DIY
How Many Bags of Concrete Do You Need?
Calculate the number of 60-lb or 80-lb concrete bags for posts, slabs, and small projects.
In this article
Calculation
1 m³ M20 concrete: ~8 bags cement (50 kg each)। 1 bag cement: 0.035 m³ concrete। Cost: ₹350-400/bag। UltraTech, ACC, Ambuja, Shree: top brands। For 1 m³: 8 bags cement + 0.42 m³ sand + 0.83 m³ aggregate = ₹5,000-7,000 (manual mix)।
RMC vs Manual
RMC: ₹4,000-6,000/m³ (better quality, less waste)। Manual: ₹3,500-5,000/m³ (flexible, small quantities)। Above 2 m³: RMC economical।
⚡ CalcWolf Insight
For fence post holes, you can pour dry bag concrete directly into the hole around the post and add water on top — it cures underground. This "dry pour" method is faster than pre-mixing, though pre-mixed is stronger. For structural posts (deck, pergola), always pre-mix.
Frequently asked questions
1 m³ कितने bags?▾
M20: ~8 bags (50 kg)। M25: ~9 bags।
RMC or manual?▾
Small (<2 m³): manual। Large: RMC (better quality, less labor)।
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