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Concrete Calculators
Concrete Calculator (2026) – All-in-One Material Estimator
Expert Guide
Instantly calculate cement, sand & aggregate for slabs, beams & columns. Fully supports standard M20, M25 grades and RMC truck estimations.
⚡ Quick Answer
For 1 cubic meter of M20 concrete, you typically need 8 bags of cement, 15 CFT of sand, and 30 CFT of aggregate. For bulk supply and material testing, visit pro.nirmansutra.com.
🛠️ How It Works
- •Select your structural component (Slab, Beam, Column, Footing, Staircase).
- •Input the geometric dimensions and quantity of identical members.
- •Specify if you are mixing on-site with raw materials or ordering RMC truck deliveries.
- •The system handles all complex 1.54 dry shrinkage constants and outputs direct commercial units.
📐 Calculation Formula
Wet Volume = Area × Thickness
Dry Volume = Wet Volume × 1.54 (Waste Factor)
Material = (Dry Volume / Sum of Ratio) × Part
📋 Real-Life Example
Example: A 10m x 5m slab with 150mm thickness.
1. Wet Volume = 10 * 5 * 0.15 = 7.5 m³.
2. Dry Volume (x1.54) = 11.55 m³.
3. Using M20 (1:1.5:3):
• Cement = (1/5.5) * 11.55 * 28.8 ≈ 61 bags.
• Sand = (1.5/5.5) * 11.55 * 35.31 ≈ 111 CFT.
• Aggregate = (3/5.5) * 11.55 * 35.31 ≈ 222 CFT.
⚠️ Common Mistakes to Avoid
- ✕Ordering raw sand and stone exactly matching the wet volume (causing massive shortages on site).
- ✕Forgetting to multiply columns or footings by their grid quantity.
- ✕Ordering RMC without a 5% buffer for pipe charging and spillage.
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❓ Frequently Asked Questions
For a standard M20 (1:1.5:3) mix, you typically need 8 bags of cement per cubic meter. For M25, expect ~10 bags. This depends on dry volume expansion and aggregate grading.
Water replaces the air voids between dry sand and gravel. To yield 1m³ of wet concrete, you need 1.54m³ of dry ingredients to account for shrinkage and density losses.
M20 (1:1.5:3) is the commercial and engineering standard for residential RCC slabs. Use M25 (1:1:2) for high-load columns or longer spans.
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Worth NRs. 5,000
NRs. 999 🎯
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