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Gravel & aggregate weight

Gravel Calculator: Estimate Tons & Cubic Yards for Driveways & Landscaping

Free gravel calculator with material density presets, compaction buffer, and cost estimation. Supports rectangular, circular, and triangular areas.

Project dimensions

Recommended to maintain desired depth over time

Results
1.04

Cubic yards

Cubic feet25.00
Cubic meters0.79

Weight

Tons1.40
Tonnes (metric)1.27
Pounds2,800

Gravel Calculator: Material Volume and Weight Estimator

Calculate the exact amount of gravel, crushed stone, or sand needed for your project. Avoid ordering too little or paying for excess waste with automatic volume conversions, weight calculations, and compaction buffers.

Material Planning Insights

The Compaction Factor

Gravel naturally settles when compacted by vehicles or rain.
Adding a 10-15% buffer accounts for this settling, ensuring your project maintains proper depth over time and prevents base layer exposure that can lead to structural issues.

Density Matters

Material density directly impacts project costs and logistics.
Heavier materials like river rock require more transport capacity and cost more per ton, while lighter options like pea gravel are easier to spread but may need more volume for the same coverage.

Depth Standards

Application determines optimal depth.
Walkways require less material (2-3 inches) for foot traffic, while driveways need 4-6 inches to support vehicle weight. Too little depth leads to base exposure; too much wastes material and money.

Shape Flexibility

Calculate rectangular, circular, or triangular areas accurately.
Each shape requires different formulas, but our calculator handles all conversions automatically.

Gravel Calculator: Estimate Tons & Cubic Yards for Driveways & Landscaping

Free gravel calculator for driveways, walkways, and landscaping. Calculate cubic yards, tons, and weight for pea gravel, crushed stone, river rock, and sand. Includes compaction buffer and cost estimation.

What This Calculator Does

This gravel calculator estimates the volume and weight of gravel, crushed stone, river rock, or sand needed for driveways, walkways, drainage beds, and other landscaping or construction projects. Enter the shape of your area (rectangular, circular, or triangular), its dimensions, and the desired depth; the calculator returns volume in cubic yards, weight in tons based on the selected material's density, and an optional cost estimate. A compaction buffer, defaulting to 12%, adds extra material to account for settling under traffic, rain, and time. The tool covers pea gravel, crushed stone, river rock, and sand at standard density ranges, or you can enter a custom density from your supplier. It does not estimate labor, delivery fees, or base-layer preparation costs.

How the Math Works

Volume is calculated from the area shape and desired depth. For a rectangle: V=Lร—Wร—DV = L \times W \times DFor a circle: V=ฯ€r2ร—DV = \pi r^2 \times DFor a triangle: V=12โ€‰bโ€‰hร—DV = \tfrac{1}{2} \, b \, h \times DAll dimensions are converted to feet first, then the cubic-foot result is divided by 27 to get cubic yards (1 ydยณ = 27 ftยณ). Weight follows from density: Weight (tons) = Volume (ydยณ) ร— Density (lbs/ydยณ) รท 2,000. Worked example: a 20 ร— 10 ft driveway at 4 inches deep โ†’ 20 ร— 10 ร— 0.333 = 66.7 ftยณ รท 27 โ‰ˆ 2.47 ydยณ. With crushed stone at 2,700 lbs/ydยณ, that is 2.47 ร— 2,700 รท 2,000 โ‰ˆ 3.33 tons. Adding a 12% compaction buffer gives 3.33 ร— 1.12 โ‰ˆ 3.73 tons to order. Edge case: for circular areas, enter the diameter, the calculator halves it to radius internally.

How to Use This Calculator

Select the shape of your project area, rectangular, circular, or triangular, from the shape picker. Enter the relevant dimensions: length and width for rectangles, diameter for circles, or base and height for triangles, along with the desired gravel depth in inches or centimeters. Choose a material type (pea gravel, crushed stone, river rock, or sand) or enter a custom density in pounds per cubic yard if your supplier provides one. Enable the compaction buffer toggle and set a percentage (default 12%) to account for settling over time. Optionally enter a price per ton for an instant cost estimate. The results display total volume in cubic yards, weight in tons, and estimated project cost. Adjust material type or density to compare quotes from different suppliers.

Gravel Coverage Guide

Understanding Gravel Volume and Weight

Gravel estimation: volume (L ร— W ร— D), convert to cubic yards, then weight using material density. The calculator does all three and applies your compaction buffer.
  • Volume Calculation:
    Rectangular: V=Lร—Wร—DV = L \times W \times D. Circular: V=ฯ€r2ร—DV = \pi r^2 \times D. Triangular: V=12bhร—DV = \frac{1}{2} b h \times D (base ร— height / 2 ร— depth).
  • Unit Conversion:
    Convert cubic feet to cubic yards by dividing by 27. One cubic yard equals 27 cubic feet.
  • Weight Conversion:
    Multiply cubic yards by the material density (lbs per cubic yard) to get total weight in pounds, then convert to tons by dividing by 2,000.

Standard Material Densities

Different gravel types have different densities, affecting both weight and coverage calculations.
  • Pea Gravel:
    2,400-2,800 lbs per cubic yard (1.2-1.4 tons). Best for patios, walkways, and decorative landscaping. Lighter weight makes it easier to spread.
  • Crushed Stone:
    2,500-2,900 lbs per cubic yard (1.25-1.45 tons). Ideal for driveway bases and areas requiring good compaction. Angular edges interlock for stability.
  • River Rock:
    2,600-3,200 lbs per cubic yard (1.3-1.6 tons). Heaviest option, excellent for drainage and erosion control. Smooth, rounded stones.
  • Sand/Finings:
    2,600-3,000 lbs per cubic yard (1.3-1.5 tons). Used for bedding layers, leveling, and as a base for pavers. Fine texture compacts well.

Recommended Depths by Application

Proper depth ensures stability and prevents base layer exposure. Too little depth leads to failure; too much wastes material.
  • Walkways:
    2-3 inches of gravel provides adequate coverage for foot traffic. Use pea gravel or crushed stone for best results.
  • Driveways:
    4-6 inches minimum (3 inches absolute minimum for stability). Residential driveways typically use 4-6 inches, while commercial or heavy vehicle areas may need 6-8 inches.
  • Drainage Areas:
    3-4 inches of river rock provides effective drainage while maintaining stability. Deeper layers may be needed for heavy water flow.
  • Base Layers:
    4-6 inches of crushed stone or sand provides a stable foundation for pavers, concrete, or asphalt surfaces.

Understanding Compaction and Settling

Why Gravel Settles

Gravel compacts when driven on, walked on, or exposed to rain. This settling reduces the depth of your gravel layer over time, potentially exposing the base layer underneath.
  • Vehicle Traffic:
    Cars and trucks compress gravel, causing 5-10% immediate settling. Over time, this can increase to 10-15% total compaction.
  • Rain and Water:
    Water washes fine particles into gaps, causing additional settling. Proper drainage helps but doesn't eliminate compaction.
  • Foot Traffic:
    Even pedestrian traffic causes gradual compaction, especially in high-traffic walkways.
  • What this calculator does:
    Optional 12% compaction buffer adds extra material so you stay at target depth after settling.

Pro contractors typically add 10-15% to gravel orders. The default 12% buffer in this calculator is a safe middle ground.

Cost Estimation and Ordering Tips

Calculating Project Costs

Enter your supplier's price per ton to see total project cost. Handy for comparing quotes.
  • Price Per Ton:
    Gravel prices vary by location, material type, and quantity. Typical prices range from $15-50 per ton, with bulk orders often receiving discounts.
  • Delivery Considerations:
    Factor in delivery costs, especially for large orders. Some suppliers offer free delivery for orders over a certain tonnage.
  • Bulk Discounts:
    Ordering larger quantities often reduces the per-ton price. Calculate whether buying extra material for future projects is cost-effective.

Ordering Best Practices

Order in increments that match supplier capabilities and minimize waste.
  • Round Up:
    Always round up to the nearest 0.25 or 0.5 cubic yards. Suppliers typically deliver in these increments, and having a small buffer prevents short-orders.
  • Consider Future Needs:
    If you have multiple projects planned, ordering in bulk can save money. Store excess material properly to prevent contamination.
  • Verify Density:
    If using custom density, verify the actual weight per cubic yard with your supplier. Density can vary by source and moisture content.

FAQ

How many tons of gravel are in a cubic yard?

Weight per cubic yard varies by material. Pea gravel: 1.2-1.4 tons (2,400-2,800 lbs). Crushed stone: 1.25-1.45 tons (2,500-2,900 lbs). River rock: 1.3-1.6 tons (2,600-3,200 lbs). Sand: 1.3-1.5 tons (2,600-3,000 lbs). The calculator uses these densities when converting volume to weight.

What is the best gravel for a sloped driveway?

Crushed stone is the best choice for sloped driveways because it compacts well and provides excellent traction. The angular edges of crushed stone interlock when compacted, creating a stable surface that resists washout during heavy rain. For steeper slopes, use larger aggregate sizes (1-2 inches) and ensure proper drainage. Always apply a 10-15% compaction buffer to account for settling over time.

How much gravel do I need for a driveway?

Residential driveways typically need 4-6 inches of gravel (3" minimum for stability); heavy traffic or commercial use calls for 6-8 inches. Volume = length ร— width ร— depth, then add 10-15% for compaction. The calculator converts to cubic yards and tons, with an optional compaction buffer.

What is a compaction buffer and why do I need it?

A compaction buffer (10-15%) covers the settling that happens when gravel is driven on or rained on. Skip it and the layer thins over time, you risk exposing the base. Adding 12% keeps you at target depth. The calculator has an optional buffer (default 12%).

DIY Estimation Note

Estimates Only: These calculators provide theoretical estimates based on standard dimensions. Material density, waste factors, and specific project conditions vary significantly.

Verify Locally: Always verify measurements and material requirements with a professional contractor or local building codes before purchasing supplies or starting work.

Project Accuracy: CalcRegistry is not responsible for material shortages, overages, or structural issues resulting from the use of these general estimates.

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