1. What is this Calculator?

This calculator determines the quantities of sand and cement needed for mortar mixes according to UK standards. It uses standard density values and accounts for the mortar ratio you specify.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• 1.33 — Standard factor accounting for mortar voids
• 1440 — Density of cement (kg/m³)
• 1600 — Density of sand (kg/m³)
• ratio — Cement:sand ratio (e.g., 4 for 1:4 mix)

Explanation: The calculation first determines the volume proportions of each material based on the ratio, then converts to weight using standard densities.

3. Importance of Accurate Mortar Calculation

Details: Proper mortar mix proportions are essential for structural integrity, workability, and durability of masonry work. Incorrect ratios can lead to weak bonds or cracking.

4. Using the Calculator

Tips: Enter the total volume of mortar needed in cubic meters and your desired cement:sand ratio (e.g., enter 4 for a 1:4 mix). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are common mortar ratios in the UK?
A: Common ratios are 1:3 to 1:6 (cement:sand) depending on application. 1:4 is typical for general brickwork, while 1:3 is stronger for structural work.

Q2: Why are the densities fixed at 1440 and 1600 kg/m³?
A: These are standard UK values for ordinary Portland cement and dry sand. Actual densities may vary slightly but these provide good estimates.

Q3: Does this account for water in the mix?
A: No, the calculation is for dry materials. Water is typically added at about 1 part water to 4 parts cement by volume.

Q4: How accurate is this calculator?
A: It provides good estimates for planning purposes. For critical applications, consult a structural engineer and account for material variations.

Q5: Can I use this for concrete calculations?
A: No, concrete includes aggregate and has different mix design considerations. This is specifically for cement-sand mortar.