Calculating the amount of gravel, crushed stone, or sand for your project involves two steps: determining the volume of material needed and then converting that volume to weight for ordering purposes. Gravel suppliers typically sell by the cubic yard or by the ton, so you need both figures to get an accurate quote and avoid expensive shortages or costly overages.
The volume formula is: Volume (cubic yards) = Length (ft) × Width (ft) × Depth (ft) ÷ 27. Since depth is often measured in inches, convert to feet first by dividing by 12. For example, a 20 ft × 10 ft area at 4 inches deep: 20 × 10 × (4/12) = 66.67 cubic feet ÷ 27 = 2.47 cubic yards.
To convert volume to weight, multiply the cubic yards by the material density: Weight (tons) = Cubic Yards × Density (tons per cubic yard). Standard gravel weighs approximately 1.4 tons per cubic yard, so 2.47 cubic yards × 1.4 = 3.46 tons. This calculator performs both calculations automatically — enter your dimensions, select your material type, and get instant volume and weight results.
Always add 10–15% extra material to account for compaction, spreading losses, uneven ground, and slight measurement errors. Gravel compacts 20–30% when tamped or driven over, so the installed depth will be less than the loose-fill depth unless you compensate with additional material.
Different aggregate materials have different densities, which directly affects how much weight you need to order for a given volume. Below is a comprehensive density reference table for common landscaping and construction aggregates:
| Material | Density (tons/yd³) | Density (lbs/yd³) | Density (lbs/ft³) |
|---|---|---|---|
| Pea Gravel (3/8") | 1.50 | 3,000 | 111 |
| Crushed Stone (#57) | 1.40 | 2,800 | 104 |
| Crusher Run (DGA) | 1.50 | 3,000 | 111 |
| Bank Run Gravel | 1.40 | 2,800 | 104 |
| River Rock (1–3") | 1.35 | 2,700 | 100 |
| Decomposed Granite | 1.50 | 3,000 | 111 |
| Sand (construction) | 1.35 | 2,700 | 100 |
| Sand (wet) | 1.60 | 3,200 | 119 |
| Lava Rock | 0.50 | 1,000 | 37 |
| Limestone (crushed) | 1.50 | 3,000 | 111 |
| Slate Chips | 1.40 | 2,800 | 104 |
| Marble Chips | 1.50 | 3,000 | 111 |
| Recycled Concrete | 1.30 | 2,600 | 96 |
| Topsoil (dry) | 1.10 | 2,200 | 81 |
| Mulch (wood chips) | 0.40 | 800 | 30 |
These densities are approximate averages. Actual density varies based on moisture content (wet gravel weighs 10–20% more than dry), particle size distribution, mineral composition, and compaction level. When ordering, suppliers use a standard loose density. If you are ordering by the ton, verify with your supplier what density they use for conversions.
The correct gravel depth depends on the intended use, expected traffic load, and whether the gravel serves as a base layer or a finished surface. Using too little gravel results in premature wear, exposed substrate, and poor drainage. Using too much wastes money without significant benefit.
| Application | Recommended Depth | Material Type |
|---|---|---|
| Driveway (new, full depth) | 8–12 inches total (layered) | Base: crusher run; Top: #57 or pea gravel |
| Driveway (maintenance/refresh) | 2–3 inches top layer | Same material as existing |
| Walkway / Garden Path | 2–3 inches | Pea gravel, decomposed granite |
| Patio Base (under pavers) | 4–6 inches | Crusher run (compacted) |
| Drainage (French drain) | 6–12 inches | #57 crushed stone |
| Landscaping / Decorative | 2–3 inches | River rock, lava rock, marble chips |
| Under Concrete Slab | 4–6 inches | Crusher run or #57 stone |
| Septic Drain Field | 12–24 inches | Washed #57 or #67 stone |
| Retaining Wall Backfill | 12+ inches behind wall | #57 crushed stone |
| Playground Surface | 9–12 inches | Pea gravel (ASTM F1292 compliant) |
| Parking Area | 6–10 inches | Base: crusher run; Top: #57 stone |
For driveways, the industry standard is a three-layer system: 6 inches of large crushed stone base (#3 or #4, 1.5–3 inch stones), 4 inches of crusher run middle layer (compacted), and 2–3 inches of finish gravel on top (pea gravel, #57 stone, or decorative stone). Each layer should be compacted with a plate compactor or roller before adding the next layer.
Choosing the right type of gravel is as important as calculating the right quantity. Different gravel types have different properties — some compact well for structural applications, while others are decorative and drain freely. Here is a detailed guide to the most common types:
While gravel itself is not heavily regulated, its use in construction applications is governed by building codes and engineering standards. Understanding these requirements ensures your project passes inspection and performs as intended:
How you order and receive gravel significantly impacts both cost and convenience. Here are practical tips for getting the best value:
| Order Size | Best Purchase Method | Approximate Cost |
|---|---|---|
| Under 0.5 tons | Bagged (50 lb bags from hardware store) | $4–$8 per bag (~$160–$320/ton) |
| 0.5 – 1 ton | Pickup truck load (self-haul) | $25–$60 per ton + no delivery fee |
| 1 – 5 tons | Small dump truck delivery | $25–$60 per ton + $50–$150 delivery |
| 5 – 15 tons | Standard dump truck (10–15 ton capacity) | $20–$50 per ton + $75–$200 delivery |
| 15+ tons | Triaxle dump truck or multiple loads | $18–$45 per ton + delivery per load |
Bulk gravel is dramatically cheaper than bagged — typically 70–80% less per ton. A single 50 lb bag covers about 0.5 cubic feet (2 sq ft at 3 inches deep), while one ton of bulk gravel covers approximately 80–100 sq ft at 3 inches deep. For any project larger than a small garden path, bulk delivery is the way to go.
When scheduling delivery, prepare the site first: clear the area where the gravel will be dumped, ensure the delivery truck has access (most require at least a 10-foot-wide path and can reach approximately 25–30 feet from the road with their dump bed), and lay down landscape fabric if using gravel over soil.
Verify the quantity upon delivery. A standard dump truck holds 10–15 tons (or 6–9 cubic yards). If you ordered a specific amount, the truck should have a weight ticket from the quarry scale showing the exact tonnage loaded. Count the loads if you ordered multiple truckloads.
Proper installation determines whether your gravel project looks professional and lasts for years or deteriorates within months. Follow these best practices for each application type:
For decorative applications, the most common mistake is applying gravel too thin. A 1-inch layer looks sparse and quickly shows the landscape fabric or soil below. Apply a minimum of 2 inches (3 inches preferred) for full coverage that looks good and stays in place.
For a 10×20 ft driveway at 4 inches deep: Volume = (10 × 20 × 0.333) ÷ 27 = 2.47 cubic yards. Add 10% extra for compaction and spreading losses = 2.7 cubic yards. That is approximately 3.8 tons of standard gravel at 1.4 tons per cubic yard. For a full-depth new driveway (12 inches), triple these amounts.
A standard 50 lb bag of gravel covers about 0.5 cubic feet. There are 27 cubic feet in a cubic yard, so you would need 54 bags to equal one cubic yard. At $4–$8 per bag, that is $216–$432 per cubic yard in bags versus $25–$60 per cubic yard in bulk. Buying in bulk is far more economical for any project larger than a small garden bed.
A functional gravel driveway needs a minimum total depth of 6–8 inches. For long-lasting results and heavy vehicle use, install 12 inches in three layers: 6 inches of large crushed stone base, 4 inches of compacted crusher run, and 2–3 inches of finish gravel. Maintenance top-dressing requires only 2–3 inches every 2–5 years.
One ton of standard gravel (1.4 tons/yd³) equals approximately 0.714 cubic yards or 19.3 cubic feet. At a 2-inch depth, one ton covers about 108 sq ft. At 3 inches: 72 sq ft. At 4 inches: 54 sq ft. Coverage varies by material density — lighter materials like lava rock cover significantly more area per ton.
Gravel is significantly cheaper upfront. A 20×50 ft gravel driveway costs $1,500–$4,000 installed, while the same size concrete driveway costs $6,000–$15,000. However, gravel requires periodic maintenance (regrading, adding material every 3–5 years), while concrete needs minimal maintenance for 25–30 years. Over a 30-year period, total costs are often similar.
For decorative and landscaping applications, yes — landscape fabric prevents weed growth and stops gravel from sinking into the soil. For structural applications (driveway base, under concrete slabs), fabric is not typically used because it can inhibit proper compaction and interlock between the aggregate and subgrade. Use geotextile fabric for applications requiring both separation and drainage.
Install rigid edging around all gravel areas. Steel landscape edging (4-inch) is the most durable and professional option. Alternatives include aluminum edging, pressure-treated timber borders, stone or brick borders, or paver restraints. For driveways, install edging along both sides and consider a containment grid system (cellular confinement) that locks the gravel in place.
You should not place gravel directly over living grass. The grass will die and decompose, causing the gravel to sink unevenly. Proper preparation includes removing all sod and organic material (or applying herbicide and waiting 2+ weeks), grading the soil for proper drainage, compacting the soil, installing landscape fabric, and then spreading gravel. This preparation is essential for a clean, long-lasting result.
Delivery fees range from $50–$200 depending on distance from the quarry (most suppliers charge per mile after the first 10–20 miles), the number of loads, and the delivery truck type. Some suppliers include delivery in the per-ton price for minimum orders (typically 5+ tons). Always ask for an all-inclusive quote that includes material, delivery, and any minimum order surcharges.
Crushed stone is mechanically broken rock with angular, irregular shapes that interlock well and compact tightly — ideal for structural bases and drainage. Gravel refers to naturally weathered, rounded stones found in riverbeds and glacial deposits. Gravel does not compact as well as crushed stone but is more comfortable underfoot and aesthetically pleasing for decorative applications. In practice, suppliers often use the terms interchangeably, so always specify the size number (#57, #67, etc.) and whether you need angular or rounded material.