Multiply length × width × depth in feet, divide by 27 for cubic yards, then multiply by 1.55 for tons of crushed limestone. A 20 × 10 ft area at 3 inches deep needs about 1.85 cubic yards — roughly 2.9 tons.
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Order – tons (includes your waste allowance) so compaction and spillage don’t leave you short.
Limestone Calculator Guide
Limestone is the most-quarried rock in America for a reason: it does nearly every aggregate job, from interstate sub-base to garden path, and it does one thing no other common stone does as well — it heals itself. Damp limestone fines slowly re-cement, so a well-built limestone surface gets harder with age and traffic. This calculator converts your dimensions to tonnage at limestone density, 1.55 tons per cubic yard.
“Crushed limestone” is really a family of products screened from the same crusher output, and each size behaves differently. Ordering the right tonnage of the wrong size is the classic limestone mistake, so match the grade to the job before running the numbers.
Which Size of Crushed Limestone Do You Need?
| Grade | Size range | Best use |
|---|---|---|
| Limestone screenings | Dust to 1/4 in | Paver bedding, path topping, barn floors |
| #8 limestone | 1/8–3/8 in | Pipe bedding, asphalt mixes, top dressing |
| #57 limestone | 1/2–1 in | Driveway surfaces, drainage, concrete work |
| #4 limestone | 1–2.5 in | Heavy-duty sub-base, entrance stabilization |
| #2 limestone | 2.5–4 in | Construction access roads, deep mud remediation |
| Dense-graded (with fines) | 3/4 in to dust | Compacted structural bases |
Weight stays near 1.55 tons per cubic yard across the family, so tonnage math does not change with grade — a ton covers about 105 square feet at 2 inches and 70 square feet at 3 inches whichever size you pick.
Why Limestone Locks Up — and How to Use That
Limestone is calcium carbonate, and its crusher dust is chemically active: wetted and compacted, the fines dissolve microscopically and re-precipitate where particles touch, knitting the layer together. That is why a limestone lane that sees rain and traffic develops a hard, almost paved crust within a season, while a granite gravel lane stays loose indefinitely. To encourage it, compact the material damp and let the surface cure through a few wet-dry cycles before heavy use.
The same chemistry brings one caution: limestone is mildly alkaline, and runoff or migrating fines gradually raise soil pH at the edges. Acid-loving plantings — azaleas, rhododendrons, blueberries — do better bordered by neutral stone, with the limestone kept to drives and paths.
For a compacted limestone foundation under pavers or a shed, the limestone base calculator adds the right compaction allowance, and the general crushed stone calculator covers projects where the quarry rock happens to be granite or trap instead.
Frequently Asked Questions
How much does a cubic yard of limestone weigh?
Crushed limestone runs about 1.55 US tons (3,100 lb) per cubic yard — among the heavier common aggregates, because limestone crushes into dense, tightly packing particles with plenty of fines.
Why is crushed limestone so widely used?
It is abundant across most of the US, crushes into sharp angular pieces that lock together, and its dust binds when damp — a limestone drive gradually firms into a near-solid surface. The light gray color also brightens driveways and paths.
How much area does a ton of limestone cover?
About 105 square feet at 2 inches deep, 70 square feet at 3 inches, and 52 square feet at 4 inches. It covers slightly less than general crushed stone per ton because it packs about 3% denser.
Is limestone better than gravel for a driveway?
For the structural layers, usually yes — angular limestone with fines compacts into a firm crust that rounded gravel never forms. Gravel wins on looks and drainage as a top dressing, which is why many driveways use limestone below and washed stone above.