Limestone Calculator - Tons, Cubic Yards, Cost
Enter your project area, depth, and limestone type to get the volume in cubic yards, weight in tons, number of bags, and an optional cost estimate. Supports crushed limestone, #57, #304 base mix, screenings, and more. Metric and imperial units both supported.
How to calculate limestone quantity
Calculating limestone quantity comes down to three steps: find the area, multiply by the depth to get a volume, then convert to weight. First, measure your length and width in feet and multiply them to get square footage. Second, multiply the area by the depth in inches and divide by 12 to convert to cubic feet, then divide by 27 to get cubic yards. Third, multiply cubic yards by the density of your chosen limestone grade (typically 1.40 to 1.68 tons per cubic yard) to get the weight in tons. Always add a 10-15% buffer for waste, spills, and settling before ordering. The shortcut formula for cubic yards is: (area in sq ft x depth in inches) / 324.
Choosing the right limestone grade
The right grade depends on your application. For a driveway base, #411/#304 base mix or plain crushed limestone compacts tightly and sheds water well. For the surface layer, #57 (3/4-inch) limestone is the most popular choice: angular pieces lock together under traffic yet allow drainage. For walkways and patios, #8 (3/8-inch) limestone or screenings create a finer, more compact surface. For erosion control along slopes and culverts, #2 rip-rap provides the mass needed to resist washout. Agricultural lime is a different product entirely: a finely ground calcium carbonate powder or pellet applied at rates determined by a soil pH test, not a thickness calculation.
Recommended depths by application
Depth has a big effect on performance and longevity. Residential driveways need 4-6 inches of compacted material (order 20-25% more before compaction since limestone settles). Patios and walkway bases need 3-4 inches. Road bases and commercial parking areas call for 6-8 inches for standard vehicles and 10-15 inches under heavy equipment. Drainage layers in French drains are typically 6-12 inches deep. If you are installing over soft or clay soil, excavate an extra 2-3 inches to allow for a fabric separator between soil and stone.
What limestone costs and how to save
US average limestone prices in 2026 range from about $30 to $75 per ton depending on grade and region. Screenings and base mixes are usually at the lower end; decorative or specialty grades cost more. Delivery fees add $50-$200 and most suppliers have a minimum order of 5-10 tons for delivery. Buying in bulk (10+ tons) often unlocks lower per-ton pricing. Comparing at least two local suppliers is worth the time: prices for the same grade can differ by 20-30% within a 50-mile radius. Picking up material yourself at the quarry cuts delivery cost but requires a truck or trailer rated for the load.
Limestone grades - density, size, and recommended use
| Grade | Size | Density (tons/yd³) | Typical application |
|---|---|---|---|
| Crushed limestone | Various angular pieces | 1.40-1.60 | Driveways, base layers, general fill |
| Screenings / fines | 1/8 inch and below | 1.60-1.75 | Paving base, pathways, leveling |
| #57 limestone | 3/4 inch nominal | 1.40-1.50 | Standard driveways, drainage beds |
| #8 limestone | 3/8 inch nominal | 1.38-1.45 | Walkways, playground surfaces, borders |
| #411 / #304 base mix | Mixed fines + 3/4 in | 1.50-1.60 | Premium driveway base, parking areas |
| #2 rip-rap | 2-4 inch pieces | 1.35-1.45 | Erosion control, drainage culverts |
| Agricultural lime | Fine powder/pellets | 0.80-0.90 | Soil pH amendment, pasture/field |
Densities are typical values in tons per cubic yard. Always confirm with your supplier, as values vary by quarry and moisture content.
Frequently asked questions
How much does a ton of limestone cover?
Coverage depends on depth. One ton of crushed limestone (density ~1.5 tons/yd³) equals about 0.67 cubic yards or 18 cubic feet. At 2 inches deep, that covers roughly 108 sq ft; at 3 inches, about 72 sq ft; at 4 inches, about 54 sq ft. Use our calculator for your exact depth and limestone type.
How many tons of limestone do I need for a driveway?
For a standard residential driveway (e.g. 12 ft wide by 50 ft long, about 600 sq ft) at 4 inches deep, you need roughly 4.4 cubic yards and about 6.7 tons of crushed limestone, including a 10% waste buffer. Wider or longer driveways scale proportionally - enter your exact dimensions above.
What is the difference between #57 and #304 limestone?
#57 limestone is a uniformly sized 3/4-inch stone with few fines. It drains very well but does not compact into a hard surface on its own. #304 (also called #411) is a blend of 3/4-inch stone and fines that compacts tightly, making it the standard choice for driveway bases. Many contractors install a 3-4 inch layer of #304 as a base and top it with 2 inches of #57 for the surface.
How do I convert cubic yards to tons of limestone?
Multiply cubic yards by the density of your limestone grade in tons per cubic yard. Crushed limestone is typically 1.40-1.60 tons/yd³, so 1 cubic yard weighs about 1.4 to 1.6 tons. Screenings are denser: 1.60-1.75 tons/yd³. If your supplier gives you a specific density, use that instead.
Do I need to compact limestone?
Yes, for structural uses like driveways, parking areas, and building bases. Compaction typically reduces the loose volume by 15-25%, so you need to order and place more material than the finished depth would suggest. Use a plate compactor in 2-3 inch lifts (layers), dampening lightly if very dry. Limestone screenings compact the most; larger rip-rap and #57 stone compact very little.
How many bags of limestone do I need?
Divide the total weight in pounds by the bag size. For example, 2 tons (4,000 lbs) at 50 lbs per bag requires 80 bags. Bags are practical for small projects (a garden path, a patio under 50 sq ft) but become very expensive per ton compared with bulk delivery for anything larger.
What is the density of limestone in tons per cubic yard?
It depends on the grade and how tightly it is packed. General crushed limestone averages 1.5 tons/yd³. Screenings are denser at 1.6-1.75 tons/yd³ because the fines fill the gaps. Loose, large rip-rap runs lower, around 1.35-1.45 tons/yd³. Agricultural lime is much lighter at roughly 0.85 tons/yd³ because it is finely ground powder.