Gravel Calculator
PrintGravel is one of the most widely used raw materials in residential landscaping, driveway construction, and civil engineering. Whether you are surfacing a rural driveway, installing a French drain system, or building a patio base, calculating the exact volume and weight of gravel is essential. Because gravel is sold both by volume (cubic yards) and by weight (tons), accurate density conversions prevent costly delivery errors.
Our free online Gravel Calculator estimates project materials in three quick steps:
- Area Footprint: Input your project coverage area in square feet, square meters, square yards, or acres.
- Gravel Depth: Specify your target depth in inches or centimeters (e.g., 2 to 3 inches for walkways, 4 to 6 inches for driveways).
- Density & Tonnage Weight: Select material density (loose gravel, gravel with sand, wet/dry sand) to compute weight in short tons, metric tons, or pounds, alongside total material cost.
Recommended Gravel Depths & Density Conversions
The required depth of gravel depends directly on the load and drainage needs of your application:
- Walkways & Garden Borders (2 to 3 Inches): Provides comfortable foot traction while preventing weeds and soil erosion.
- Driveways & Parking Pads (4 to 6 Inches): Supports vehicle weight without sinking. Typically installed over a compacted sub-base of crushed stone.
- French Drains & Retaining Wall Backfill (8 to 12 Inches): Ensures rapid water runoff around drainage pipes to prevent soil pressure build-up.
Because gravel contains air pockets between stones, its weight varies by compaction and particle size. Standard dry loose gravel has an average bulk density of approximately 2,700 lbs per cubic yard (1.35 short tons per cubic yard), whereas dense gravel mixed with sand weighs up to 3,400 lbs per cubic yard (1.7 short tons per cubic yard).
Gravel Bulk Density & Tonnage Conversion Table
The table below provides density benchmarks to help convert volume (cubic yards) into weight (tons) for common aggregate mixes:
| Aggregate Type | Average Particle Size | Density (lbs / cu yd) | Weight per Cu Yd (Short Tons) |
|---|---|---|---|
| Standard Loose Gravel | 0.2″ to 2.0″ (0.5 to 5 cm) | 2,700 lbs | 1.35 tons |
| Gravel with Sand (Bank Run) | Mixed fines and rocks | 3,240 lbs | 1.62 tons |
| Dry Sand | Fine particles (< 2 mm) | 2,700 lbs to 2,900 lbs | 1.35 to 1.45 tons |
| Wet Sand / Compacted Mix | Saturated fines | 3,500 lbs | 1.75 tons |
Geological & Engineering Size Scales
Geologists and civil engineers classify rock fragments based on grain size diameter. Two major global standards govern these definitions:
| Classification Scale | Category Name | Particle Diameter (Metric) | Particle Diameter (Imperial) |
|---|---|---|---|
| Udden-Wentworth (US Geology) | Granular Gravel | 2 to 4 mm | 0.079 to 0.157 in |
| Pebble Gravel | 4 to 64 mm | 0.2 to 2.5 in | |
| ISO 14688-1:2002 (International) | Fine Gravel | 2.0 to 6.3 mm | 0.079 to 0.248 in |
| Medium Gravel | 6.3 to 20 mm | 0.248 to 0.787 in | |
| Coarse Gravel | 20 to 63 mm | 0.787 to 2.480 in |
Common Commercial & Landscaping Gravel Types
Choosing the correct aggregate type ensures structural stability and proper drainage:
- Pea Gravel: Small, rounded stones (1/4 to 1/2 inch) formed by natural erosion. Available in varied natural colors. Comfortable to walk on, making it ideal for garden paths, dog runs, and patio borders.
- Crushed Stone (Limestone/Granite): Mechanically crushed rock with sharp, angular edges. Unlike smooth river stones, crushed stone interlocks under heavy pressure, forming a rigid base ideal for driveways and road sub-layers.
- River Stone / River Rock: Large naturally rounded stones (1 to 3 inches). Used primarily for decorative garden beds, dry creek beds, and pond borders due to its vibrant smooth appearance.
- Bank Gravel (River Run): A natural unwashed mixture of river rocks, sand, and clay. Highly cohesive when compacted; ideal for fill material, backfilling trenches, or creating road base sub-layers.
To calculate the three-dimensional volume of trench excavations, check out our Volume Calculator. To determine surface area before ordering gravel, use our Square Footage Calculator or Area Calculator.
Frequently Asked Questions (FAQ)
How many tons of gravel are in a cubic yard?
On average, one cubic yard of dry gravel weighs approximately 1.35 to 1.4 short tons (2,700 to 2,800 lbs). If the gravel contains sand or moisture, the weight increases to 1.5 to 1.7 tons per cubic yard.
How do I convert square feet of gravel to tons?
To convert square feet to tons:
1. Multiply square footage by depth in feet (e.g., 3 inches = 0.25 feet) to find cubic feet.
2. Divide cubic feet by 27 to find cubic yards.
3. Multiply cubic yards by 1.4 (average tons per cu yd).
Formula: (Sq Ft × Depth in Feet ÷ 27) × 1.4 = Tons of Gravel
Is crushed stone better than pea gravel for driveways?
Yes. Crushed stone is significantly better for driveways because its angular edges interlock under vehicle weight, creating a stable surface that stays in place. Smooth pea gravel shifts under car tires, creating deep ruts over time.
What is agricultural lime gravel used for?
Agricultural lime is pulverized limestone or chalk used as a soil additive to raise soil pH (reduce acidity) for crops. Coarse ground gravel is also fed to poultry (chickens and turkeys) as gizzard grit to help them mechanically digest food in their digestive tracts.