Sand Render Calculator

Sand Render Formulas:

\[ \text{Cement (kg)} = \left[\text{Area (m²)} \times \text{Thickness (m)} \times 1.33 \times \left(\frac{1}{1 + \text{ratio}}\right)\right] \times 1440 \] \[ \text{Sand (kg)} = \left[\text{Area (m²)} \times \text{Thickness (m)} \times 1.33 \times \left(\frac{\text{ratio}}{1 + \text{ratio}}\right)\right] \times 1600 \]

Cement Required:

Sand Required:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Sand Render?

Sand render is a cement-based coating applied to walls for protection and decoration. The most common mix ratios range from 1:3 to 1:6 (cement:sand). This calculator helps determine the exact quantities of materials needed for your project.

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ \text{Cement (kg)} = \left[\text{Area} \times \text{Thickness} \times 1.33 \times \left(\frac{1}{1 + \text{ratio}}\right)\right] \times 1440 \] \[ \text{Sand (kg)} = \left[\text{Area} \times \text{Thickness} \times 1.33 \times \left(\frac{\text{ratio}}{1 + \text{ratio}}\right)\right] \times 1600 \]

Where:

1.33 — Factor accounting for material compaction and waste
1440 — Density of cement (kg/m³)
1600 — Density of sand (kg/m³)
Ratio — Cement to sand proportion (e.g., 4 for 1:4 mix)

3. Importance of Accurate Material Calculation

Details: Proper material estimation prevents wastage, ensures consistent mix quality, and helps with project budgeting. Too much cement can make the render brittle, while too little weakens it.

4. Using the Calculator

Tips: Measure wall area accurately. Typical render thickness is 15mm (0.015m). Common ratios are 1:4 for external walls and 1:6 for internal walls. Always buy 10% extra materials to account for waste.

5. Frequently Asked Questions (FAQ)

Q1: What's the standard thickness for sand render?
A: Typically 10-20mm (0.01-0.02m). External renders are usually thicker than internal ones.

Q2: Why is there a 1.33 multiplication factor?
A: This accounts for material compaction during application and typical wastage on site.

Q3: Can I use this for different mix ratios?
A: Yes, the calculator works for any cement:sand ratio. Just enter your desired ratio value.

Q4: Should I use different sand types?
A: Sharp sand is best for render. Fine sand may require more cement to prevent cracking.

Q5: How does this compare to ready-mix render?
A: Ready-mix products have different coverage rates - always check manufacturer specifications.