Gravel Calculator - Tons, Cubic Yards & Driveway Base
Calculate required gravel volume in cubic yards and total weight in tons for driveways, French drains, patios, and walkways with compaction buffers.
Gravel Calculator
Calculate required gravel volume in cubic yards and total weight in tons for driveways, French drains,...
How to Calculate Gravel
Gravel is often used for driveways, paths, and drainage. It is usually sold by weight (tons) or volume (cubic yards).
Steps to calculate:
- Calculate the area of your project (Length × Width).
- Determine the required depth (usually 2-4 inches for driveways).
- Calculate the volume in Cubic Yards.
- Multiply the volume by the material's density to get the **Total Tons**.
Standard gravel has a density of roughly **1.35 tons per cubic yard**. This means one cubic yard of gravel weighs about 2,700 pounds.
About Gravel Calculator
What is a Gravel Calculator & How Does It Work?
A Gravel Calculator determines the volume in cubic yards and total weight in tons of gravel, crushed stone, pea stone, or aggregate base required for your construction or landscaping project. Because quarries and landscape supply yards sell aggregates by the ton across certified weight scales, converting your area dimensions into accurate tonnage prevents multiple costly delivery truck trips.
The Mathematics of Gravel Volume and Tonnage
$$\text{Cubic Yards} = \frac{\text{Length (ft)} \times \text{Width (ft)} \times \text{Depth (inches)}}{324}$$
$$\text{Weight (Tons)} = \text{Cubic Yards} \times \text{Bulk Density Factor}$$
Standard Material Bulk Density Factors:
- Crushed Stone (#57 Clean Granite): $\approx 1.40\text{ tons per cubic yard}$ ($2,800\text{ lbs/yd}^3$)
- Dense Graded Aggregate (Crusher Run / Road Base): $\approx 1.50\text{ tons per cubic yard}$ ($3,000\text{ lbs/yd}^3$)
- Rounded Pea Gravel: $\approx 1.35\text{ tons per cubic yard}$ ($2,700\text{ lbs/yd}^3$)
- Decomposed Granite: $\approx 1.45\text{ tons per cubic yard}$
$$\text{Total Tonnage (with 15\% Compaction)} = \text{Weight (Tons)} \times 1.15$$
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Real-World Worked Examples
Example 1: Resurfacing a Country Gravel Driveway
- Dimensions: 100 feet long × 12 feet wide
- Depth: 3 inches of #57 crushed limestone
- Step 1: Calculate Volume:
$$\text{Cubic Yards} = \frac{100 \times 12 \times 3}{324} = \frac{3600}{324} = \mathbf{11.11\text{ cubic yards}}$$
- Step 2: Convert to Tonnage (1.4 tons/yd³):
$$11.11 \times 1.4 = \mathbf{15.55\text{ tons}}$$
- Step 3: Add 15% Compaction & Settling:
$$15.55 \times 1.15 = \mathbf{17.88\text{ tons}}$$
- Order Recommendation: Order 18 tons (one full tri-axle dump truck load).
Example 2: Pea Gravel Garden Pathway
- Dimensions: 30 feet long × 4 feet wide | Depth: 2 inches
- Volume: $(30 \times 4 \times 2) / 324 = \mathbf{0.74\text{ cubic yards}}$
- Tonnage (1.35 tons/yd³): $0.74 \times 1.35 = \mathbf{1.0\text{ ton (2,000 lbs)}}$.
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Step-by-Step Guide: How to Calculate Gravel
- Measure Project Area: Determine length and width in feet.
- Select Material Type: Choose clean crushed stone, road base, or pea gravel.
- Choose Appropriate Depth: 2-3 inches for walkways; 4-6 inches for driveways.
- Include Compaction Allowance: Add 10-15% for vehicular traffic.
- Pair with Excavation Tools: Use our Cubic Yards Calculator and Mulch Calculator.
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Practical Applications for Homeowners & Contractors
- Driveway Construction & Pothole Repair: Grade durable roadways that shed storm water without rutting.
- French Drains & Foundation Drainage: Size washed stone surrounding perforated PVC drainage pipes.
- Paver Patio Base Preparation: Lay sub-base aggregates under permeable paving stones.
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Important Practical Caveats
- Subgrade Settlement: Gravel laid over soft, uncompacted clay soil will sink into the mud under heavy vehicle wheel loads unless separated by geotextile fabric.
- Crown Your Driveway: Ensure the center of a gravel driveway is 2 inches higher than the edges to facilitate rapid rainwater runoff into side ditches.
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Aggregate Grading, Compaction Ratios & Subbase Construction
Estimating gravel tonnage for driveways, drainage trenches, and paver subbases requires factoring aggregate size and compaction:
- Understanding Aggregate Sizes & Types:
- #57 Crushed Stone (1/2 to 1 inch): Angular limestone or granite with clean voids, ideal for French drains and permeable driveway tops.
- Crusher Run / Dense Grade (Stone Dust to 3/4 inch): Mix of fine stone dust and crushed rock that locks together tightly under compaction, serving as the essential foundation for driveways and structural patios.
- Pea Gravel (3/8 inch): Smooth, rounded river gravel preferred for decorative garden walkways.
- Tonnage Conversion Rule of Thumb: One cubic yard of gravel weighs approximately 2,800 to 3,000 pounds (1.4 to 1.5 tons). Multiply total cubic yards by 1.4 to estimate ordered tonnage.
- Related Material Calculators: Explore our Mulch Calculator and Cubic Yards Calculator.
Geotextile Fabric Underlayment & Drainage Slopes
When installing gravel driveways or patio subbases, placing a permeable non-woven geotextile fabric between the native soil and the gravel prevents the aggregate from sinking into the subgrade over time. Maintain a minimum 1% to 2% surface slope to ensure rainwater sheds cleanly away from foundations.
Why Calculate Gravel with ToolSpark?
Calculates both volumetric cubic yards and commercial scale weight in tons for quarry pricing.
Supports crushed stone (1.4 tons/yd³), pea gravel (1.3 tons/yd³), and dense road base (1.5 tons/yd³).
Includes standard 10% to 15% depth settling for vehicle-bearing driveway installations.
Pre-calibrated depth recommendations for walking paths (2-3"), driveways (4-6"), and French drains.
Calculate your driveway and construction material orders locally with zero data storage.