Pea Gravel Calculator
Calculate exact pea gravel needed in cubic yards, tons, bags, and truckloads. Free calculator with waste factor, coverage area, and cost estimation.
Accurate estimation of pea gravel yards, tons, bags, coverage area, and material costs for any landscaping project.
Material Order Summary
| Measurement Metric | Base Requirement | Final Requirement (incl. Waste) |
|---|
| Layer Depth | Yards Required for This Area | Coverage per Yard (sq ft) |
|---|
Free Online Pea Gravel Calculator - Estimate Yards, Tons, Bags & Project Costs
Our free online pea gravel calculator helps you estimate the precise volume, weight, bag count, and material cost for any hardscaping or landscaping project. Whether you are laying a decorative pea gravel walkway, installing a gravel driveway, creating a fire pit patio, or adding drainage ground cover, this tool provides instant measurements in cubic yards, tons, and bags to ensure you order the right quantity without overspending.
Why Use This Pea Gravel Calculator?
Calculating aggregate cover manually can lead to under-ordering or costly material waste. This calculator solves that challenge with multi-shape geometry support, custom waste allowances, and material weight conversions.
- Accurate Volume Estimates: Computes exact cubic feet and cubic yards required based on custom length, width, and layer depth.
- Weight & Bulk Conversions: Automatically converts cubic yards to US tons and metric tonnes using realistic pea gravel bulk densities.
- Bag vs Bulk Order Breakdown: Shows exact bag quantities for 0.5, 0.75, and 1.0 cubic foot bag sizes alongside bulk truckload estimates.
- Multi-Shape Flexibility: Supports rectangles, circles, ovals, triangles, trapezoids, L-shapes, and multi-section landscape designs.
- Built-in Waste & Settlement Allowance: Lets you apply a 5% to 20% factor for irregular edges, grade variations, and soil settling.
How to Use This Free Pea Gravel Calculator Online
- Select Your Project Type: Choose a preset like garden path, patio, or driveway to load recommended depth guidelines.
- Choose Your Project Shape: Select the geometric outline of your area (rectangular, circular, multi-section, etc.).
- Enter Dimensions: Input measurements in feet, inches, or meters for length, width, diameter, or radius.
- Set Gravel Depth: Enter your intended finished layer depth (standard walkways usually require 2 to 3 inches, while driveways need 4 to 6 inches).
- Adjust Advanced Options (Optional): Customize the waste factor, material bulk density, or add optional base material and delivery costs.
- Click Calculate: Instantly view cubic yards, total weight, recommended bag count, and optional cost breakdowns.
Pea Gravel Formula & Methodology
The standard volume formula for calculating pea gravel over a rectangular surface area is:
Cubic Feet = Area (sq ft) × [Depth (inches) ÷ 12]
To convert cubic feet into bulk commercial purchasing units:
Cubic Yards = Cubic Feet ÷ 27
Standard wet/compacted pea gravel has an estimated bulk density of 2,700 lbs per cubic yard (100 lbs per cubic foot). Thus, total weight in US tons is calculated as:
US Tons = (Cubic Yards × 2,700) ÷ 2,000
For example: A 20 ft by 15 ft patio (300 sq ft) covered at a 3-inch depth yields 75 cubic feet of pea gravel. Dividing by 27 gives 2.78 base cubic yards. Adding a 10% waste factor results in 3.06 cubic yards, which equals approximately 4.13 US tons or 165 bags (0.5 cu ft each).
Key Features of This Calculator
- Coverage at Alternative Depths: Generates a side-by-side table comparing material requirements across 1-inch to 6-inch layer depths.
- Optional Construction Extras: Estimates crushed stone base layers, soil excavation yardage, and landscape fabric roll counts.
- Project Cost Breakdown: Factor in unit prices per yard, per ton, or per bag alongside flat delivery fees and labor charges.
- Save, Print & Copy Options: Easily copy order summaries to clipboard or print a project specification sheet for your local aggregate supplier.
Limitations
- Density variations occur depending on quarry moisture content and stone size distribution (ranging between 2,600 and 2,800 lbs/yd³).
- Manual site excavation depths can vary; uneven subgrade surfaces require additional material.
Pro Tips for Installing Pea Gravel
- Use a Compacted Base: For high-traffic walkways and driveways, install 2 to 4 inches of compacted crushed road base beneath a 2-inch top layer of pea gravel to prevent sinking.
- Install Sturdy Edging: Pea gravel migrates easily. Install brick, metal, or composite edge restraints elevated 0.5 inches above the gravel line.
- Lay Heavy-Duty Landscape Fabric: Always lay woven geotextile fabric between the soil and gravel to stop weed growth and prevent stone migration into subsoil.
Have questions about installation or sizing? Check out view our frequently asked questions below for additional guidance.
