1. What is a Sand and Cement Mortar Calculator?

Definition: This calculator estimates the volume of mortar needed for UK construction projects based on area, thickness, mix ratio, and cement yield.

Purpose: It helps builders and DIYers determine how much sand and cement is required for bricklaying, pointing, or rendering projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M \) — Mortar volume (m³)
• \( A \) — Area to be covered (m²)
• \( T \) — Thickness of mortar (mm)
• \( R \) — Cement:sand ratio (unitless)
• \( Y \) — Yield per bag of cement (m³/bag)

Explanation: The area multiplied by thickness gives volume, adjusted by mix ratio, then divided by cement yield to determine total mortar needed.

3. Importance of Mortar Calculation

Details: Accurate mortar calculation ensures proper material ordering, minimizes waste, and helps maintain consistent mix ratios throughout the project.

4. Using the Calculator

Tips:

• Enter area in square meters
• Typical thickness: 10mm for bricklaying, 5mm for pointing
• Common ratios: 1:4 (general bricklaying), 1:5 (internal walls)
• Standard yield: 0.034m³ per 25kg cement bag

5. Frequently Asked Questions (FAQ)

Q1: What's a typical cement:sand ratio for bricklaying?
A: In the UK, 1:4 (cement:sand) is common for general bricklaying, while 1:5 might be used for internal walls.

Q2: How do I convert mortar volume to bags of cement?
A: Divide the total volume by the yield per bag (e.g., 0.034m³ for 25kg cement bags).

Q3: What thickness should I use for pointing?
A: Typically 5-10mm for repointing existing brickwork.

Q4: Does this include wastage?
A: No, consider adding 10% to the calculated volume for project contingencies.

Q5: How much sand per bag of cement?
A: For 1:4 ratio, you'll need 4 parts sand for each part cement by volume.