What is ProMaterialCalc?

A precise concrete and slab volume estimator designed for contractors and DIYers to calculate material requirements, bag counts, and waste margins instantly.

Aggregate Estimator

Gravel & Aggregate Volume Estimator

Aggregate is quoted by volume in the yard and limited by weight on the road. Enter your area and depth to see both: cubic yards, cubic feet, short tons for the material you pick, and a bag count for smaller jobs, all adjusted by your waste factor.

Project Inputs

Material type

Length

Width

Depth

Waste Factor10%

0% exact10%20% max

Material Estimate

Total Volume Needed

1.53

cubic yards

Estimated Weight

2.06

short tons (2,000 lb)

50 lb Bags

rounded up

Bulk delivery territory: at about 2.06 tons, order this aggregate by the ton or by the cubic yard rather than by the bag.

Total cubic feet (with buffer)41.25 ft³

Base volume (no waste)1.39 yd³

AI & Summary Readout

For a 15ft x 10ft area at 3 inches deep using Crushed Stone, you require 1.53 cubic yards (approx. 2.06 tons) including your 10% waste buffer.

Estimate for planning only. Weight assumes 2,700 lb per cubic yard for Crushed Stone; moisture and compaction change the figure. Confirm the tonnage with your supplier before ordering.

Aggregate Guide

How to Calculate Gravel and Aggregate

Aggregate is quoted two different ways, and the one that matters depends on how it is delivered. Suppliers who load with a front-end loader and sell by the scoop price in cubic yards, while every truck that hauls it out of the yard is limited by weight, not by volume. Understanding both numbers before you call keeps a driveway project from arriving short or arriving as two trips instead of one.

Measure the area to be covered

Multiply length by width for a driveway, parking pad, or drainage run (15ft x 10ft = 150 sq ft). For a curved or irregular shape, break it into rectangles and add the pieces together.

Convert depth to cubic feet

Divide the depth in inches by 12 to get feet, then multiply by the square footage. A 3-inch lift is 0.25ft, so 150 sq ft x 0.25ft = 37.5 cubic feet of loose aggregate.

Convert to cubic yards

One cubic yard holds 27 cubic feet, so 37.5 cubic feet is 1.39 yards before waste. Aggregate compacts into the sub-base as it is worked in, which is why the 10% buffer is added on top of this figure, not subtracted from it.

Convert yards to tons by density

Weight is volume multiplied by the material's bulk density: cubic yards x pounds per cubic yard, divided by 2,000. Crushed stone at 2,700 lb/yd³ turns 1.53 yards into roughly 2.06 tons, and that tonnage is what actually limits a delivery truck.

Worked Example: 15ft x 10ft Driveway Pad

Surface Area

150 sq ft

15ft x 10ft

Loose Volume

37.5 ft³

150 sq ft x 0.25ft

With 10% Buffer

1.53 yd³

≈ 2.06 tons of crushed stone

Ordering that as crushed stone means asking for about 1.5 cubic yards or roughly 2 tons, and those two requests describe the same pile. At the 4-inch depth often used for a gravel driveway over bare ground, the same pad needs about 2.04 cubic yards, or close to 2.75 tons.

Why Tonnage Matters As Much As Yards

A cubic yard is a measure of space. A ton is a measure of what the road, the axle, and the truck are actually carrying, and on any legal route the second number is the binding limit.

Dump trucks are rated by payload weight, not by bed volume. A single-axle truck typically hauls around 5 to 10 tons, and a tandem-axle truck roughly 12 to 18 tons, regardless of how much the bed could physically hold.
Because aggregate is heavy, most residential orders fill only part of the bed and are limited by weight laws rather than space.
Trailer pickup is capped by the trailer's axle rating, not its box size. A light utility trailer that is rated for about 2,500 to 3,000 lb of cargo carries roughly 1.25 to 1.5 tons per trip, so a 2-ton order becomes two runs.
Suppliers quote some materials by the cubic yard and others by the ton, so having both numbers ready lets you compare quotes without guessing.
Density shifts with moisture and gradation, so a wet load of the same stone can weigh noticeably more than a dry one.

As a working shortcut, most crushed stone runs about 1.35 tons per cubic yard, so a ten-yard delivery lands near 13.5 tons. That is the number to quote when you call: it tells the dispatcher immediately whether you need one truck or two.

Crushed Stone vs. Pea Gravel

The shape of the individual stones decides how the whole layer behaves, and it matters more than color or price when you are choosing a surface.

Crushed stone: angular, locks together

Crushed stone is quarried and mechanically broken, so every piece has flat faces and sharp edges. Tamped and watered in, those faces wedge against each other and the layer becomes a firm, semi-locked surface that resists shifting under tires. It is the default for driveways, parking pads, and base courses, and it stays put on a slope.

Pea gravel: rounded, shifts and self-levels

Pea gravel is river- or shore-smoothed, so the stones are rounded and slide past one another. It rakes beautifully, drains fast, and is comfortable to walk on, which makes it ideal for paths, plant borders, and play areas. Under vehicle traffic it migrates, ruts, and can be pushed outward, so it is a poor choice for a driveway unless it is contained by edging and topped up regularly.

River rock and stone dust

River rock is larger rounded stone used decoratively in dry creek beds and borders, and it is the lightest of the four presets. Stone dust and sand are the opposite extreme: fine, dense, and engineered to compact into a flat, stable bed under pavers.

Aggregate Density Reference

These are the bulk densities used throughout this calculator. They are typical values for dry material, and the tonnage column is simply the density divided by 2,000.

Crushed Stone / Gravel2,700 lb/yd³≈ 1.35 tons/yd³Driveways, base layers, and any surface that has to lock together under vehicle weight.

Pea Gravel2,600 lb/yd³≈ 1.30 tons/yd³Walkways, drainage trenches, playgrounds, and decorative beds where smooth stone is preferred.

Sand / Stone Dust2,800 lb/yd³≈ 1.40 tons/yd³Paver setting beds, joint sand, and fine compaction layers that need to settle uniformly.

River Rock2,500 lb/yd³≈ 1.25 tons/yd³Dry creek beds, borders, and low-traffic decorative areas that drain freely.

One cubic yard spreads to about 324 sq ft at 1 inch deep and 108 sq ft at 3 inches, and one ton of crushed stone covers roughly 80 sq ft at that same 3-inch depth. When you are spreading over an existing compacted surface rather than raw ground, the low end of the waste range is usually enough, since the material has nowhere to sink.