Home
Back
Standard Concrete Mix Ratios:
M15 Grade: 1:2:4 (Cement: Sand: Aggregate)
M20 Grade: 1:1.5:3 (Cement: Sand: Aggregate)
| From: | To: |
Concrete mix ratios specify the proportion of cement, sand, and aggregate in concrete. Standard ratios ensure proper strength and workability. M15 (1:2:4) is for general construction while M20 (1:1.5:3) provides higher strength.
The calculator uses standard mix ratios:
M15 Grade: 1 part cement : 2 parts sand : 4 parts aggregate
M20 Grade: 1 part cement : 1.5 parts sand : 3 parts aggregate
Calculation: Based on your cement quantity, the calculator multiplies by the ratio factors to determine required sand and aggregate.
Details: Correct ratios ensure concrete has adequate strength, durability, and workability. Improper ratios can lead to weak structures or wasteful material use.
Tips: Select your desired concrete grade (M15 or M20) and enter cement quantity in kg. The calculator will show required sand and aggregate quantities.
Q1: What's the difference between M15 and M20?
A: M15 has lower strength (15 MPa) than M20 (20 MPa). M20 uses less sand and aggregate per cement unit for higher strength.
Q2: Can I use this for large construction projects?
A: These are standard ratios for small projects. Large projects require precise mix designs from engineers.
Q3: Should I account for water in the ratio?
A: Water-cement ratio (typically 0.4-0.6) is separate. This calculator focuses on dry material ratios.
Q4: How accurate are these ratios?
A: They provide good estimates for small projects. Actual requirements may vary based on material quality and site conditions.
Q5: What if I need a different grade?
A: Consult engineering specifications for non-standard grades like M25 or M30 which have different ratios.