Limestone Calculator
Tonnage, cubic yards, and coverage for crushed limestone aggregate in 9 grade options. Use it for driveways, drainage, subbase, walkways, and compacted base work. Presets fill in common depths for residential driveways, heavy duty parking, drainage, and paths. Custom density lets you enter a supplier value for specialty limestone products.
Results
Densities vary by grade and application. Numbered grades #2 through #57 use loose densities of about 100 lb/ft³ typical of bulk supplier delivery. Dense-graded base mixes #304, #411, and #610 use compacted in-place densities of 125 to 130 lb/ft³ per state DOT base course specifications. Limestone screenings density (125 lb/ft³) reflects typical compacted state for path and bedding applications. If you're ordering dense-graded products for loose delivery rather than compacted use, expect 15 to 20 percent less weight per cubic yard. Add 10 percent waste for spillage and minor extra; compaction allowance is already built into the dense-graded densities. Verify exact density and minimum delivery quantity with your supplier.
How to use this calculator
- 01Pick what you're building: residential driveway, heavy duty parking lot, subbase under slab, drainage, walkway, or custom. The depth field fills in with a recommended value.
- 02Pick a limestone grade: screenings for paths, #57 for driveway base, #8 for walkway top dressing, #4 or #2 for heavy drainage, #304 or #411 or #610 for compacted base course, or crushed limestone for generic ordering. Custom density lets you enter a value from your supplier.
- 03Pick a shape: rectangle for straight runs, circle for round areas, or custom area for irregular shapes.
- 04Enter your dimensions and adjust depth if needed. Add a waste percentage of 10 percent for typical jobs; use a higher value when the site has irregular edges or expected spillage.
- 05Read total tons, cubic yards, bag count, and coverage area at the top of the results panel. Add a price per ton for cost estimation.
Understanding the math
Limestone tonnage math starts with volume. Multiply length, width, and depth in feet to get cubic feet, then divide by 27 for cubic yards. Tonnage comes from cubic feet times density in pounds per cubic foot, divided by 2000. Most crushed limestone grades use 100 lb/ft³ as a typical loose bulk density. Dense-graded base mixes (#304, #411, #610) use higher compacted in-place densities of 125 to 130 lb/ft³ because those products include fines and are sold for base course work. Add a waste percentage at the end for spillage and minor extra material.
Volume (ft³) = length × width × depth Volume (yd³) = ft³ / 27 Tonnage = ft³ × density / 2000 Order quantity = tonnage × (1 + waste / 100)
For a 20 ft × 12 ft residential driveway at 4 in depth using #57 limestone (100 lb/ft³) with 10 percent waste: volume is 20 × 12 × 0.333 = 80 ft³ (2.96 yd³). Tonnage is 80 × 100 / 2000 = 4 tons base. With 10 percent waste added, order quantity is 4 × 1.1 = 4.4 tons. Round up to whole tons when calling your supplier.
Limestone grades and coverage
Coverage values per ton at common application depths. Metric values are stored separately so the table stays clean after unit switching.
| Material | Use Case | Recommended Depth | Coverage per Ton |
|---|---|---|---|
| Limestone screenings | Path bedding, paver setting | 3 in | 64 sq ft |
| #8 limestone | Walkway dressing | 2 in | 120 sq ft |
| #57 limestone | Driveway base, drainage | 4 in | 60 sq ft |
| #4 limestone | Heavy drainage, subbase | 6 in | 40 sq ft |
| #2 limestone | French drains, foundation drainage | 12 in | 20 sq ft |
| #304 limestone | Compacted base course | 6 in | 31 sq ft |
| #411 limestone | Crusher run base | 6 in | 31 sq ft |
| #610 limestone | Dense base with fines | 6 in | 32 sq ft |
| Crushed limestone (generic) | Driveway base | 4 in | 60 sq ft |
Frequently asked questions
How much limestone do I need?
Multiply length by width by depth in feet to get volume in cubic feet. Divide by 27 for cubic yards. For tonnage, multiply cubic feet by density (100 lb/ft³ for most crushed grades) and divide by 2000. Add 10 percent waste for spillage and minor extra. For a 20 by 12 ft residential driveway at 4 inches deep with #57 limestone, that works out to about 4.4 tons. The calculator above runs this math for all 9 grade options.
How to calculate limestone tonnage?
Volume times density. Volume is length times width times depth in cubic feet. Density depends on grade: 100 lb/ft³ for most crushed limestone (#8, #57, #4, #2, generic crushed), 125 lb/ft³ for screenings and #610 dense-graded base, and 130 lb/ft³ for #304 and #411 dense-graded base. Divide pounds by 2000 to get tons. Most jobs add 10 percent waste for spillage. The calculator above handles grade density and waste percentage in one step.
How much #57 limestone do I need for a driveway?
For a residential driveway, plan on 4 to 6 inches of #57 limestone over a prepared subgrade. At 4 inches deep with #57 limestone density of 100 lb/ft³, 1 ton covers about 60 square feet. A 20 by 12 ft driveway (240 sq ft) at 4 inches needs about 4 tons base, or 4.4 tons with 10 percent waste. For heavy duty driveways and parking areas, use 6 to 8 inches depth. The calculator above runs the math for your exact dimensions and depth.
How much limestone screening do I need?
Limestone screenings, sometimes called limestone dust or fines, are used as bedding under pavers or as a path topping at 2 to 3 inches deep. Screenings density is about 125 lb/ft³ because the fine particles pack tighter than open-graded stone. At 3 inches deep, 1 ton of screenings covers about 64 square feet. For a 100 sq ft paver bedding area at 2 inches, that works out to about 1 ton. Use the calculator above for your exact area and depth.
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