Concrete Mix Ratio Calculator
Calculate cement, sand and aggregate quantities for M10, M20, M25 concrete mixes. Enter volume to get bags, kg and cubic meters.
Mix Specifications
Materials Required
Concrete Mix Ratios Reference
M10 = 1 : 3 : 6 (Cement : Sand : Aggregate)
M15 = 1 : 2 : 4
M20 = 1 : 1.5 : 3
M25 = 1 : 1 : 2
M30 = 1 : 0.75 : 1.5
What Is Concrete Mix Ratio?
A concrete mix ratio defines the exact proportions of cement, sand, and coarse aggregate required to achieve a specific compressive strength. These ratios are measured by volume. For example, a 1:2:4 ratio means you mix 1 part cement, 2 parts sand, and 4 parts gravel.
The "M" stands for Mix, and the number represents the compressive strength of the concrete in MPa (Megapascals) after curing for 28 days. M20 (1:1.5:3) is the most common grade for standard residential construction like driveways and patios. A higher M grade indicates a higher cement content, which results in higher strength and durability.
Mix Ratios Reference Table
| Grade | Ratio (C:S:A) | Compressive Strength | Common Use |
|---|---|---|---|
| M10 | 1:3:6 | 10 MPa | Non-structural lean concrete |
| M15 | 1:2:4 | 15 MPa | Footings, pathways |
| M20 | 1:1.5:3 | 20 MPa | Standard residential slabs |
| M25 | 1:1:2 | 25 MPa | Beams, columns |
| M30 | 1:0.75:1.5 | 30 MPa | High-load structures |
Frequently Asked Questions
What is the M20 concrete mix ratio?
M20 concrete uses a 1:1.5:3 ratio of cement to sand to coarse aggregate by volume. For 1m³ of M20, you need approximately 8 bags of 50kg cement, 0.44m³ of sand, and 0.88m³ of aggregate.
How much cement sand and aggregate do I need for 1m³ of M20 concrete?
For 1 cubic meter of M20 (1:1.5:3): approximately 8 bags (400kg) of cement, 680kg of sand, and 1,200kg of coarse aggregate, plus 160–180 liters of water.
What is the cement sand aggregate ratio for M25?
M25 uses a 1:1:2 ratio. Higher cement content gives it 25 MPa compressive strength, suitable for structural elements like beams, columns and RCC slabs.