1. What Are Concrete Mix Ratios?

Concrete mix ratios specify the proportion of cement, sand, and gravel in concrete. Common ratios include M15 (1:2:4) for general construction and M20 (1:1.5:3) for stronger applications.

2. How Does the Calculator Work?

The calculator uses standard concrete mix ratios and material densities:

Material densities:

• Cement: 1440 kg/m³
• Sand: 1680 kg/m³
• Gravel: 1500 kg/m³

Calculation Steps:

1. Calculate volume in cubic feet (area × thickness)
2. Convert to cubic meters
3. Calculate materials based on selected ratio
4. Convert cement to standard 50kg bags

3. Importance of Correct Mix Ratios

Details: Using the right mix ratio ensures concrete has the required strength and durability for its intended use, while avoiding waste of materials.

4. Using the Calculator

Tips: Measure your area accurately in square feet. Standard slab thickness is 4-6 inches. Select M15 for general use or M20 for stronger applications.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between M15 and M20 concrete?
A: M20 has a higher cement content, making it stronger but more expensive than M15.

Q2: How much water should I add?
A: Typically 0.4-0.6 times the weight of cement, but this depends on desired workability.

Q3: Can I use this for concrete slabs?
A: Yes, this calculator works for slabs, footings, and other concrete applications.

Q4: How accurate are these calculations?
A: They provide good estimates but actual requirements may vary based on material quality and site conditions.

Q5: What if I need a different mix ratio?
A: For custom ratios, consult a structural engineer or concrete specialist.