Use this free online calculator to determine the correct amount of cement, sand, and aggregate required for any concrete project. Just enter the dimensions and choose the concrete grade (M15, M20, M25) to get instant results!
Formula for Concrete Volume
Concrete Volume (m³) = Length × Width × Height
Mix Ratio Example (M20): 1 : 1.5 : 3 (Cement : Sand : Aggregate)
About This Calculator
The Cement, Sand & Aggregate Calculator is an essential tool for civil engineers, architects, contractors, and homeowners involved in concrete work. It provides accurate estimations based on standard concrete grades such as M15, M20, and M25.
This calculator simplifies the process of determining the volume of cement (in cubic meters and bags), sand, and coarse aggregate required for any concrete surface—be it a floor, beam, column, or slab. The calculated quantities are based on the dry volume of concrete, which includes an additional 54% for bulking and wastage.
For example, if you’re constructing a slab of 4m × 3m × 0.15m using M20 concrete, this tool will help you estimate how many cement bags you need (typically 50 kg per bag), and how much sand and aggregate should be purchased to complete the job efficiently.
Whether you’re building a home foundation, driveway, or garden patio, using the correct concrete mix and materials is crucial for the durability and strength of the structure. This calculator reduces the risk of under- or over-ordering materials, helping you save money and time.
This tool is ideal for small construction jobs, home renovation projects, and learning purposes in engineering and construction education.
🔍 What Are M15, M20, and M25 Concrete Grades?
In civil engineering, “M” stands for Mix, and the number following it indicates the characteristic compressive strength of concrete after 28 days of curing, measured in megapascals (MPa) or N/mm².
🧱 1. M15 Concrete
- Mix Ratio: 1:2:4 (Cement : Sand : Coarse Aggregate)
- Strength: 15 MPa (15 N/mm²)
- Use Case:
- Ideal for non-structural work
- Used in pavements, flooring, and footpaths
- Not recommended for load-bearing structures
🧱 2. M20 Concrete
- Mix Ratio: 1:1.5:3
- Strength: 20 MPa (20 N/mm²)
- Use Case:
- Most common grade for residential construction
- Suitable for beams, columns, and slabs
- Balances strength and cost effectively
🧱 3. M25 Concrete
- Mix Ratio: 1:1:2
- Strength: 25 MPa (25 N/mm²)
- Use Case:
- Used for structural work in commercial or multi-story buildings
- Suitable for heavy-duty floors, foundation, and industrial structures
- Higher cement content = more durable and stronger
🔧 Summary Table:
| Grade | Mix Ratio | Strength (MPa) | Common Use |
|---|---|---|---|
| M15 | 1 : 2 : 4 | 15 MPa | Non-load bearing work, pathways |
| M20 | 1 : 1.5 : 3 | 20 MPa | Residential slabs, beams |
| M25 | 1 : 1 : 2 | 25 MPa | Structural foundations, columns |