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Stone Calculator: How Much Stone Do I Need?
Your next home project is just a stone’s throw away
Photo: Nicolas St-Germain/ Adobe Stock
Photo: Nicolas St-Germain/ Adobe Stock
Highlights
Knowing your volume requirements is key when working with stone.
Different gravel sizes will have different weights.
Some projects require area calculations, not volume.
You may need to use multiple formulas to determine how much stone you need.
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When working with stone, knowing how much you need is essential to avoid overpurchasing or running out of materials. This guide will walk you through all the calculations required when working with stone to determine the right amount of material for your project.
How Much Stone Is Needed for Common Projects?
This article covers crushed stone and stone used for flat projects like stone pathways or facades. Almost all stone projects will fit into these two categories. The table below shows estimated stone requirements for common projects.
| Project | Measurements | Stone Requirements |
|---|---|---|
| Retaining wall | 10 ft. x 2 ft. x 3 ft. | 60 cu. ft. or 2.2 cu. yd. |
| Footpath | 20 ft. x 3 ft. x 4 in. | 20 cu. ft. or 0.8 cu. yd. |
| Patio base | 12 ft. x 12 ft. | 48 sq. ft. |
| Gravel driveway | 40 ft. x 10 ft. x 4 in. | 134 cu. ft. or 4.9 cu. yd. |
| French drain | 30 ft. x 1 ft. x 1 ft. | 30 cu. ft. or 1.2 cu. yd. |
| Firepit base | 6-ft. diameter x 3 in. | 7.1 cu. ft. or 0.3 cu. yd. |
There are some important things to keep in mind:
1 cubic yard is 3x3x3 feet (27 cubic feet in a cubic yard).
1 cubic foot is 12x12x12 inches (1,728 cubic inches in a cubic foot).
All volume is shown as a unit to the third power (example: ft³, m³, in³).
How to Calculate Stone Requirements
Photo: Irina/ Adobe Stock
Most stone projects are standard rectangular ones like driveways, drains, and walls. Use the following formula to calculate the volume of stone required:
Volume of a Rectangle = Length (in feet) x Width (in feet) x height (in feet)
For cylindrical projects, use the following formula:
Volume of a Cylinder = π x Cylinder Radius (squared) x Cylinder Height
To find the radius, measure from one end of the circle to the other and divide by two. If you can’t measure straight across, wrap a measuring tape around the cylinder to find the circumference. Then, use the following formula to find the radius: radius = circumference / (2 x π).
How to Measure for Volumetric Projects
Retaining walls, chimneys, drains, and other projects commonly require calculations that result in cubic measurements (volume amounts). For projects with hard angles like rectangles and squares, you’ll always need three measurements: the length, width, and height. For pillars and other cylindrical projects, you’ll only need the height and radius.
How to Measure Stone Facade Projects
For projects where you’ll just need to cover something—wall, walkways, et cetera—you only need square footage requirements. Assuming you’ll be using a flat stone like flagstone, you’ll need two measurements for your project: the length and height.
For triangles, measure the length of the triangle’s base, multiply by the height from the base to the tip of the triangle, and then divide by two.
Who to Hire to Measure and Install Stone
Homeowners interested in stone projects should talk to a local masonry pro. They’ll be able to accurately determine stone requirements, which stone is best for your project, and provide an accurate quote for completion.
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