Plastering & Rendering Calculator
Calculate cement and sand quantities for plastering walls and ceilings. Supports various mix ratios (1:3 to 1:6), multiple plaster thicknesses, and provides accurate material estimates for internal and external rendering.
Total surface area to be plastered
Enter wall specifications and click Calculate to see materials
Notes:
- Dry volume is 33% more than wet volume (mortar shrinkage)
- 1:4 ratio is standard for internal plastering
- 1:6 ratio is economical for external rough surfaces
- Add 5-10% extra for wastage in actual ordering
- Water quantity varies with sand moisture content
ESTIMATION NOTICE
This calculator provides APPROXIMATE QUANTITIES for budgeting and planning purposes.
Please note:
• Results include standard wastage factors but actual waste may vary based on site conditions, workmanship, and material quality.
About This Calculator
The Plastering & Rendering Calculator helps contractors and quantity surveyors estimate cement and sand quantities for wall and ceiling finishes across UAE and Gulf projects. Calculate accurate material requirements based on surface area, plaster thickness, and mortar mix ratios. Essential for BOQ preparation and material procurement for internal plastering, external rendering, and decorative finishes in residential and commercial buildings.
When to Use This Calculator
- Preparing BOQ for plastering and rendering works
- Estimating cement and sand for internal wall finishes
- Calculating materials for external rendering in Gulf climate
- Planning multi-coat plaster systems (scratch, brown, finish)
- Verifying subcontractor material requirements
How to Use This Calculator
Enter Surface Area
Input total wall or ceiling area in square meters, or calculate from room dimensions.
Select Plaster Thickness
Choose thickness: 12mm for internal walls, 15-20mm for external rendering, 6mm for ceiling.
Choose Mortar Mix Ratio
Select mix ratio: 1:3 for external, 1:4 for internal walls, 1:5 for ceilings.
Deduct Openings
Enter door and window areas to deduct from total plastering area.
Calculate Results
Get cement bags, sand volume, and water requirements with wastage allowance.
Typical Scenarios in UAE & Gulf Projects
A 400m² villa requires internal wall plastering at 12mm thickness using 1:4 mix. The calculator estimates 4.8m³ mortar, 96 bags cement (50kg), 3.84m³ sand, with 5% wastage for a smooth sand-cement finish ready for painting.
A 20-story residential tower needs 8,000m² external rendering at 20mm thickness using 1:3 weatherproof mix. Calculator determines 160m³ mortar, 4,000 bags cement, 120m³ sand, plus polymer additive requirements for Gulf humidity resistance.
Frequently Asked Questions
Take Your Calculations Further
This calculator reflects the logic built into Arkan's construction management platform.
Last Updated: January 2026
Standards Reference: Plaster specifications per BS EN 13914 and ASTM C926