Stone Weight Calculator
Enter dimensions and density to calculate stone weight.
Stone Weight Formula
Understanding Stone Weight
Stone Weight by Rock Type
The term "stone" in construction covers a wide range of quarried rock products, each with a distinct weight determined by its mineral composition and porosity. Dense igneous rocks like granite and basalt weigh more per cubic yard than sedimentary rocks like limestone or sandstone. Within each rock type, the processing method — crushed vs. natural round — also affects weight because crushed stone packs tighter than rounded stones of the same size.
| Stone Type | Tons per Cubic Yard | Lbs per Cubic Yard | Typical Applications |
|---|---|---|---|
| Crushed Stone (#57) | 1.40 | 2,800 | Driveways, drainage, sub-base |
| Crushed Granite | 1.45 | 2,900 | Driveways, pathways, decorative |
| Crushed Limestone | 1.50 | 3,000 | Sub-base, agriculture, pH correction |
| Bluestone | 1.55 | 3,100 | Patios, walkways, flagging |
| Sandstone (crushed) | 1.30 | 2,600 | Decorative, pathways |
| Basalt / Trap Rock | 1.60 | 3,200 | Railroad ballast, heavy-duty base |
| Fieldstone | 1.35 | 2,700 | Walls, borders, decorative |
| Slate Chips | 1.45 | 2,900 | Mulch alternative, pathways |
Why Stone Size Affects Weight per Cubic Yard
Larger stones leave bigger air gaps between pieces, reducing the overall weight per cubic yard of loose material. A cubic yard of 4-inch cobblestones might weigh 2,200 lbs, while the same volume of 3/4-inch crushed stone weighs 2,800 lbs because the smaller pieces fill gaps more efficiently. Crusher run — a mix of stone dust and small crushed rock — packs the tightest at 1.55 tons per cubic yard because the dust fills nearly every void.
When comparing stone products, always specify both the rock type and the size gradation. "#57 stone" (3/4 to 1 inch) weighs differently than "#2 stone" (2.5 to 4 inch) even when both come from the same quarry.
Structural Weight Requirements
Engineers specify stone for structural applications by weight because compaction testing is weight-based. A highway sub-base requires crushed stone compacted to 95% of its maximum dry density (Modified Proctor test). A residential driveway base uses a similar standard at 90–95%. These densities translate directly to weight per volume — if the compacted stone doesn't meet the weight target, the base will settle over time.
For retaining walls with stone backfill, the lateral earth pressure calculation uses the unit weight of the backfill material. Using granite backfill (1.45 t/yd³) vs. sandstone (1.30 t/yd³) changes the wall's required reinforcement. Always use material-specific weights rather than generic averages in structural calculations.
Delivery Logistics and Load Planning
Stone is among the heaviest bulk landscape materials. A tandem dump truck carrying crushed limestone at 1.5 tons per cubic yard hits its 14-ton payload limit at about 9 cubic yards — well below its 12-yard bed volume. This means you pay for a full truck but receive a partial load by volume. Factor this into your budgeting: delivery charges are per-trip, not per-ton.
- Tandem dump: 8–10 yd³ of most crushed stone (weight-limited).
- Single-axle dump: 3–4 yd³ of crushed stone.
- Transfer dump: 15–20 yd³ for large projects (separate tractor and pup trailer).
Stone Weight FAQ
It depends on the rock type and size. Crushed stone (#57) averages 1.4 tons (2,800 lbs) per cubic yard. Crushed granite is about 1.45 tons (2,900 lbs), crushed limestone is 1.5 tons (3,000 lbs), and dense basalt or trap rock can reach 1.6 tons (3,200 lbs). Larger stone sizes weigh less per cubic yard because of increased void space between pieces.
Per cubic yard, yes. Crushed stone has angular surfaces that interlock and pack tighter than rounded natural stones, leaving fewer air voids. This higher packing density means more stone and less air per cubic yard, resulting in greater weight. Crusher run (a crushed stone/dust blend) weighs up to 1.55 tons/yd³ compared to 1.35 tons/yd³ for rounded fieldstone.
Measure the wall length, height, and thickness in feet. Multiply all three to get cubic feet, then divide by 27 for cubic yards. Multiply cubic yards by the stone density (typically 1.4–1.5 tons/yd³ for wall stone). For example, a wall 20 ft long × 3 ft high × 1.5 ft thick = 90 cu ft ÷ 27 = 3.33 cubic yards × 1.45 t/yd³ = 4.83 tons of stone needed.
Among common construction stones, basalt (trap rock) is the heaviest at 1.6 tons per cubic yard. Bluestone follows at 1.55 tons/yd³, then crushed limestone at 1.5 tons/yd³. Sandstone is the lightest common stone at 1.3 tons/yd³ due to its porous grain structure.
A typical single-car driveway (10 ft × 50 ft × 4 inches deep) needs about 6.2 cubic yards of stone, which weighs 8.7 tons of crushed stone at 1.4 t/yd³. A double-wide driveway (20 ft × 50 ft × 4 in) doubles to 12.3 cubic yards or 17.3 tons. Use our calculator above for exact quantities based on your dimensions.