Cement Sand Calculator

What is Cement Sand?

The Cement Sand Calculator computes raw materials required for mortar applications (wall plaster, tile bedding, floor screed) based on surface area and plaster thickness.

Formula

Wet Mortar Volume = Surface Area (m²) × Plaster Thickness (m)
Dry Mortar Volume = Wet Mortar Volume × 1.33
Cement Bags = [ (Dry Vol × Cement Ratio ÷ Ratio Sum) × 1440 ] ÷ 50

Variables Explanation

- Surface Area: Total wall/floor plastering area in m².
- Thickness: Plaster depth in meters (e.g. 12mm = 0.012m, 20mm = 0.020m).
- Mix Ratios: 1:3, 1:4 (internal/ceiling), 1:6 (external brick mortar).

How to Calculate

1. Enter total surface area in m².
2. Input plaster thickness in mm (e.g. 12mm internal plaster).
3. Select mortar mix ratio (e.g. 1:4).
4. View total cement bags and sand weight required.

Worked Example

Internal Wall Plaster: 150 m² area, 12mm thickness (0.012m), 1:4 mix ratio.
Wet Volume = 150 × 0.012 = 1.8 m³.
Dry Volume = 1.8 × 1.33 = 2.394 m³.
Cement Vol = 2.394 × (1 / 5) = 0.4788 m³.
Cement Bags = (0.4788 × 1440) ÷ 50 = 14 Bags.
Sand = (2.394 × 4 / 5) × 1.6 = 3.06 Tons.

Practical Construction & Project Controls Use

Estimating materials for internal wall plastering, external rendering, tile mortar beds, and self-leveling floor screeds.

Understanding the Result

Provides exact bag and sand quantities to order for finishing works.

Limitations & Assumptions

Does not include extra mortar consumed by uneven brick joints or keying grooves (add 10% for rough brick surfaces).