How this limestone calculator works
Crushed limestone sells over a scale, so the estimate is volume × density with the gradation setting the density:
tons = yd³ × 1.35 (#57) × (1 + waste%) → rounded up to ¼ ton
At the defaults — a 20 × 10 ft pad, 3 in of #57, 5% waste — the scale order is 2.75 tons, about $110 bulk; the full chain is in the load math section below.
Limestone gradations and what each is for
“Crushed limestone” comes in a size ladder from powder to boulders, and the size decides the job — pick by function, and the density preset follows:
- Screenings (dust) — 1.4 t/yd³: the powder-to-⅛ in fines that pack near-solid. The setting bed under pavers and flagstone, and a hard-packing path topping.
- #8 (⅜ in): small clean stone for walkways and pipe bedding — walkable and drains.
- #57 (¾–1 in) — 1.35 t/yd³: the workhorse driveway top course and drainage stone. Clean, angular, stays put under tires. The calculator’s default.
- #3–#4 (1–2 in) — 1.3 t/yd³: big base stone for the bottom lift over soft ground and around culverts; more voids, so a touch lighter per yard.
- Rip-rap (3 in+): armor stone for erosion control — sized by the ton on the rip-rap calculator.
Full descriptions of every screen number are on the gravel size chart, and other crushed stone estimates the same way through the gravel calculator.
How deep should crushed limestone be?
Depth is the input that moves the tonnage most, and for limestone it’s also a thin-over-thick rule: the clean top course goes on shallow, the compacting base goes on deep, and the two never swap. What each job wants:
- Paths & decorative beds: 2–3 in of #57 or screenings over landscape fabric.
- Driveway top course: 2–3 in of #57 over a compacted base — never one deep loose lift, which just ruts.
- Driveway base: 4–6 in of #3–#4 or crusher run below the top course; the road base calculator sizes that lift.
- Paver setting bed: a 1 in screeded layer of screenings over the compacted base.
- Drainage: 4–12 in of clean #57 around pipe and in French drains, no fines.
How much does a ton of limestone cover?
Table 1 is coverage per ton of #57 by depth; Table 2 is the size guide with what each gradation does.
| Depth | 1 ton covers |
|---|---|
| 2″ | 120 ft² |
| 3″ | 80 ft² |
| 4″ | 60 ft² |
| 6″ | 40 ft² |
| Size | Best for |
|---|---|
| Screenings | Paths, under pavers |
| #8 — ⅜″ | Walks, pipe bedding |
| #57 — ¾–1″ | Driveway top, drainage |
| #3 — 1–2″ | Base lifts, culverts |
| Rip-rap — 3″+ | Erosion control |
How to measure for crushed limestone
- Measure length and width of the area; total odd shapes with the square footage calculator.
- Set the depth by the job from the depth guide — the compacted top course, not the loose pile.
- Pick the gradation so the density is right — #57, screenings or large #3.
- Set the allowance: 5% for a decorative or top course, 10% for a base lift you’ll compact.
- Enter the quarry price per ton — limestone is cheapest where it’s local, so get a delivered quote.
Worked example: limestone for a 20 × 10 pad
The default, worked line by line — 20 × 10 ft, 3 in of #57 at 1.35 t/yd³, 5% waste, $40 a ton:
volume = 200 × (3 ÷ 12) = 50 ft³ = 1.85 yd³
weight = 1.85 × 1.35 = 2.5 tons exact
waste = 2.5 × 1.05 = 2.625 → order 2.75 tons
cost = 2.75 × $40 = $110 · 1 ton covers 80 ft² at 3″
Screenings would weigh a hair more (1.4 t/yd³ → 2.59 tons exact), big #3 stone a hair less (1.3 → 2.41). The gradation moves the tonnage a few percent; the depth and the compacted-vs- loose call move it far more, which is why the top course goes on thin and over a base.
One more field note the math doesn’t show: limestone is cheapest where it’s quarried, so the same #57 that runs $30 a ton near an Indiana or Kentucky quarry can double by the time it’s trucked to a coast. Get a delivered quote and the calculator’s cost line tracks the number you’ll actually pay, haul included.
What this limestone estimate doesn’t include
The calculator prices the stone on the scale. A finished driveway or path spends on the layers and site work around it too — budget these before calling the total done:
- The base lift. #57 driveway stone rides on 4–6 in of compacted base — a separate order.
- Delivery. A flat per-load haul fee plus any short-load minimum.
- Geotextile fabric. Under stone on soft or clay ground to stop it pumping into the mud.
- Compaction. A plate compactor for base and setting beds.
- Edging. Restraint to keep loose #57 out of the lawn.
- Grading and spreading. Shaping the crown and raking the stone flat.
Limestone FAQ
How much crushed limestone do I need?
Length × width × depth ÷ 12 ÷ 27 gives cubic yards; multiply by 1.35 for tons of #57. The default 20 × 10 ft area at 3 in is 1.85 yd³ — exactly 2.5 tons, ordered as 2.75 with 5% waste, about $110 at $40 a ton.
How many tons of limestone are in a cubic yard?
About 1.35 tons for clean #57 crushed limestone, 1.4 for screenings that pack tighter, and closer to 1.3 for large #3–#4 stone with more voids. Pick the gradation in the material menu and the math follows.
How much does a ton of limestone cover?
80 ft² at 3 in deep in #57 — 120 ft² at 2 in, 60 at 4 in, 40 at 6 in. The live coverage line under the drawing recomputes for your depth.
What size limestone for a driveway?
A 2–3 in top course of #57 (¾–1 in stone) over 4–6 in of compacted base is the standard build. #57 is large enough to stay put under tires and small enough to walk on; save the big #3 for the mud-season base lift.
What are limestone screenings used for?
The fines from crushing — under pavers and flagstone, as a path topping, and to tighten loose stone. They compact almost like concrete, which is exactly why they’re the classic setting bed for dry-laid stone.
Is limestone good for a driveway?
Yes — it is one of the most common driveway stones where it is quarried locally, because it compacts tight, sheds water and stays put under tires. In limestone country it is also the cheapest good option. The catch is dust in dry spells and some rutting without a proper compacted base, both fixed by building it in lifts.
How much does crushed limestone cost?
Commonly $30–55 per ton in 2026 depending on size and haul distance — limestone country pays the low end. The default job runs about $110 bulk; bagged stone at ~$6 per half-cubic-foot bag costs several times bulk past a ton.
Sources and standards
- AASHTO M43: the #8, #57, #3 size designations for crushed limestone.
- ASTM C33: aggregate gradation and quality requirements.
- Standard estimating densities: 1.3–1.4 t/yd³ by gradation, matching the site-wide aggregate set.
- The quarry ticket: moisture and gradation move the weight — the scale governs the invoice.
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