: 1:4 (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

—

Effective m² (after sides & openings)

Wet Volume

—

= Area × thickness • — buckets (20 L)

Dry Volume

—

— buckets (20 L)

Dry + Wastage

—

— buckets (20 L)

Cement

—

— buckets (20 L, volumetric)

Sand

—

— buckets (20 L)

Water (guide)

—

— buckets (20 L)

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). 1 bucket = 20 L = 0.02 m³. Adjust for your local materials and site conditions.

Import JSON

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