Trench Backfill Calculator
Separate excavation, pipe displacement, bedding and loose backfill quantities for a simple trench.
What would you like to do next?
Show the main trench volume components separately
Enter trench length, width, average depth, pipe outside diameter, bedding depth and a loose-volume allowance. The calculator builds a rectangular excavation envelope, subtracts cylindrical pipe displacement and the bedding layer, then reports compacted backfill space and its corresponding loose planning volume.
Confirm zones and material factors from the project specification
Manholes, fittings, multiple services, trench shields, side slopes and variable depth change quantities. Pipe embedment can include haunch and surround requirements not represented by one bedding layer. Apply actual profiles, specified material zones, compaction tests, reuse rules and disposal classifications.
Frequently asked questions
Is pipe displacement treated as a cylinder?
Yes. It uses entered outside diameter across the trench length.
Is bedding part of backfill?
It is shown separately and subtracted from general backfill space.
Does the tool calculate truck loads?
No. It reports cubic-metre quantities only.