What this granite aggregate calculator returns
Quick answer: Estimate cubic yards, short tons, bags, and material cost for a rectangular layer of crushed or decorative granite aggregate.
Identify the product before measuring: decomposed granite, crushed granite base, and decorative granite chips may use different depths, densities, and installation methods. Calculate each layer separately.
Formula used by the calculator
Installed cubic feet = length × width × (depth in inches ÷ 12)
Installed cubic yards = cubic feet ÷ 27
Base short tons = cubic yards × density for the same material state
Recommended short tons = base short tons × (1 + stated allowance ÷ 100)
Granite source basis: unit conversions follow NIST. The USGS aggregates program supports crushed-stone terminology. Product form is explicit because decomposed granite, crushed aggregate, and decorative chips compact and drain differently; supplier density overrides each planning preset. Method and limits.
On the Granite Aggregate Calculator, estimated cost equals recommended short tons multiplied by the entered price per ton. Bag count converts recommended tons to pounds, divides by the selected bag weight, and rounds upward. Coverage is length multiplied by width; depth is still required before area becomes volume.
Density is an editable conversion, not a universal constant
The page opens with 1.65 short tons per cubic yard as an example density for granite aggregate. Granite aggregate is not the same as a solid countertop or dimension-stone slab. Gradation, fines, moisture, stabilization, and compaction affect the loose bulk relationship between cubic yards and tons.
If a supplier provides a different tons-per-yard figure, first check whether it describes the installed layer or loose delivered granite aggregate. Use it directly only when the material states match; otherwise obtain a documented yield conversion. Solid granite density cannot stand in for bulk aggregate with voids between particles.
Worked granite aggregate example
Example values: 24 ft × 10 ft × (3 in ÷ 12) ÷ 27 = 2.22 yd³. At 1.65 short tons/yd³, base weight is 3.67 short tons; with 8% allowance, the example order is 3.96 short tons. Replace these values with project and supplier data.
Turn the result into an order
Confirm whether the supplier quote is for loose bulk aggregate by ton, by yard, or in bags. For a compacted surface, use the specified installed depth and a defined ordering factor rather than guessing from solid-granite density.
Ask whether the quote is for decomposed granite, coarser crushed granite, or decorative chips. Decomposed granite may also be sold natural, stabilized, or with a separate binder; those products have different installation instructions and should not share one assumed density, yield factor, or allowance.
Common granite aggregate estimating errors
- Using solid granite density for a loose aggregate order.
- Combining decomposed granite and coarse crushed granite in one average layer.
- Forgetting that stabilized products and fines can change both yield and installation procedure.
Questions specific to granite aggregate
Can I use this for a granite countertop?
No. This calculator is for loose granite aggregate. A countertop needs slab dimensions, thickness, cutouts, and fabricator data; use a plate or stone-weight calculation instead.
Is decomposed granite density the same as crushed granite?
Not necessarily. Fines content, moisture, grading, and compaction differ. Use the density supplied for the exact product being delivered.
Should compacted granite be entered at loose or finished depth?
Enter the finished design depth for geometry, then apply only a loose-to-compacted ordering factor supported by the supplier or specification.
How do I compare granite sold by the bag and by the ton?
Use the selected bag weight to convert the recommended tons into whole bags, then compare delivery, pallet, and minimum-order terms in addition to material price.