Stone Calculator – Estimate Stone Volume, Weight & Bags
Whether you're working on a retaining wall, garden path, decorative stone border, or drainage solution, this stone calculator helps you determine how much material you need. Just enter your area dimensions and preferred stone type, and get instant estimates.
Why Use This Tool?
- Supports both imperial and metric units
- Works with circle and rectangle shapes
- Includes preset and custom stone densities
- Calculates volume in cubic yards or meters
- Gives estimates in weight and bulk bags
Formulas Used
Imperial: (L × W × D in feet) ÷ 27 = yd³; ft³ × density ÷ 2000 = tons
Metric: (L × W × D in meters) = m³; m³ × density (kg/m³) ÷ 1000 = tonnes
Always add ~10% to your order to account for compaction, spillage, and surface leveling.
Common Stone Types and Their Uses
Choosing the right type of stone depends on your project goals. Here are a few common options:
- Crushed Stone: Ideal for driveways, patios, base layers, and compaction-heavy applications.
- River Rock: Smooth and rounded, great for decorative ground cover, garden beds, and drainage areas.
- Lava Rock: Lightweight and porous, often used in landscaping for a bold visual impact and weed suppression.
Helpful Estimating Tips
- Always round up slightly to ensure you have enough material.
- Account for uneven surfaces or compaction by adding 5–10% extra volume.
- Use our Gravel Calculator for finer materials like crushed gravel or pea stone.
- Need to prep a slab or base? Try the Concrete Slab Calculator.
Frequently Asked Questions
How many bulk bags is 1 cubic yard of stone?
Since each bulk bag typically holds about 0.5 cubic yards, 1 cubic yard equals approximately 2 bulk bags.
How deep should I lay stone?
For walkways or driveways, a depth of 2–4 inches is common. For decorative areas, 1–2 inches may be sufficient.
Is this calculator suitable for all stone materials?
Yes! Simply select a preset or input your own custom density to calculate volume and weight for any type of stone or aggregate.
Important Estimate Disclaimer
The results provided by this calculator are intended as general estimates only and should not be considered precise engineering measurements. Actual material requirements, costs, and quantities can vary significantly based on site conditions, local building codes, soil type, reinforcement requirements, climate exposure, and the intended use of your project.
These calculators are designed to help you plan and budget your project more effectively, but they do not replace professional advice from a qualified contractor, engineer, or building inspector. Always verify your calculations and assumptions with trained professionals before placing material orders or commencing construction.
For more information on the assumptions, formulas, and data used in these tools, see our Data Sources and Methodology pages.
Material estimates, cost figures, and volume calculations are approximate and may not reflect your actual requirements. Always double-check dimensions and project-specific needs, and consider adding a contingency allowance for waste, over-excavation, and unforeseen conditions.
If you are unsure about any aspect of your project — including structural requirements, reinforcement needs, drainage, or load-bearing capacity — consult with a licensed professional before proceeding.