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Earthwork & Excavation

Excavation Calculator (2026) – Trench, Pit & Soil Volume Master

Expert Guide
Babu

Calculate trench, foundation & bulk excavation volumes with soil swell factors.

Hydraulic excavator digging a foundation trench at a construction site

⚡ Quick Answer

To find excavation volume, multiply Length x Width x Depth. For professional site management and earthwork BOQs, visit pro.nirmansutra.com.

🛠️ How It Works

  • •Select your excavation mode (Pit, Trench, Sloped, or Circular).
  • •Enter dimensions from your site survey in meters.
  • •The tool applies geometry-specific formulas like the Prismoidal rule for sloped pits.
  • •Results provided in both Metric (m³) and Commercial units (CFT).

📐 Calculation Formula

Simple Pit Volume = L × W × D
Circular Vol = π × (D/2)² × H
Swell Volume = Bank Volume × Swell Factor (1.25 for soil)
Backfill Vol = Pit Volume − Structure Volume
Foundation Trench & Excavation Safety Diagram

📋 Real-Life Example

Example: Foundation Pit (5m x 4m) with 1.5m depth. 1. Total Volume = 5 * 4 * 1.5 = 30 m³. 2. In CFT = 30 * 35.31 ≈ 1,059 CFT. 3. Loose Volume (@25% swell) = 37.5 m³.

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❓ Frequently Asked Questions

For standard rectangular pits, multiply Length × Width × Depth. For sloped safety cuts, use the Prismoidal formula to avoid ±15% calculation errors.
Loose excavated soil expand by 25–30%. This "Swell Factor" is critical for planning truck trips and disposal logistics.

Stop Guessing. Start Building.

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Worth NRs. 5,000
NRs. 999 🎯
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