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Demolition Bulk Volume Swell Calculator

Estimate the bulked (swelled) volume of demolished masonry or concrete debris for hauling, using typical material swell factors.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Estimated bulked (swelled) volume

26 cubic yards

Check your inputs

These are typical demolition-estimating swell factors, not a universal engineering constant — actual bulking varies with the demolition method (mechanical breaking vs. explosive vs. hand demolition) and resulting debris piece size. Use a higher factor for finely broken debris and confirm against your hauler/estimator's experience on similar material.

Swell factor used
1.3 x

With the figures above, the estimated bulked (swelled) volume comes to 26 cubic yards. Note that in-place (pre-demolition) volume (cubic yards) sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. The method behind this is well established, though site conditions and material batches will move it somewhat. This is calculated for United States and cites IRC 2024. Building in another market? Change the selector above so the units and code reference follow.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Bulked volume = In-place volume × Swell (bulking) Factor. Broken masonry and concrete occupy significantly more volume once demolished due to voids created by fracturing — typical swell factors commonly used in demolition estimating: concrete ~1.3x, CMU block ~1.4x, brick masonry ~1.5x, natural stone ~1.5x. These are industry estimating conventions (mirroring the same swell/bulking concept used in this site's Soil Swell & Shrinkage calculator), not a single universal engineering constant — actual swell varies with demolition method and debris size.

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Frequently asked questions

Why does demolished concrete take up more volume than it did intact?
Broken masonry and concrete occupy significantly more volume once demolished because fracturing creates voids and air gaps between the broken pieces — the same material now takes up more space than it did as a solid structure.
Why do different materials have different swell factors?
How much a material bulks depends on how it fractures — concrete (~1.3x), CMU block (~1.4x), and brick masonry or natural stone (~1.5x) each break into different piece shapes and sizes, which pack together with different amounts of void space.
Should I always use the exact factor listed here?
Treat these as industry estimating conventions, not a universal constant. Finely broken debris packs less efficiently and bulks more, so consider a higher factor for heavily fragmented material, and confirm against your hauler or estimator's experience on similar demolition work.