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Gravel Base Layer Tonnage Calculator

Estimate the tonnage of crushed stone or gravel base needed for a pavement or slab sub-base layer.

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 2026-08-27 · v1.1.0

Market
Imperial · sales tax

Gravel base needed

56.22 tons

Check your inputs

Actual density varies by material gradation and compaction — confirm with your supplier's specific product density for a precise order quantity.

Volume
39.24 yd³
Equivalent in US (short) tons
56.22 tons

For the dimensions entered, expect a gravel base needed of 51 metric tons. Note that base area sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Moderate confidence — sound arithmetic, but allow for the variation any real site introduces. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

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

  • Mass = area x thickness x compacted material density; compacted crushed stone base typically weighs 1,600-1,900 kg/m³ (100-120 pcf)

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why does gravel density vary so much between projects?
It depends on the stone's gradation (particle size mix), angularity, and how well it's compacted — a well-graded crushed stone compacts denser than uniform round gravel.
Should I order extra for waste?
A small margin (5-10%) is reasonable for spillage and minor over-excavation, though this calculator doesn't build in a waste factor by default since base layers are usually measured more precisely than surface materials.
Does compacted thickness differ from the loose delivered thickness?
Yes — loose gravel compacts down noticeably, often by 15-25% depending on material and compaction effort, so spread loose gravel thicker than your target compacted thickness and compact in lifts.