Expert Guide

Babu

Earthwork & Excavation

Soil Backfilling Calculator – Compaction Index

Quality Inspector

Kaka

Estimate soil needed to fill foundation pits.

📐 Formula & Method

Net Fill = Pit Vol - Structure Vol. Loose Soil = Net Fill × Compaction Factor.

Loose Soil = (PitVol - StructVol) × Factor

📋 Worked Example

10m³ pit with 2m³ footing (1.3 factor):
• Net Fill = 8 m³
• Loose Soil = 10.4 m³

❓ Frequently Asked Questions

What is backfilling?

The process of putting soil back into a trench or around a foundation after the primary work is done.