Gravel Calculator

A gravel calculator returns the cubic yards and tons of gravel needed for a path, driveway topping, or bed. It multiplies the area by the depth, adds a waste and compaction allowance, converts the volume to cubic yards, then multiplies by the density in tons per cubic yard.

Last reviewed September 2026Method & sources Report an error

Not to scale.

Gravel Needed (with waste)

0.81 cu yd

Includes a 10% waste allowance.

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Gravel1.14 tonsAbout 0.81 cu yd.
Bagged

Breakdown
Gravel Needed (with waste)	0.81 cu yd
Gravel Needed	1.14 tons
Estimated Cost

How to Calculate Gravel

Volume is Area × Depth, with depth converted from inches to feet, and a waste/compaction allowance added since spread gravel settles somewhat under traffic and needs occasional topping up. The result converts to cubic yards, then to tons using a density figure. Gravel is sold by weight, and density genuinely varies by material (roughly 1.2 to 1.8 tons per cubic yard depending on stone type, size, and how packed it is). This is why the calculator uses an adjustable density input. It defaults to 1.4 tons per cubic yard, a commonly used planning figure for general landscape gravel, rather than a single fixed constant. Check with your specific supplier for the tested density of the exact product you're buying if precision matters.

Example: 20 ft × 3 ft path, 4 in. depth, default 1.4 tons/cu yd density

A 20 ft × 3 ft path, 4 in. depth, default 1.4 tons/cu yd density, 10% waste: 1. Area: 20 × 3 = 60 sq ft 2. Depth in feet: 4 ÷ 12 = 0.333 ft 3. Raw volume: 60 × 0.333 = 20 cubic feet 4. With 10% waste: 20 × 1.10 = 22 cubic feet 5. Cubic yards: 22 ÷ 27 ≈ 0.81 cubic yards 6. Tons: 0.81 × 1.4 ≈ 1.14 tons. A heavier stone (say, 1.6 tons/cu yd) on the same path would need about 1.30 tons instead. It's worth checking your supplier's specific product density if the difference matters for pricing or delivery.

Gravel: Compare Scenarios

Scenario	Gravel Needed (with waste)	Gravel Needed
Small (10×2 ft path)	0.20 cu yd	0.29 tons
Medium (20×3 ft path)	0.81 cu yd	1.14 tons
Large (50×10 ft driveway topping)	6.79 cu yd	9.51 tons

What Is Gravel?

A gravel calculator converts an area and desired depth into the tons of gravel needed to cover it. Tons rather than a bag or piece count, since gravel is bought and delivered by weight. It's built with an adjustable density because gravel isn't a single standardized product the way a bagged concrete mix is. Pea gravel, crushed stone, and larger decorative rock all pack to different weights per cubic yard.

Gravel: Pros and Cons

Pros

Density is adjustable rather than a single fixed number, since gravel type genuinely changes weight per cubic yard by a meaningful margin
Includes a compaction/settling allowance on top of the raw volume, since spread gravel packs down somewhat under foot or vehicle traffic
Gives the answer in tons, the unit gravel is actually priced and delivered in, alongside the cubic yard figure

Cons

Doesn't determine what depth or gravel type is right for your project. A driveway base, a decorative bed, and a drainage layer all call for different depths and materials
Assumes a simple rectangular area. An irregular path or bed needs its area estimated separately or broken into rectangular sections
The default 1.4 tons/cu yd density is a general planning figure, not a substitute for your specific supplier's tested product density

Gravel: What a Pro Checks

Match your depth to the application instead of keeping the default. A decorative top-dressing over landscape fabric might use just 2 in., while a walkway or driveway base commonly uses 4 in. or more, sometimes in multiple compacted lifts.
Check your specific supplier's tested density for a large or delivery-weight-sensitive order. Gravel density genuinely varies by stone type, size, and how packed it is, roughly 1.2 to 1.8 tons per cubic yard.

Frequently Asked Questions

How many tons of gravel do I need?

Multiply your area's volume in cubic yards by the gravel's density (commonly around 1.4 tons per cubic yard for general landscape gravel, though this varies by material). For a 20 ft × 3 ft path at 4 in. deep with 10% waste, that works out to about 1.14 tons.

How much does a cubic yard of gravel weigh?

Typically somewhere between 1.2 and 1.8 tons, depending on the specific stone type, size, and how compacted it is. There's no single universal figure the way there is for a bagged, standardized product. This calculator defaults to 1.4 tons/cu yd as a general planning figure. Check with your supplier for their specific product's density if you need precision.

What depth of gravel should I use?

It depends on the application. A decorative top-dressing over landscape fabric might use just 2 in., while a walkway or driveway base commonly uses 4 in. or more, sometimes in multiple compacted lifts for a load-bearing base. Check guidance specific to your project type rather than assuming one depth fits everything.

Why does gravel need a waste allowance if it doesn't get cut like a solid material?

Because spread and compacted gravel settles somewhat over time under foot or vehicle traffic, and some material is inevitably lost to overspill at edges during spreading. The waste allowance here covers that settling and spillage, not offcuts the way a cut material like tile would need.

Should I order gravel by the cubic yard or by the ton?

Most suppliers deliver and price gravel by the ton, since it's the actual billing weight on the delivery truck, though cubic yards are the more intuitive unit for picturing the area you're covering. This calculator gives both, so you can order in whichever unit your supplier quotes.

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