Crushed stone weight

Two patterns run through the chart. Single-size clean stone — #2, #57, #8 — all lands near 100 lb/ft³ regardless of particle size, because the void ratio between uniform particles barely changes with scale. And anything carrying fines — crusher run, dense-graded base — jumps 25% heavier because the fines occupy the voids. Size ranges for each product are decoded in the crushed stone sizes guide.

Compaction removes air, not stone: a ton stays a ton, but it occupies about 9% less volume for clean #57 and 12% less for crusher run. The practical consequence is that a base layer specified at 4 inches compacted consumes more material than 4 loose inches would suggest — plan on ordering 15–20% extra (compaction shrinkage plus normal waste) to finish at the designed depth.

Geology moves the numbers about 10%. Crushed limestone, the most common quarry rock east of the Rockies, runs about 1,550 kg/m³ (97 lb/ft³) loose. Granite is denser at roughly 1,650 kg/m³ (103 lb/ft³), and trap rock — basalt and diabase, common in the Northeast — is heavier still. Lightweight outliers exist too: recycled concrete aggregate runs about 1,450 kg/m³ because the old mortar is porous. Unless you are ordering hundreds of tons, the gradation (clean vs dense-graded, loose vs compacted) dominates the calculation and the rock type is a rounding adjustment — the full list is in the gravel density database.