Introduction
This aggregate calculator helps you figure out how much stone, gravel, or sand you need for your project. Just enter the shape and size of your area, add the depth of material, and the tool calculates how much you need. It gives you the total volume in cubic feet and cubic yards, then converts that into tons based on the density of your material.
You can add up to 10 areas at once, which is useful if your project has different sections with different shapes or depths. The calculator also lets you pick a geology type, like limestone or granite, to estimate density automatically. A built-in overage setting adds extra material to your order so you don't run short due to compaction, waste, or uneven edges.
This tool saves you time and helps you order the right amount of aggregate the first time, whether the job is a driveway, a foundation, or a gravel path.
How to Use Our Aggregate Calculator
Enter the shape, size, and depth of your project area along with the material density. The calculator will tell you how many tons of aggregate you need to order, including a waste factor.
Shape: Pick "Rectangle" or "Circle" for the area you want to cover. You can add up to 10 areas if your project has more than one section.
Length and Width: If you chose a rectangle, type the length and width of your area in feet. If you chose a circle, enter the diameter or radius in feet instead.
Depth / Thickness: Enter how deep you want the aggregate layer to be. Use the toggle to switch between inches and feet.
Geology Type: This is optional. Pick the rock type of your aggregate, such as limestone, granite, or traprock. This helps estimate the material density for you.
Product Type: This is also optional. Choose the kind of aggregate product, like crusher run, coarse aggregates, or screenings. Use this with Geology Type to get a density estimate.
Estimate Density: Click this button after you pick a geology type and product type. It will fill in a common density value for that combination.
Material Density: Enter the weight of the aggregate per cubic foot or per cubic yard. If you used the estimate button, this field is already filled in. You can also type your own value if you know the exact density.
Overage / Waste Factor: Enter a percentage between 0 and 50 to account for compaction, spills, and uneven edges. A 10% overage is the standard recommendation for most aggregate projects.
Calculate: Press the "Calculate" button to see your results. The calculator shows total volume in cubic feet and cubic yards, base tonnage, and final tonnage with your overage included. It also gives a per-area breakdown, a step-by-step solution, and a bar chart of tonnage by area.
What Is an Aggregate Calculator?
An aggregate calculator helps you figure out how much material you need for a construction project. Aggregate is the loose material used as a base or fill in building work. It includes things like crushed stone, gravel, sand, and limestone. You will find aggregate in driveways, walkways, foundations, and under concrete slabs.
How Aggregate Is Measured
Aggregate is sold by the ton. To know how many tons you need, you first figure out the volume of the space you want to fill. Volume is found by multiplying the area (length × width for a rectangle, or π × radius² for a circle) by the depth of material. This gives you cubic feet. You then divide by 27 to get cubic yards, since there are 27 cubic feet in one cubic yard.
Once you know the volume, you use the material's density to convert it into weight. Density tells you how heavy one cubic foot of a material is. Different types of aggregate have different densities. For example, traprock is heavier than sandstone. The geology (type of rock) and the product form (screenings, crusher run, coarse stone) both affect density.
Why You Should Add Overage
It is smart to order more aggregate than the exact amount you calculated. Material gets lost during delivery, spreading, and compaction. The ground may also have dips or uneven spots that use up extra material. A 10% overage is a common recommendation for most projects. This helps you avoid running short and needing a second delivery, which costs more time and money.
Common Uses for Aggregate
- Driveways and parking areas: crushed stone or gravel provides a stable surface.
- Foundations and footings: a layer of aggregate sits under concrete to help with drainage.
- Walkways and patios: compacted aggregate serves as a solid base for pavers or flagstone.
- Drainage and backfill: coarse aggregate like river rock or rip rap allows water to flow away from structures.
- Road base: crusher run packs tightly and supports heavy loads.
Tips for Accurate Results
Measure your area carefully before entering numbers. Use a tape measure and check twice. If your space is an odd shape, break it into smaller rectangles or circles and add them together. Always measure depth in the unit you are most comfortable with. This calculator lets you choose inches or feet. For density, you can select your rock type and product type to get a close estimate, or enter a value directly if your supplier gave you one.