Cement Concrete Calculator

Cement Concrete Calculator: Wet/Dry & Multi-Element Bill

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Cement Concrete Calculator: Forward & Reverse (Wet/Dry) — Namespaced

Cement Concrete Calculator — Forward & Reverse (Wet/Dry)

Estimate mix quantities from dimensions or start from a known concrete volume (wet or dry). Accurate batching logic with dry‑volume factor, wastage, W/C, bag count, costs, and a clear note for M25+ design mixes per IS 456.

Accuracy note for grades: IS 456:2000 allows nominal mixes (e.g., 1:3:6 ≈ M10, 1:2:4 ≈ M15, 1:1.5:3 ≈ M20). For M25 and above, design mix is required (no fixed nominal ratio). Use lab/field trial proportions for M25, M30, M35, M40. The calculator lets you enter custom ratios for these grades.
Ref: IS 456:2000 — Nominal vs Design Mix guidance.

Choose Mode

Current Volume Preview: 2.25 m³

Grade, Mix & Materials

Suggested defaults: M20 ≈ 0.50, M25 ≈ 0.50, M30 ≈ 0.45, M35 ≈ 0.42, M40 ≈ 0.40 (adjust by workability/site practice). Current: 0.50
Accounts for voids/bulking in dry materials (typ. 1.52–1.57)

Results

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Concrete Volume (wet)

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Dry Volume (for batching)

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Cement Bags

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Water (litres)

Mix Proportions (with water)

Cement Sand Aggregate Water

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Cement (m³ / kg)

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Sand (m³)

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Aggregate (m³)

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Cement Cost

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Sand Cost

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Aggregate Cost

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Total Cost

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What this Calculator Is — and How It Works

This tool helps you estimate concrete materials either from dimensions (length × width × thickness) or from a known concrete volume (wet or dry). It converts your inputs into dry-batched quantities for cement, sand, and aggregate, plus water via W/C, and even bag counts & costs.

How it works (in simple steps)

1
Choose your mode. Use By Geometry for slabs/beams/columns via dimensions, or By Concrete Volume if you already know the total quantity (wet or dry).
2
Pick grade & mix. M10/M15/M20 use nominal mixes (1:3:6, 1:2:4, 1:1.5:3). For M25 and above, enter your design mix (no fixed nominal ratio per IS 456).
3
Wet ⇄ Dry conversion. The calculator multiplies the wet volume by a Dry Volume Factor (typically 1.52–1.57) and optional wastage to get the dry-batched volume.
4
Split by mix parts. Dry volume is divided into cement, sand, and aggregate using the selected C:S:A ratio.
5
Compute water & bags. Water is estimated via the Water–Cement (W/C) ratio by mass; cement volume converts to mass with density (default 1440 kg/m³) and then to bag count (e.g., 50 kg).
  • Use Reverse mode when you have a supplier order (e.g., 4.5 m³ wet) and need batching quantities.
  • Use the Bill (Multi) tab to sum many elements and get grand totals for a project.
  • Adjust W/C for workability and strength requirements; lower W/C usually means higher strength (with proper compaction & curing).
Standards note: Nominal mixes are common up to M20. For M25, M30, M35, M40, IS 456:2000 recommends design mix based on trials; enter your lab/field proportions. Ref: IS 456:2000 — Nominal vs Design Mix guidance.

Wet vs Dry volume — quick demo

Move the slider to see how dry-batched volume compares for a 1.00 m³ wet pour.

1.00 m³

Wet Volume (as placed)

1.54 m³

Dry Volume (for batching)

Dry volume is higher because loose materials have voids/bulking; mixing & compaction reduce these voids in the final concrete.

  • Estimates assume sound batching, proper compaction, and curing.
  • W/C is a guide; actual water demand varies with aggregate moisture and workability.
  • For M25+, use your design mix ratios from trials; the tool doesn’t fix a nominal mix.
  • Always consult a qualified engineer for structural design decisions.
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