Backfill Calculator
Foundation Backfill
Calculate backfill volume around a foundation (total excavation minus foundation footprint)
Trench Backfill
Calculate backfill volume for a utility trench after pipe installation
Formula
Backfill = Excavation Volume - Structure Volume | Order Qty = Backfill × Compaction Factor
Frequently Asked Questions
What material should I use for backfill?
For structural backfill around foundations, use clean gravel or engineered fill. For utility trenches, gravel bedding is placed around the pipe, then native soil can be used above. Never use organic soil, debris, or frozen material as backfill. Check local building codes for specific requirements.
Why do I need extra material for compaction?
Loose fill material compresses when compacted, reducing in volume by 15-30% depending on the soil type. You need to order extra material to account for this volume reduction. Gravel compresses about 15%, while clay may compress up to 30%.
You may also need
~
Excavation Volume Calculator
Free excavation volume calculator. Calculate the volume of soil to be excavated for foundations, trenches, ponds, and general earthwork in cubic yards.
Everyday~
Soil Compaction Calculator
Free soil compaction calculator. Calculate compaction percentage, required fill volume, and loose-to-compacted soil conversions for construction earthwork.
Everyday~
Aggregate Calculator
Free aggregate calculator. Calculate how much gravel, crushed stone, road base, or fill material you need in tons and cubic yards for construction projects.
Everyday