Cement Sand Ratio For Plastering Calculator Square Feet

Plastering Ratio Calculation:

\[ \text{Cement Quantity} = \left(\frac{\text{Area}}{10.764}\right) \times \frac{\text{Ratio}}{1 + \text{Ratio}} \] \[ \text{Sand Quantity} = \left(\frac{\text{Area}}{10.764}\right) \times \frac{1}{1 + \text{Ratio}} \]

Cement Required:

Sand Required:

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1. What is Cement Sand Ratio for Plastering?

The cement sand ratio for plastering determines the strength and workability of the plaster. Common ratios are 1:4 (stronger) and 1:6 (more economical). This calculator helps determine quantities needed for square footage measurements.

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ \text{Cement Quantity} = \left(\frac{\text{Area (ft²)}}{10.764}\right) \times \frac{\text{Ratio}}{1 + \text{Ratio}} \times \text{Thickness (m)} \] \[ \text{Sand Quantity} = \left(\frac{\text{Area (ft²)}}{10.764}\right) \times \frac{1}{1 + \text{Ratio}} \times \text{Thickness (m)} \]

Where:

10.764 — Conversion factor from ft² to m²
Ratio — Cement to sand proportion (1:4 or 1:6)
Thickness — Plaster thickness in millimeters

Explanation: The calculator first converts square feet to square meters, then calculates material volumes based on the selected ratio and plaster thickness.

3. Importance of Correct Ratio

Details: Using the right cement-sand ratio ensures proper adhesion, durability, and crack resistance. 1:4 is stronger but more expensive, while 1:6 is more economical for less critical areas.

4. Using the Calculator

Tips: Measure wall area accurately in square feet. Standard plaster thickness is 12mm (for walls) or 8mm (for ceilings). Always add 10% extra for wastage.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between 1:4 and 1:6 ratio?
A: 1:4 has more cement, making it stronger but more expensive. 1:6 has more sand, making it more workable and economical.

Q2: How do I measure area for plastering?
A: Measure length × height of each wall, subtract openings (doors/windows), and sum all areas.

Q3: Why convert from ft² to m²?
A: Standard cement calculations use metric units (1 bag = 0.035 m³ coverage), while many measure walls in feet.

Q4: How much does one bag of cement cover?
A: At 1:4 ratio and 12mm thickness, one 50kg bag covers approximately 12-13 ft².

Q5: Should I account for wastage?
A: Yes, always add 10-15% extra to account for spillage, uneven surfaces, and application losses.