Limestone Calculator
Calculate how much limestone you need for driveways, garden paths, retaining walls, or agricultural lime applications. See also our Crushed Stone Calculator, Gravel Calculator, and Concrete Calculator.
Project Details
How to Use the Limestone Calculator
Enter the project area dimensions and select the application type. For construction uses (driveway base, garden path, retaining wall fill), enter the desired depth in inches. For agricultural lime, enter the spreading rate in pounds per 1,000 square feet based on your soil test recommendations. The calculator determines cubic yards for bulk ordering, tons for weight-based pricing, and number of 50-lb bags for retail purchases.
Formula
Construction Limestone:
Volume (cu ft) = Length × Width × (Depth / 12)
Cubic Yards = Volume / 27
Tons = Cubic Yards × 1.5
Agricultural Lime:
Total Lbs = (Area / 1000) × Rate (lbs/1000 sq ft)
Tons = Total Lbs / 2000
Example Calculation
Driveway Base: 30 ft × 12 ft × 4" deep
Volume = 30 × 12 × (4/12) = 120 cu ft
Cubic Yards = 120 / 27 = 4.44 yd³
Tons = 4.44 × 1.5 = 6.67 tons
Bags (50 lb) = (6.67 × 2000) / 50 = 267 bags
Ag Lime: 30 ft × 12 ft = 360 sq ft @ 50 lbs/1000 sq ft
Total = (360/1000) × 50 = 18 lbs = 0.009 tons
Reference Table — Limestone Types and Densities
| Limestone Type | Density (tons/yd³) | Size | Price ($/ton) | Application |
|---|---|---|---|---|
| Crushed Limestone (#57) | 1.50 | 3/4" - 1" | $30-$50 | Driveways, drainage |
| Limestone Screenings | 1.55 | Fine (dust) | $25-$40 | Base, paver bedding |
| Quarry Process (QP) | 1.50 | Mixed 0-3/4" | $25-$35 | Sub-base, compaction |
| Rip Rap Limestone | 1.45 | 6" - 24" | $35-$60 | Erosion control |
| Agricultural Lime | 1.35 | Powder/granular | $30-$50 | Soil pH adjustment |
| Dolomitic Lime | 1.40 | Powder/granular | $35-$55 | Soil + magnesium |
| Limestone Blocks | 2.3 (solid) | 6" - 12" blocks | $80-$150 | Retaining walls |
Frequently Asked Questions
How much limestone do I need for a driveway?
A typical residential driveway (12 ft × 30 ft) needs 4-6 inches of limestone base. At 4 inches deep, you'll need approximately 6.7 tons. At 6 inches, you'll need about 10 tons. Install in two compacted layers for best results: 3-4 inches of #57 stone topped with 2 inches of screenings.
What is the difference between limestone and gravel?
Limestone is a specific sedite rock (calcium carbonate) that is quarried and crushed. Gravel is a general term for any loose rock aggregate. Crushed limestone has angular edges that lock together when compacted, making it superior for driveways and base courses. It also has a clean, light gray appearance.
How much agricultural lime should I apply?
Application rates depend on your soil test results and target pH. General guidelines: to raise pH by 0.5 points, apply 25-50 lbs per 1,000 sq ft for sandy soil or 75-100 lbs for clay soil. Most lawns need 40-50 lbs per 1,000 sq ft annually. Always base rates on a soil test for best results.
What is #57 limestone?
#57 stone is a crushed limestone aggregate sized 3/4 inch to 1 inch. It's the most common size for driveways, drainage, and base material. The number refers to the ASTM gradation specification. Other common sizes include #1 (2-4 inch), #3 (1-2 inch), #8 (3/8 inch), and #10 (screenings/dust).
Is limestone good for drainage?
Yes, clean crushed limestone (#57 or larger) is excellent for drainage applications. The angular shape creates consistent void spaces that allow water to flow freely. Use #57 stone around French drains, behind retaining walls, and under downspout extensions. Avoid limestone screenings for drainage as the fine particles restrict water flow.
How long does a limestone driveway last?
A properly installed limestone driveway lasts 15-25 years with minimal maintenance. You may need to add a thin top layer (1 inch of screenings) every 3-5 years to maintain the surface. Proper drainage, adequate depth, and good compaction during installation are the keys to longevity.