Stone Weight Calculator
Convert between volume and weight for aggregate stone and dimensional stone. Use area and thickness for slabs or pavers, volume for bulk piles, or weight for reverse lookup. Aggregate stone uses loose bulk densities, while dimensional stone uses solid densities with no voids. The quantity multiplier helps when several stones share the same dimensions.
Results
Aggregate densities (gravel, crushed stone, river rock, decomposed granite, rip rap) are loose bulk values for delivered material. Dimensional densities (granite, marble, quartz, slate, and others) are solid values for cut slabs and dimensional work with no voids. For compacted aggregate base course ordering (road base, recycled concrete, recycled asphalt, crushed granite), use the Road Base Calculator, which uses compacted in-place densities. Custom density lets you enter a value quoted by your supplier for any material.
How to use this calculator
- 01Pick an input mode: area times thickness for slabs and pavers, volume direct if you already know cubic footage, or weight direct for reverse lookup from a known weight.
- 02Pick a material: 7 aggregate types (gravel, crushed stone, river rock, and others) or 9 dimensional types (granite, marble, quartz, slate, and others), or use custom density for a supplier-quoted value.
- 03Enter your dimensions for area times thickness mode (length, width, thickness for rectangular; diameter and thickness for circular), or enter volume or weight directly for the other modes.
- 04Set the quantity if you have multiple stones of the same dimensions. The calculator multiplies the per-stone result by quantity.
- 05Read total volume, weight in pounds, and weight in tons in the results panel. Toggle imperial or metric to switch units.
Understanding the math
Stone weight calculation is volume times density. Volume comes from your input mode: length times width times thickness for rectangular slabs, pi times radius squared times thickness for circular slabs, or direct cubic feet for bulk piles. Density depends on material type and category. Aggregate densities are loose bulk values, similar to delivered material before compaction. Dimensional densities are solid values for cut slabs with no voids. Multiply by quantity for multiple stones of the same dimensions.
Volume (ft³) = length × width × thickness (rectangular) Volume (ft³) = π × (diameter / 2)² × thickness (circular) Total volume = volume × quantity Weight (lbs) = total volume × density Weight (tons) = lbs / 2000
For 4 granite slabs each measuring 6 ft × 3 ft × 0.25 ft (3 inch thickness): volume per slab is 6 × 3 × 0.25 = 4.5 ft³. Total volume for 4 slabs: 4.5 × 4 = 18 ft³. Granite density is 165 lb/ft³. Total weight: 18 × 165 = 2,970 lbs (1.49 tons). Round up to whole tons when sourcing.
Stone density reference
Densities for 16 stone types, 7 aggregate and 9 dimensional. Aggregate values are loose bulk densities for delivered material; dimensional values are solid densities for cut slabs with no voids. The density column flips with the unit toggle between lb/ft³ and kg/m³.
| Material | Type | Density | Common use |
|---|---|---|---|
| Pea Gravel | Aggregate (loose) | 95 lb/ft³ | Walkways, decorative beds |
| Crushed Stone | Aggregate (loose) | 100 lb/ft³ | Driveway base, subbase |
| Crushed Stone #57 | Aggregate (loose) | 100 lb/ft³ | Foundation drainage, subbase |
| Standard Gravel | Aggregate (loose) | 105 lb/ft³ | Driveways, French drains |
| River Rock | Aggregate (loose) | 110 lb/ft³ | Decorative landscape, dry creeks |
| Rip Rap | Aggregate (loose) | 110 lb/ft³ | Erosion control, slope protection |
| Decomposed Granite | Aggregate (loose) | 115 lb/ft³ | Paths, decorative ground cover |
| Quartz | Dimensional (solid) | 144 lb/ft³ | Engineered countertops |
| Sandstone | Dimensional (solid) | 145 lb/ft³ | Pavers, dimensional cladding |
| Travertine | Dimensional (solid) | 150 lb/ft³ | Pavers, indoor flooring |
| Limestone | Dimensional (solid) | 155 lb/ft³ | Pavers, cladding, monuments |
| Granite | Dimensional (solid) | 165 lb/ft³ | Slabs, countertops, monuments |
| Quartzite | Dimensional (solid) | 165 lb/ft³ | Countertops, slabs |
| Bluestone | Dimensional (solid) | 165 lb/ft³ | Pavers, treads, caps |
| Marble | Dimensional (solid) | 170 lb/ft³ | Slabs, countertops, decorative |
| Slate | Dimensional (solid) | 175 lb/ft³ | Roofing, flooring, hearth |
Frequently asked questions
How much does a stone weigh?
It depends on what kind of stone and what size. As a material, a single stone's weight depends on its volume and density. A 1 cubic foot piece of granite weighs about 165 pounds. The same volume of pea gravel weighs about 95 pounds. As a UK unit of weight, a stone equals 14 pounds. This calculator handles the material reading. Enter dimensions and stone type to get exact weight for your project.
How do you calculate stone weight?
Multiply volume by density. Volume comes from your stone's dimensions: length times width times thickness for rectangular slabs, or pi times radius squared times thickness for circular slabs. Density depends on stone type. Granite runs around 165 lb/ft³, aggregate stone like gravel and crushed stone runs 95 to 115 lb/ft³. The calculator above runs this math for any of 16 stone types across rectangular and circular shapes. For multiple stones of the same dimensions, the quantity multiplier scales the result.
How much does 1 cubic foot of stone weigh?
It depends on stone type. Aggregate stone runs 95 to 115 lb/ft³: pea gravel at 95, crushed stone at 100, river rock at 110, decomposed granite at 115. Dimensional stone runs heavier: quartz at 144 lb/ft³, sandstone at 145, granite and quartzite at 165, marble at 170, slate at 175 lb/ft³. The calculator above gives an exact figure for your selected material.
How do I convert weight to volume for stone?
Use Mode 3 (Weight direct) on the calculator above. Enter your weight in tons or pounds, select your stone type, and the calculator returns the equivalent volume in cubic feet and cubic yards. The math is weight divided by density. For example, 1 ton of granite (2000 lbs / 165 lb/ft³) equals about 12.1 cubic feet, or roughly 0.45 cubic yards.
Related calculators
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Cubic yards, tons, and bag count for driveways, French drains, walkways, and landscape work. Six gravel types plus custom density.
Crushed Stone Calculator
Tons, cubic yards, bag count, and coverage area for driveway bases, foundation drainage, subbase work, and backfill. ASTM D448 size grades.
Road Base Calculator
Compacted aggregate base course for driveways, parking lots, and sub-base under slabs. Standard ABC, RCA, RAP, and crushed granite material options.
Rip Rap Calculator
Tons and yards for engineered rip rap in channel lining, slope protection, and bank stabilization work. NRCS / USACE class system.
River Rock Calculator
Tons, cubic yards, and coverage for decorative river rock. Application presets for decorative beds, dry creeks, ground cover, and drainage.