Engineering
Concrete Calculator
Calculate cement, sand, and aggregate for any concrete mix.
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Concrete Calculator
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Formula & Methodology
Volume = Length × Width × (Depth/100)
Dry Volume = Wet Volume × 1.54
Cement = (Cement ratio / Total ratio) × Dry Volume
Sand = (Sand ratio / Total ratio) × Dry Volume
Aggregate = (Aggregate ratio / Total ratio) × Dry Volume
Cement Bags = Cement Volume (m³) / 0.035
Dry Volume = Wet Volume × 1.54
Cement = (Cement ratio / Total ratio) × Dry Volume
Sand = (Sand ratio / Total ratio) × Dry Volume
Aggregate = (Aggregate ratio / Total ratio) × Dry Volume
Cement Bags = Cement Volume (m³) / 0.035
About Concrete Calculator
Our concrete calculator helps civil engineers, contractors, and homeowners calculate the exact quantities of cement, sand, and aggregate needed for any concrete project.
Frequently Asked Questions
Volume = Length × Width × Thickness (all in meters for cubic meters, or feet for cubic feet). Always add 5-10% for wastage. For a 5m × 4m × 0.1m slab: Volume = 2 m³, plus 10% wastage = 2.2 m³.
M20 (most common for slabs/beams): 1 part cement : 1.5 parts sand : 3 parts aggregate (water/cement ratio ≈ 0.5). M15 (lean mix) for light applications: 1:2:4. M25 for heavy-duty/structural: 1:1:2.
For M20 mix, approximately 7-8 bags of 50kg cement per cubic meter of concrete. For M15 mix, approximately 5-6 bags. Use our concrete calculator to get precise quantities for your specific mix and volume.
Curing is the process of maintaining adequate moisture and temperature in freshly placed concrete to ensure proper hydration and strength development. Poor curing can reduce concrete strength by up to 30%. Moist cure for at least 7 days; 28 days for full strength.
Cement is one ingredient in concrete. Concrete is a composite mixture of cement (binder), sand (fine aggregate), gravel/crushed stone (coarse aggregate), and water. Cement typically makes up only 10-15% of concrete by volume.
Volume = π × r² × height, where r is the radius. For a column 0.3m diameter × 3m tall: r = 0.15m, V = π × 0.0225 × 3 = 0.212 m³. Add 5% for wastage.
RMC is delivered pre-mixed in transit mixers, ensuring consistent quality, saving labor, reducing wastage, and speeding up construction. Preferred for large volumes. For small projects, site mixing is more economical.
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