Limestone Calculator
Estimate crushed limestone for a driveway, pad, or path. Enter length and width in feet and depth in inches, pick the material type, and get tons, cubic yards, and 50 lb bags — with an extra-for-compaction percentage.
Example: with Length (ft) 20 · Width (ft) 10 · Depth (in) 3 · Material Crushed 3/4 in (#57) — 100 lb/cu ft · Extra for compaction (%) 10 → Limestone needed: 2.75 tons (5,500 lb).
- Cubic yards2.04 cu yd (with 10% extra)
- Volume before allowance50 cu ft
- 50 lb bags110 bags (50 lb)
Computed by the calculator below using its default values. Change any input to see your own numbers.
Volume = area × depth; weight uses typical bulk densities (crushed #57 ≈ 100 lb/cu ft ≈ 1.35 tons/cu yd). Crushed limestone compacts about 10% when rolled, so order extra.
From footprint to tonnage
Quarries sell crushed limestone by the ton, so the estimate runs volume-first: length × width × depth gives cubic feet, and the material's bulk density converts that to weight. Bulk density is the loose, as-delivered figure — around 100 lb per cubic foot for common 3/4 in (#57) limestone, more for fine screenings that pack tighter, less for big #2 stone with lots of air between pieces.
The compaction allowance matters: once you run a plate compactor or roller over it, crushed limestone loses roughly 10% of its placed depth. Ordering the extra up front beats a second delivery fee for half a ton.
Picking the right product and depth
For driveways, the classic build is 4 in of large stone (#2) as a base with 2-3 in of #57 on top, and many finish with screenings or crusher-run that locks tight. Paths and pads do fine with 2-3 in of #57 over fabric. Depths below 2 in of coarse stone do not spread loads and quickly go thin in wheel tracks — if budget forces a thin lift, choose smaller stone.
How it’s calculated
Volume = length × width × (depth ÷ 12) cu ft, × (1 + extra%/100) for compaction. Weight = volume × bulk density: #57 crushed 100 lb/cu ft (2,700 lb/cu yd), screenings 115, large #2 95, solid limestone 163 lb/cu ft. Tons = lb ÷ 2,000; cubic yards = cu ft ÷ 27; bags = lb ÷ 50, rounded up.
Bulk densities are typical values — moisture, gradation, and quarry source shift real weights by 10% or so, so confirm the per-yard weight with your supplier.
Limestone weights by product
| Product | lb/cu ft | Per cubic yard |
|---|---|---|
| Crushed 3/4 in (#57) | 100 | 2,700 lb (1.35 t) |
| Screenings / dust | 115 | 3,105 lb (1.55 t) |
| Large 2-4 in (#2) | 95 | 2,565 lb (1.28 t) |
| Solid limestone block | 163 | 4,401 lb (2.20 t) |
Typical bulk densities for limestone aggregate; solid rock at 2.61 g/cm³. Confirm exact figures with your quarry.
Common mistakes
- Ordering placed volume with no compaction allowance — the rolled surface ends up 10% low and the drive develops soft spots.
- Entering depth in feet: the tool wants inches. A 3 ft entry instead of 3 in orders twelve times the stone.
- Using solid-rock density (163 lb/cu ft) for crushed stone; voids between pieces make crushed material about 40% lighter per volume.
- Skipping the base layer on new driveways — 3 in of #57 straight on dirt migrates into the soil within a season or two.
Frequently asked questions
How do I calculate tons of limestone?
Tons = length (ft) × width (ft) × depth (in) ÷ 12 × density ÷ 2,000. With common #57 crushed limestone at about 100 lb per cubic foot, a 20 x 10 ft pad at 3 in is 50 cu ft ≈ 2.5 tons before the compaction allowance.
How much does a yard of crushed limestone weigh?
About 2,700 lb — 1.35 tons — for 3/4 in (#57) material. Fine screenings run closer to 1.5 tons per yard, and big #2 stone slightly less than #57.
How deep should limestone be on a driveway?
A new gravel driveway wants a 4 in compacted base of large stone topped with 2-3 in of #57 or crusher-run. Resurfacing an existing solid drive usually needs just 2 in of fresh top stone.
Tons or cubic yards — which should I order in?
Quarries price by the ton but trucks are sized in yards, so this tool gives both. The bridge number is the density: at 1.35 tons per yard, a 10-yard dump load of #57 is about 13.5 tons.
Why order extra for compaction?
Crushed limestone consolidates about 10% under a compactor as angular pieces interlock. If you need a true 3 in finished lift, you must place closer to 3.3 in of loose material.