Gravel Calculator — Volume, Weight & Cost Estimator | calcsdone
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Gravel Calculator

This gravel calculator determines the volume, weight, and approximate cost of the gravel you’ll need for a driveway, walkway, or bed, based on the area and depth you enter.

Also known as: gravel calculator, gravel estimator, crushed stone calculator, gravel yardage calculator, gravel tonnage calculator.

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Author: calcsdone Editorial Team
Last updated: August 1, 2026 Densities referenced against USGS & FHWA aggregate data
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Enter Values
Gravel calculator formula: Area × (Depth ÷ 12) ÷ 27 = cubic yards
Most gravel and crushed stone runs 2,600–2,800 lbs per cubic yard
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Quick presets
Common materials
Area
0
sq ft
Volume Needed
0.00
cubic yards
Weight
0.00
tons
Estimated Cost
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Enter a price per ton to estimate cost
Calculation Breakdown
Enter your details above
Estimate only: this gravel calculator’s results are meant for planning. Since actual bulk density varies by supplier, confirm pricing and the precise material density before you order, and add roughly 10% extra to account for uneven ground and compaction. All computations run locally in your browser, so no data is moved or saved. The references this calculator is based on are listed under Sources & Methodology below.
Why use this calculator

Why Use a Gravel Calculator Before You Order

Gravel is delivered and quoted in two separate units: tons for weight and cubic yards for volume. Because most vendors charge by the ton while most people picture their project in square feet, a gravel calculator has to bridge that gap in a single step — converting a length-and-width (or diameter) footprint plus a target depth into cubic feet, then cubic yards, then applying a material density to arrive at the tonnage a supplier will actually invoice.

Skipping this step is the most common way people either run short mid-project or overorder and pay for material they never spread. Since depth is entered in inches while area is in feet, a manual estimate is prone to a unit-conversion error — dividing by 12 for depth and then by 27 for cubic yards is exactly the kind of math a calculator handles more reliably than doing it by hand on a delivery-day deadline.

Different materials also carry meaningfully different weights for the same volume, since river rock, crushed stone, and pea gravel each settle into slightly different density ranges. For this reason, this calculator lets you select a common material preset or enter a specific figure rather than assuming one number works for every load.

How it works

How This Gravel Calculator Works

Gravel is supplied by volume (cubic yards) or weight (tons), but you can determine how much you need with a straightforward area-and-depth calculation.

The formula

Volume = Area × (Depth ÷ 12) ÷ 27. Multiplying area in square feet by depth in feet gives cubic feet, and dividing that result by 27 gives cubic yards.

Rectangular vs circular

Rectangular area is length × width. Circular area is π × (Diameter ÷ 2)² — useful for round fire pits, tree rings, or planters.

Typical material densities

Materiallbs / cy
Pea gravel2,800
Crushed stone2,700
River rock2,650
Sand2,600

What this doesn’t include

Because compaction allowance, transportation expenses, and sales tax vary by supplier, most vendors recommend buying roughly 10% extra to cover them.

Common mistakes & edge cases

Calculator Mistakes to Avoid

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Entering depth in feet instead of inches

This gravel calculator internally converts depth from inches, so typing “3” as three feet rather than three inches will overstate the volume required by a factor of twelve.

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Not accounting for compaction

Loose gravel settles after being driven or stepped on. As a result, the final coating often ends up thinner than expected when the exact predicted volume is ordered without extra — most vendors suggest buying about 10% more.

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Using a generic density for every material

River rock, crushed stone, and pea gravel each weigh a different amount per cubic yard. Because of that, using one density figure for a different material can distort both the tonnage and the resulting cost estimate.

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Forgetting delivery minimums and fees

This cost estimate simply multiplies tons by the price per ton. However, most vendors also impose minimum purchase sizes or delivery fees, so treat this as a starting point until you have a firm quote.

FAQ

Gravel Calculator FAQ

How deep should my gravel layer be?+
A base layer beneath pavers or a shed should be 4–6 inches, a driveway should be 3–4 inches, and a walking path should be roughly 2 inches. That said, the exact depth for your project will vary depending on the use case.
Should I order extra gravel beyond the calculated amount?+
Yes — most people add around 10% to account for compaction, uneven ground, and spillage during spreading, since a little extra helps avoid a second delivery trip.
Why does the calculator ask for a density?+
Volume alone tells you how much area the gravel fills, but suppliers typically sell by weight (tons). Density is what converts your volume into the actual tonnage you’ll be quoted and billed for.
Do I need to know the exact density of my gravel?+
Not precisely — the built-in density presets cover the most common materials within an acceptable range. Even so, for the most precise weight estimate, use the density figure your supplier provides.
Is the cost estimate accurate?+
It’s only as accurate as the price per ton you enter, and it doesn’t account for shipping fees, minimum order charges, or tax. Use it as a starting point before contacting your supplier for a definitive quote.
Sources & methodology

Gravel Calculator: Reference Data

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