Cement Gravel And Sand Calculator

Concrete Mix Formulas:

\[ \text{Cement (kg)} = \left[\text{Volume (m³)} \times 1.54 \times \left(\frac{1}{1 + \text{sand ratio} + \text{gravel ratio}}\right)\right] \times 1440 \] \[ \text{Sand (m³)} = \text{Volume (m³)} \times 1.54 \times \left(\frac{\text{sand ratio}}{1 + \text{sand ratio} + \text{gravel ratio}}\right) \] \[ \text{Gravel (m³)} = \text{Volume (m³)} \times 1.54 \times \left(\frac{\text{gravel ratio}}{1 + \text{sand ratio} + \text{gravel ratio}}\right) \]

Cement Required:

Sand Required:

Gravel Required:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Concrete Mix Calculation?

The concrete mix calculation determines the exact quantities of cement, sand, and gravel needed for a specific volume of concrete. It ensures the right proportions for desired strength and workability.

2. How Does the Calculator Work?

The calculator uses these formulas:

\[ \text{Cement (kg)} = \left[\text{Volume} \times 1.54 \times \left(\frac{1}{1 + \text{sand} + \text{gravel}}\right)\right] \times \text{density} \] \[ \text{Sand (m³)} = \text{Volume} \times 1.54 \times \left(\frac{\text{sand}}{1 + \text{sand} + \text{gravel}}\right) \] \[ \text{Gravel (m³)} = \text{Volume} \times 1.54 \times \left(\frac{\text{gravel}}{1 + \text{sand} + \text{gravel}}\right) \]

Where:

1.54 — Dry volume multiplier (accounts for voids)
Volume — Total concrete volume needed (m³)
Sand Ratio — Proportion of sand in mix (e.g., 2 for M15)
Gravel Ratio — Proportion of gravel in mix (e.g., 4 for M15)
Cement Density — Typically 1440 kg/m³

3. Importance of Accurate Mix Calculation

Details: Proper mix calculation ensures concrete strength, durability, and cost-effectiveness. Wrong proportions can lead to weak concrete or unnecessary material costs.

4. Using the Calculator

Tips: Enter the total volume needed, your mix ratios (e.g., 1:2:4 for M15 concrete), and cement density (default 1440 kg/m³). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are common mix ratios?
A: M15 (1:2:4), M20 (1:1.5:3), M25 (1:1:2) are common for different strength requirements.

Q2: Why the 1.54 multiplier?
A: It accounts for the dry volume being about 54% greater than wet concrete volume due to voids.

Q3: How to adjust for different cement densities?
A: Change the cement density value if using a different type of cement.

Q4: Does this account for water?
A: No, water-cement ratio is separate and typically 0.4-0.6 depending on requirements.

Q5: How accurate is this calculation?
A: It provides good estimates but actual requirements may vary slightly based on material quality and compaction.