Crushed Limestone Calculator
A crushed limestone calculator turns L × W × depth ÷ 27 into cubic yards, then tons at 1.35 t/yd³. A 20 × 10 ft base at 4 in needs 3.33 tons of limestone.
What your order looks like
One bulk delivery is usually easier than hauling it yourself.
2.47 yd³ · 3.3 tons
34 wheelbarrow trips (2 cu ft each)
5 pickup loads (0.75 ton each)
1 small dump truck load (6 tons each)
Rules of thumb: A wheelbarrow trip is 2 cubic feet of heavy material, about 200 lb, a load most people can push. A pickup load is 0.75 ton, the payload of a full-size half-ton pickup (1,500 lb). A small single-axle dump truck carries about 6 tons.
How much crushed limestone do I need?
This crushed limestone calculator multiplies length × width × depth to get cubic feet, divides by 27 for cubic yards, and multiplies by 1.35 tons per cubic yard to give the weight to order. The formula is tons = (length × width × depth in inches ÷ 12) ÷ 27 × 1.35. A 20 × 10 ft base at 4 inches needs 3.33 tons.
Enter the area in feet, the finished depth in inches, and your quarry’s price per ton. Tick the 10% box to cover compaction and spreading loss.
The formula, one step at a time
Quarries weigh limestone on a truck scale, but you measure the job with a tape. The calculator bridges the two:
- Depth to feet: 4 inches ÷ 12 = 0.333 ft
- Cubic feet: length × width × depth in feet
- Cubic yards: cubic feet ÷ 27
- Tons: cubic yards × 1.35
- With waste: tons × 1.10, then multiplied by your price per ton
The result is not rounded. Most quarries load to the nearest tenth or half ton, so round up when you place the order.
Worked examples
- Shed or parking base: 20 ft × 10 ft, 4 in deep, $45/ton
- Cubic feet: 20 × 10 × 0.333 = 66.7 ft³
- Cubic yards: 66.7 ÷ 27 = 2.47 yd³
- Tons: 2.47 × 1.35 = 3.33 tons, costing $150.00
- With 10% extra: 3.67 tons, costing $165.00
- Driveway lift: 100 ft × 12 ft, 6 in deep, $45/ton
- Cubic feet: 100 × 12 × 0.5 = 600 ft³
- Cubic yards: 600 ÷ 27 = 22.22 yd³
- Tons: 22.22 × 1.35 = 30.00 tons, costing $1,350.00
- With 10% extra: 33.00 tons, costing $1,485.00
At 33 tons, example 2 takes two or more dump-truck loads. Ask the quarry how much their trucks carry before you book.
Crushed limestone coverage
| Depth | Sq ft covered by 1 ton | Tons per 100 sq ft |
|---|---|---|
| 2 in | 120 | 0.83 |
| 3 in | 80 | 1.25 |
| 4 in | 60 | 1.67 |
| 6 in | 40 | 2.50 |
| 8 in | 30 | 3.33 |
Figures are net, before the 10% allowance, at 1.35 tons per cubic yard.
Common limestone products
| Product | What it is | Typical use |
|---|---|---|
| Limestone screenings / dust | Fine particles, 3/8 in and down | Paver bedding, path topping, filling voids |
| #57 limestone | Clean angular stone about 1/2 to 1 in | Drainage, top dressing, under sheds |
| Dense-grade / crusher run | About 3/4 in stone mixed with fines | Compacted base for drives, pads, and slabs |
| #411 limestone | #4 stone blended with screenings | Driveway surface that locks together |
| #2 or #3 limestone | Larger stone, roughly 1.5 to 3 in | Bottom layer of new driveways |
Product names and gradations vary by state and quarry, so describe the job when you order.
How to measure
- Use the compacted depth you want. Graded limestone with fines settles noticeably under a plate compactor. The 10% box covers ordinary settling. For thick lifts compacted hard, many crews add 15 to 20%.
- Split irregular areas. Break curved drives and turnarounds into rectangles and triangles, then add the tons.
- Measure the existing surface. On a refresh, check the depth of stone already there with a spade. Low, muddy spots may need a fabric and base layer, not just a top-up.
Common mistakes
- Using clean stone where you need a binder. #57 drains well but stays loose. For a firm driveway surface, use a graded product with fines.
- Laying limestone directly on mud. Without a coarse base or a landscape fabric separator, the stone gets pushed into the soil and disappears.
- Ordering by the cubic yard when the quarry sells by the ton. Confirm the unit on the quote before you compare prices.
For other stone types, see the crushed stone calculator and the crusher run calculator. For a layered driveway, use the gravel driveway calculator.
Frequently asked questions
How many tons of crushed limestone are in a cubic yard?
This calculator uses 1.35 tons (2,700 lb) per cubic yard, a typical figure for loose, dry crushed limestone. Graded limestone with fines, such as dense-grade base, packs heavier, and wet stone weighs more. If your quarry quotes a different number, use theirs.
How much area does a ton of crushed limestone cover?
At 1.35 tons per cubic yard, a ton is 20 cubic feet. That covers about 120 sq ft at 2 inches, 80 sq ft at 3 inches, 60 sq ft at 4 inches, and 40 sq ft at 6 inches, before waste.
What makes crushed limestone different from crushed granite?
Limestone is a sedimentary rock made mostly of calcium carbonate. It is usually gray to off-white and softer than granite, so it breaks into angular pieces with plenty of fines that bind well. Granite is harder and more resistant to wear, which matters on high-traffic surfaces.
Does crushed limestone affect the pH of nearby soil?
It can, a little. Rain dissolves small amounts of calcium carbonate, which is alkaline, and carries it into the soil along the edges. Keep limestone paths and bases away from beds of acid-loving plants such as blueberries, azaleas, and rhododendrons.
What depth of crushed limestone should I order for a driveway?
New gravel driveways are usually built in layers totaling about 8 to 12 inches on firm soil: a coarse base, then a graded limestone layer with fines, then a thinner top layer. Compact each lift of about 4 inches before adding the next. A refresh of an existing drive is often 2 to 3 inches.
Estimates only. Verify quantities with your supplier before purchasing.