Gravel Calculator
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Gravel Calculator
How Much Gravel Do I Need?
The three numbers behind every accurate gravel order: area, depth, and density.
How much gravel you need comes down to one calculation: the area you're covering, multiplied by how deep you want the gravel layer, multiplied by the density of the gravel you've chosen. The calculator above does this automatically, but understanding the steps helps you double-check the result and order with confidence.
Measure the Area
Measure the length and width of a rectangular space, or the diameter of a circular bed, in whatever unit is easiest for you.
Choose a Depth
Pick a depth based on your project type — thin for decorative topping, deeper for a structural driveway base.
Calculate the Volume
Multiply area by depth to get volume — the physical space the gravel layer will occupy.
Convert to Weight
Multiply volume by your gravel's density to get the weight you'll actually be ordering and paying for.
Quick Example
Most professionals also add a 5–10% waste allowance on top of this figure to account for compaction, spillage, and uneven sub-base — the calculator's results can simply be scaled up by that percentage if you want a safety margin.
What Is Gravel Used For?
A material this versatile shows up in nearly every outdoor project.
- Driveways — a compacted gravel base handles vehicle weight while draining well, far cheaper than poured concrete.
- Walkways & paths — a stable, attractive surface for garden paths and pedestrian routes.
- Patios — a compacted base layer topped with a finer decorative gravel for outdoor living spaces.
- Drainage systems — French drains and trenches use clean, permeable stone to move water away from foundations.
- Foundations & slabs — a gravel sub-base provides stable, well-draining support beneath concrete.
- Landscaping beds — decorative gravel covers planting beds, tree rings, and low-maintenance yard areas.
- Retaining walls — gravel backfill behind retaining structures manages water pressure and drainage.
- Parking areas & access roads — larger gravel surfaces support vehicle and equipment traffic at lower cost than pavement.
Types of Gravel
Different materials suit different jobs — density and shape both matter.
| Gravel Type | Typical Use | Density (kg/m³) |
|---|---|---|
| Crushed Stone | Driveways, sub-bases, angular stone that locks together | 1,600 |
| Pea Gravel | Walkways, patios, decorative ground cover | 1,600 |
| River Rock | Decorative landscaping, drainage beds | 1,522 |
| Limestone Gravel | Driveways, general fill, budget-friendly base material | 1,370 |
| Granite Gravel | Driveways, decorative use, high durability | 1,682 |
| Marble Chips | Decorative garden beds, upscale landscaping | 1,600 |
| Decorative Gravel | Ornamental ground cover, mulch alternative | 1,500 |
| Sand | Leveling and bedding layer beneath gravel or pavers | 1,602 |
Beyond material, gravel is also sold by particle size: fine gravels and pea gravel run about 2–10 mm, general-purpose crushed stone runs 10–40 mm, and larger decorative or drainage stone can exceed 40 mm. Angular crushed stone interlocks and compacts into a stable base, which is why it's the go-to choice for driveways, while smooth, rounded river rock and pea gravel are favored for decorative paths and patios where comfortable footing and appearance matter more than structural interlock.
How Many Tons in a Yard of Gravel?
One cubic yard of gravel weighs roughly 1.2 to 1.5 tons, depending on the material.
Weight from Volume
Rule of Thumb
| Gravel Type | Tons per Cubic Yard |
|---|---|
| Crushed Stone / Pea Gravel | ≈ 1.35 tons |
| River Rock | ≈ 1.28 tons |
| Limestone Gravel | ≈ 1.15 tons |
| Granite Gravel | ≈ 1.42 tons |
Because density varies by material, there's no single universal conversion — a cubic yard of dense granite gravel weighs noticeably more than a cubic yard of lighter limestone gravel. As a general planning figure, most suppliers and contractors use 1.4 tons per cubic yard for typical crushed stone, but always check the density of your specific material, or use the calculator above with your gravel type selected for an exact figure.
How Many Yards in a Ton of Gravel?
Flip the formula around to go from a delivered weight to a coverage volume.
Volume from Weight
Rule of Thumb
Worked Example
A 1-ton delivery of crushed stone covers roughly 0.74 cubic yards — enough for about 40 square feet at a 2-inch depth. Lighter materials like limestone gravel yield slightly more volume per ton, while denser materials like granite gravel yield slightly less.
Frequently Asked Questions
Everything you need to know about calculating gravel for your project.
How do I calculate how much gravel I need?
Multiply the area you're covering by the depth of gravel you want, then multiply that volume by the density of your chosen gravel type to get the total weight required.
How deep should a gravel driveway be?
Most gravel driveways use a base layer of 4 to 6 inches, sometimes with an additional top layer of 1 to 2 inches of finer decorative gravel.
Why does gravel weight vary by type?
Different gravel materials have different densities depending on the parent rock, particle shape and size, so the same volume of two different gravel types can weigh very different amounts.
How many bags of gravel do I need?
Divide your total calculated gravel weight by the weight of a single bag (commonly 20, 25, 40 or 50 kg) and round up to the nearest whole bag.
How much does a truckload of gravel cover?
Coverage depends on truck capacity and gravel depth; a 5-ton truckload spread at a 2-inch depth covers roughly 40 to 50 square meters, though this varies by gravel density.
Should I add extra gravel for waste?
Yes, most professionals recommend adding 5 to 10 percent extra gravel to account for compaction, settling, uneven ground and material spillage during delivery and spreading.
What is the difference between gravel volume and gravel weight?
Volume measures the physical space gravel occupies, typically in cubic meters or cubic feet, while weight measures its mass, typically in kilograms, tons or pounds, and the two are linked by density.
Can I use this calculator for circular areas?
Yes, the calculator includes a dedicated Circular Area mode that calculates volume and weight based on diameter and depth.
How many tons are in a yard of gravel?
Roughly 1.2 to 1.5 tons per cubic yard, depending on the gravel type — crushed stone typically comes in around 1.35 tons per cubic yard.
How many yards are in a ton of gravel?
Roughly 0.67 to 0.83 cubic yards per ton, again depending on density — about 0.74 cubic yards per ton for typical crushed stone.
Does compaction affect how much gravel I need?
Yes, loose gravel compacts over time and under foot or vehicle traffic, which is why many projects order slightly more material than the raw calculated volume to account for settling.
Can I calculate gravel cost with this tool?
Yes, enter a price per kilogram, per metric ton, or per cubic meter and the calculator will estimate total project cost alongside volume and weight.
How many truckloads of gravel will I need?
Divide your total calculated weight in tons by your chosen truck capacity and round up to the nearest whole truckload.
Is this calculator accurate for drainage projects?
Yes, the calculator works for any rectangular or circular gravel bed, including drainage trenches and French drains, as long as you enter accurate area and depth figures.
Is this gravel calculator free?
Yes, this gravel calculator is completely free to use, with no signup required.