Crushed Limestone Calculator
Calculate tons of crushed limestone for a driveway or base layer using its 1.35 tons per cubic yard density, plus total cost.
How this calculator works
Crushed limestone is sold by weight but measured by volume, so this calculator converts your length, width, and depth into cubic yards, then multiplies by crushed limestone’s typical density of 1.35 tons per cubic yard to get the tons you need to order.
Formula: Cubic yards = (Length ft × Width ft × Depth ft) ÷ 27. Tons = Cubic yards × 1.35.
Worked example
A 20 ft × 10 ft driveway base at a 4-inch depth:
- Depth in feet: 4 ÷ 12 = 0.3333 ft
- Cubic yards: (20 × 10 × 0.3333) ÷ 27 ≈ 2.4694 yd³
- Tons: 2.4694 × 1.35 ≈ 3.33 tons
- At $45/ton, that’s $150.00 before waste.
Coverage reference
| Area | Tons needed (at 4 in) |
|---|---|
| 10 ft × 5 ft | 0.83 tons |
| 20 ft × 10 ft | 3.33 tons |
| 40 ft × 20 ft | 13.33 tons |
How to measure your area
Measure the length and width of the area to be covered in feet, and use the compacted target depth rather than the loose depth you’ll actually spread, since limestone fines settle noticeably once compacted. For a driveway base, check whether your local frost line or vehicle weight calls for a deeper section than the standard 4 inches.
Frequently asked questions
What makes crushed limestone different from crushed stone or gravel?
Crushed limestone is quarried specifically from limestone bedrock, giving it a lighter, whitish-gray to tan color compared to the darker granite-based blends sold as generic crushed stone. It's also softer than granite, so it crushes into angular pieces that lock together well while still being easy on equipment during processing.
Why is crushed limestone a popular driveway base material?
Its angular shape and fine dust content let it compact into a dense, stable layer, and at 1.35 tons per cubic yard it's on the lighter end of aggregate density, which keeps delivery costs down for larger driveways. Many quarries in limestone-rich regions price it below granite-based alternatives simply because it's the local, abundant stone.
Does crushed limestone affect the pH of nearby soil?
Yes, slightly. Limestone is calcium carbonate, and rainwater running through a limestone base can carry trace alkalinity into adjacent soil over years, which is why landscapers sometimes avoid using it directly against acid-loving plantings like azaleas or blueberries.
What depth of crushed limestone should I order for a driveway?
4 inches is a common base depth for a residential driveway base, while heavier-use pads or a deeper structural base can call for 6 inches or more. Always compact in lifts if you're going past 4 inches, since a single thick lift often leaves the bottom under-compacted.
Should I add extra for waste when ordering crushed limestone?
Yes — the 10% waste toggle is a reasonable buffer for compaction settling and spillage while spreading, both of which are common on base-layer jobs regardless of the stone type.
Estimates only. Verify quantities with your supplier before purchasing.