Limestone Calculator

Extra material covers small dips, settling, spillage, and measurements that are not perfectly square. The calculated amount remains visible so you can compare both figures.

Both are shown. “Calculated” bags cover the measured volume; “Order” bags include the 10% allowance and round partial bags up to whole bags.

Volume comes directly from your dimensions. Weight is a range because moisture, particle size, composition, and compaction change bulk density.

Limestone is a common sedimentary rock composed primarily of calcium carbonate (CaCO₃), chiefly in the form of the mineral calcite. It forms over millions of years from the accumulation of shell fragments, coral, algal debris, and chemical precipitation in shallow marine waters.

To calculate crushed limestone: measure your area length and width in feet, multiply them for square footage, multiply by depth in feet (depth in inches ÷ 12), and divide by 27 to find cubic yards. Multiply cubic yards by 1.3 to 1.4 to determine total tons needed (e.g., #57 limestone runs ~2,600 lb/yd³; crusher run runs ~2,800 lb/yd³). Add 10% to 20% extra for compaction and subgrade settling.

Multiply length (ft) × width (ft) × depth (in ÷ 12) ÷ 27 to get cubic yards, then multiply by 1.35 for estimated tons. For example, a 10×20 ft driveway section (200 sq ft) at a 4-inch depth requires 2.47 cubic yards, which equates to roughly 3.3 to 3.5 tons of crushed limestone base.

Crushed limestone for a driveway or base costs roughly $0.50 to $1.50 per square foot at a 4 inch depth for the material alone, depending on the grade and the haul distance; delivery and spreading are extra.

Bulk agricultural lime (ag lime) typically costs $25 to $50 per ton picked up from a quarry or agricultural cooperative, or $40 to $80 per ton delivered and custom-spread across fields. Bagged pelletized lime costs $4 to $8 per 40 lb bag ($200 to $400 per ton).

In metric terms, crushed limestone base at a 10 cm depth costs roughly $5 to $15 per square metre for bulk material, before delivery.

Limestone is a biological and chemical sedimentary rock. It is formed from organic marine sediments (skeletal fragments of marine organisms) or from the direct chemical precipitation of calcium carbonate from marine and freshwater lakes.

Limestone forms primarily in warm, shallow, calm marine environments where organisms like mollusks, corals, and foraminifera extract calcium carbonate from seawater to build shells and skeletons. When they die, their accumulated skeletal debris is compacted and cemented over geologic time through lithification.

Limestone is made primarily of calcium carbonate (CaCO₃), mainly in the form of calcite and aragonite minerals. It may also contain minor amounts of clay, iron oxide, quartz, silica, feldspar, pyrite, and organic fossil fragments.

Limestone is widely used as crushed stone aggregate for road building, driveway bases, concrete aggregate, asphalt mix, railroad ballast, Portland cement manufacturing, agricultural lime for soil pH remediation, flue-gas desulfurization in power plants, and dimension stone for architectural tiles, flooring, and building facades.

Pure limestone is white, off-white, or light cream. However, trace impurities give limestone a wide spectrum of colors: iron oxides produce yellow, tan, buff, and red shades; carbonaceous organic matter produces gray and deep charcoal/black; and clay minerals produce greenish-gray tones.

#57 limestone is crushed rock screened to uniform 1/2-inch to 1-inch pieces with no fine stone dust. It is open-graded and free-draining, making it the industry standard for French drains, septic lines, retaining wall backfill, and concrete aggregate.

411 limestone (also called crusher run or 3/4-inch minus) is a dense-graded blend of 3/4-inch crushed stone down to fine limestone dust. The fine particles fill all voids between stones, enabling it to compact into an extremely hard, stable base for driveways and pavers.

304 limestone (and 2A limestone) are dense-graded road base specifications containing 1.5-inch to 3/4-inch stones blended with fines for maximum compaction. 2B limestone is a clean, uniform aggregate (roughly 3/4-inch clean, equivalent to #57) without fines used for drainage and uncompacted top dressing.

610 limestone (common in the Southeast US) and 21AA limestone (standard DOT spec in Michigan and the Midwest) are dense-graded aggregate blends of 3/4-inch to 1.5-inch crushed limestone with fines, designed specifically for highway sub-bases, heavy parking lots, and long-lasting gravel driveways.

“Type 1” usually means MOT Type 1, the UK highways specification for a crushed sub-base: angular stone from about 1½ in (40 mm) down to dust, which compacts hard under a plate compactor. In the US the closest equivalents are crusher run, #411, 304, 2A, and 21AA. Pick the crusher run option in the calculator above for its weight range, and order the loose figure the compaction row shows.

Liquid limestone is a poured-in-place decorative paving mixture made from crushed limestone aggregate, white cement, and specialized polymers. It creates a seamless, durable, cooler-to-the-touch surface popular for swimming pool decks, patios, and outdoor pathways. The concrete calculator sizes a liquid limestone pour.