Gravel Calculator

A gravel calculator is a planning tool that tells you exactly how much gravel you need to cover a driveway, walkway, patio base, drainage trench, or landscaping area — measured in cubic yards, tons, and total cost. Gravel is sold by volume (cubic yards) or by weight (tons), and switching between the two can be confusing because different gravel types weigh different amounts. This calculator handles those conversions for you so you order the right quantity the first time.

The tool works by multiplying the area of each section by your chosen depth to find the volume, applying a waste factor for compaction and uneven ground, then converting that volume into tons using the density of your selected gravel type. It also estimates total project cost based on bulk pricing and optional delivery. Ordering accurately matters: too little gravel means thin, weak coverage, while too much wastes money and leaves you with piles to haul away. According to the U.S. Department of Agriculture, properly sized aggregate layers are essential for drainage and load-bearing performance in rural roads and driveways.

Gravel isn't a single material — it's a family of crushed and natural stone products, each suited to specific jobs. Choosing the right one affects how well your project drains, how long it lasts, and how it looks. Crushed stone (#57) is the workhorse of landscaping: golf-ball-sized angular stones that drain well and form a stable base for driveways, French drains, and patio foundations. Crushed base (road base or "crusher run") blends stone with fine dust that compacts into a hard, near-solid surface, making it ideal as a driveway base layer.

Pea gravel is small, smooth, and rounded — comfortable for walkways and play areas but prone to shifting underfoot since the rounded shapes don't lock together. River rock is larger and decorative, perfect for dry creek beds and accent borders but not for surfaces you'll walk or drive on regularly. Limestone offers a clean, light color and compacts well, popular for both driveways and decorative use.

For load-bearing projects, the foundation matters as much as the surface. A proper gravel driveway starts with a compacted subgrade, followed by a coarse base layer, a middle binding layer, and a finishing top layer. Each lift should be compacted before adding the next. Adding landscape fabric between the soil and gravel prevents the two from mixing and stops weeds from pushing through. For more on aggregate gradation and proper construction methods, the Federal Highway Administration publishes detailed standards used by professionals for everything from rural roads to drainage systems.