How the Backfill & Compaction works
Loose fill required = Compacted volume × compaction factor.
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the compacted volume, shrinkage.
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Backfill around foundations and plinth filling.
Assumptions & limitations
Results are planning estimates based on standard assumptions for earthwork & site work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Backfill & Compaction work?
- Loose fill required = Compacted volume × compaction factor.
- Can I use the Backfill & Compaction in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Backfill & Compaction?
- Backfill around foundations and plinth filling.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: backfill calculator, compaction factor, fill material quantity.
