Construction Calculator
Concrete Calculator
Calculate the volume of concrete needed and how many bags of cement to buy for your project.
Concrete Mix Ratios
Standard concrete mix (M20): 1 part cement : 1.5 parts sand : 3 parts aggregate. For M15: 1:2:4. For foundation work, M25 or higher is recommended. This calculator uses M20 as default.
How Many Bags Do I Need?
For M20 concrete: approximately 8 bags of 50 kg cement per cubic meter. Add 10–15% extra for wastage. For exact quantities, consult a structural engineer for large projects.