1. What is this Calculator For?

This calculator helps determine the exact quantities of cement and sand needed for blockwork mortar based on the volume of mortar required and the desired cement:sand ratio.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• 1.33 — Accounts for voids in sand
• 1440 — Density of cement (kg/m³)
• 1600 — Density of sand (kg/m³)
• Ratio — Cement:sand proportion (e.g., 1:4 ratio = 4)

3. Importance of Accurate Calculations

Details: Proper mortar mix proportions are essential for structural integrity, workability, and durability of blockwork. Too much cement can make the mix brittle, while too little weakens the bond.

4. Using the Calculator

Tips:

• Calculate mortar volume based on wall dimensions and joint sizes
• Common ratios are 1:3 to 1:6 (cement:sand) for blockwork
• Use dry volume measurements for accuracy

5. Frequently Asked Questions (FAQ)

Q1: What's a typical mortar ratio for blockwork?
A: For general blockwork, 1:4 (cement:sand) is common. For load-bearing walls, 1:3 may be used.

Q2: Why multiply by 1.33?
A: This accounts for voids in sand (bulking factor) to ensure proper volume.

Q3: Can I use this for bricklaying mortar?
A: Yes, but brickwork typically uses different ratios (often 1:5 or 1:6).

Q4: How do I calculate mortar volume?
A: Estimate based on wall area × joint thickness (typically 10mm) minus block volume.

Q5: Should I account for wastage?
A: Yes, add 5-10% extra to calculated amounts to account for spillage and other losses.