How deep should gravel be for a driveway?

A residential driveway typically needs 6 to 8 inches of total depth, usually built in layers: a coarse base, a middle layer, and a finer top course, each compacted before the next is added. Paths and decorative beds need far less, often 2 to 4 inches.

How many cubic yards are in a ton of gravel?

It depends on density. At about 100 lb per cubic foot, one cubic yard weighs roughly 2,700 lb, so a ton is around 0.74 cubic yards. Denser crusher run gives fewer yards per ton, lighter pea gravel slightly more.

Should I order by weight or volume?

Follow whichever unit your supplier quotes in. This calculator reports both, so you can order in tons from a quarry or in cubic yards from a landscape supplier without converting yourself.

How much extra should I order?

Between 5% and 15% depending on the job. Compaction alone can consume around 10% of loose volume, and uneven ground absorbs more than the arithmetic suggests. Running short mid-project usually costs more than the extra material.

What is a bulk density and why does it matter?

Bulk density is the weight of loose material per cubic foot, typically 90-130 lb/ft³ for gravel and crushed stone. It converts a volume into a weight, which matters because most quarries invoice by the ton, not the cubic yard.

Do I need to compact gravel in layers?

For anything carrying vehicle loads, yes. Compacting one thick layer rarely achieves uniform density all the way through; contractors typically place and compact 2-4 inch lifts so each layer is fully consolidated before the next is added.

Is there a minimum gravel delivery quantity?

Many quarries and landscape suppliers set a minimum load, often several tons or a set number of cubic yards, and add a flat trip charge below that amount. Check with the supplier before assuming the price-per-ton quote applies to a small order.

Does gravel need a fabric or liner underneath?

For driveways, paths and parking areas over native soil, a geotextile fabric between the subgrade and the base course is standard practice. It separates the gravel from the soil, which reduces rutting and the need for future top-ups.

Construction Materials

Gravel Calculator – How Much Gravel Do I Need?

This gravel calculator works out how much stone a driveway, walkway, patio base or drainage bed needs. Enter the length, width and depth — in feet, inches, yards or metric — pick the material so the right density is applied, and you get the volume in cubic feet, cubic yards and cubic meters, the weight in US tons, and an estimated delivered cost. Suppliers sell gravel by the cubic yard or the ton, so both numbers are shown together.

How much gravel do I need?

Multiply length × width × depth (all in feet) to get cubic feet, divide by 27 for cubic yards, then multiply by the material's bulk density and divide by 2,000 for short tons. A 40 ft × 12 ft driveway at 4 inches deep is 160 ft³, about 6.5 yd³ once a 10% compaction allowance is added — roughly 8.8 tons of crushed stone at 100 lb/ft³.

Key takeaways

Volume scales directly with depth, so a small error in the depth entry changes the total by the same percentage.
Bulk density varies by material — angular crushed stone weighs more per cubic foot than rounded pea gravel.
Driveways are typically built in compacted lifts of 2-4 inches each, not one loose layer.
A 5-15% waste allowance covers compaction settling, spillage and an uneven subgrade.
Suppliers price by the ton or the cubic yard with a delivery minimum, so round up rather than order the exact calculated figure.

Enter your details

Area

Length

Length unit

Width

Width unit

Depth

Depth unit

Material

Waste / compaction allowance

Loose gravel settles when compacted; 5-15% extra is normal.

Cost

Price per ton (delivered)

Delivery or haul fee

Gravel needed

6.52 cubic yards

8.8 tons at 100 lb per cubic foot

Weight: 8.8 tons
Estimated cost: $396

Volume

Base volume: 160 ft³
Waste allowance (10%): 16 ft³
Total volume: 176 ft³
Cubic yards: 6.52 yd³
Cubic meters: 4.98 m³

Weight & cost

Density used: 100 lb/ft³
Total weight: 17,600 lb
Short tons: 8.8
Material cost: $396
Delivery: $0
Estimated total: $396

Suppliers usually sell by the ton or the cubic yard and may have minimum order quantities. Round up when ordering.

Your result is an estimate based on the information entered.

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HomeCalc USA — Gravel Calculator

Generated

Inputs

Length: 40
Length unit: Feet
Width: 12
Width unit: Feet
Depth: 4
Depth unit: Inches
Material: Crushed stone (~100 lb/ft3)
Waste / compaction allowance: 10
Price per ton (delivered): 45
Delivery or haul fee: 0

Results

Gravel needed: 6.52 cubic yards

Base volume: 160 ft³
Waste allowance (10%): 16 ft³
Total volume: 176 ft³
Cubic yards: 6.52 yd³
Cubic meters: 4.98 m³
Density used: 100 lb/ft³
Total weight: 17,600 lb
Short tons: 8.8
Material cost: $396
Delivery: $0
Estimated total: $396

Assumptions

The area is rectangular and the depth is uniform.
Density is the loose bulk density of the material as delivered.
The waste allowance covers compaction and spillage.
One short ton is 2,000 pounds.

Estimates are for informational purposes only and may differ from actual costs, lender offers, tax assessments or contractor quotes.

What your result means

The primary result is the order volume, already including your waste allowance, shown in cubic yards (how landscape suppliers usually quote) and tons (how quarries usually quote). The weight depends entirely on the density you selected — switching from pea gravel to crusher run can change the tonnage by 20% or more for the same volume.

How to use this calculator

Measure the area to be covered and enter its length and width, choosing the unit that matches your tape measure — you can mix units, for example feet for length and inches for depth.

Depth is the finished thickness of the gravel layer. Typical figures are 2-3 inches for a walking path, 4 inches for a decorative layer or drainage bed, and 6-8 inches (often in two or three compacted lifts) for a driveway that carries vehicles.

Select the material so the correct density is used, or enter your own if your supplier publishes one. Add a waste allowance to cover compaction, spillage and uneven subgrade.

For irregular areas, split the space into rectangles, run the calculator for each and add the results together.

What each input means

Input	What it means
Length / width	Footprint of the area in plan view, measured at ground level.
Depth	Finished, compacted thickness of the layer — not the loose depth before compaction.
Material	Sets bulk density in lb/ft³; pick the closest preset or enter a supplier-specific figure.
Waste / compaction allowance	Extra volume for settling, spillage and subgrade irregularity.
Price per ton	Delivered price from the quarry or landscape supplier, including hauling if bundled.

Formula used

Volume (ft³) = length (ft) × width (ft) × depth (ft)

Depth entered in inches is converted first: inches ÷ 12 = feet.

Cubic yards = cubic feet ÷ 27

Tons = cubic feet × density (lb/ft³) ÷ 2,000

The waste allowance multiplies the base volume: total = base × (1 + waste ÷ 100). Cost is the tonnage multiplied by the price per ton, plus any flat delivery charge.

Worked example

A driveway 40 ft long and 12 ft wide with 4 inches of crushed stone:

40 × 12 × (4 ÷ 12) = 160 cubic feet

Adding a 10% compaction allowance gives 176 cubic feet, which is 6.52 cubic yards. At 100 lb/ft³ that weighs 17,600 lb, or 8.8 short tons. At $45 per ton delivered, the material cost is about $396.

For a two-lift driveway base, run the calculator twice: once for a 4 inch sub-base at a coarser density and again for a 2 inch top course, then add the two cubic-yard results together for the total order.

How many cubic feet are in a cubic yard of gravel?

27 cubic feet make one cubic yard (3 ft × 3 ft × 3 ft). Landscape yards often sell loose material by the cubic yard, while quarries sell by the ton, so this calculator converts between both units and cubic meters automatically.

What is the difference between gravel and crushed stone?

Gravel is naturally rounded rock, typically screened from riverbeds or pits. Crushed stone is mechanically fractured into angular pieces that interlock and compact more tightly, which is why crusher run and road base presets carry a higher bulk density than loose pea gravel.

Do I need geotextile fabric under gravel?

For driveways and paths over soil, yes. A woven or non-woven geotextile fabric laid on the compacted subgrade stops the base course from mixing into the soil beneath it, one of the most common causes of ruts and soft spots in gravel driveways.

Factors that change the result

Bulk density: Angular crushed stone packs tighter and weighs more per cubic foot than rounded gravel, directly changing the tonnage for the same volume.
Moisture content: Wet gravel weighs more than the dry bulk-density figure suggests; some quarries adjust ticket weights for moisture.
Compaction in lifts: Vehicle-rated driveways need base courses compacted in 2-4 inch lifts rather than dumped and driven over once.
Subgrade condition: Soft or uneven soil absorbs extra depth as the first lift settles into it, beyond what the waste percentage predicts.
Edging and geotextile fabric: Fabric and edge restraints keep gravel from migrating into surrounding soil or lawn, reducing long-term top-ups.
Drainage design: A crowned or sloped surface with adequate base depth prevents standing water, which otherwise washes fines out of the top layer.

Common mistakes to avoid

Entering loose depth instead of compacted depth
Loose gravel compacts by roughly 10-20%, so ordering only the finished depth without an allowance leaves the layer thinner than planned.
Skipping the waste allowance on drainage beds
French drains and drainage beds still lose material to settling and to voids around perforated pipe.
Ordering by the wrong unit
Confusing cubic yards with tons produces very different quantities; confirm which unit your supplier's price applies to.
Ignoring supplier minimum loads
Many quarries charge a flat trip fee or set a minimum tonnage, so a slightly larger order can be cheaper per ton.
Using one uniform depth on a sloped driveway
A driveway with a grade change often needs a stepped or variable depth to keep the surface level and properly drained.

Practical tips

Measure depth in inches for accuracy — small fractions of a foot are easy to mis-key.
Ask the supplier for the specific bulk density of their stock rather than relying on a generic preset for large orders.
Order a few extra tons for a driveway; leftover gravel stores easily and covers future top-ups.
Use geotextile fabric between the subgrade and base course on any driveway or path over native soil.
For drainage applications, choose open-graded, washed stone so water passes through instead of pooling.

When the estimate may differ from reality

Actual delivered tonnage can differ from this estimate because of moisture content, the exact density of the quarry's stock, and any minimum load or short-haul fee. Compacted depth also depends on how well the base is prepared and rolled, so measure a finished section before assuming the whole job matches the estimate exactly.

Assumptions and limitations

What this calculator assumes

The area is rectangular and the depth is uniform.
Density is the loose bulk density of the material as delivered.
The waste allowance covers compaction and spillage.
One short ton is 2,000 pounds.

What it does not account for

Sub-base preparation, geotextile fabric and edging materials.
Excavation or removal of existing surface material.
Sales tax, fuel surcharges and minimum load fees.
Slope, drainage design and load requirements for vehicle traffic.

Frequently asked questions

How deep should gravel be for a driveway?: A residential driveway typically needs 6 to 8 inches of total depth, usually built in layers: a coarse base, a middle layer, and a finer top course, each compacted before the next is added. Paths and decorative beds need far less, often 2 to 4 inches.
How many cubic yards are in a ton of gravel?: It depends on density. At about 100 lb per cubic foot, one cubic yard weighs roughly 2,700 lb, so a ton is around 0.74 cubic yards. Denser crusher run gives fewer yards per ton, lighter pea gravel slightly more.
Should I order by weight or volume?: Follow whichever unit your supplier quotes in. This calculator reports both, so you can order in tons from a quarry or in cubic yards from a landscape supplier without converting yourself.
How much extra should I order?: Between 5% and 15% depending on the job. Compaction alone can consume around 10% of loose volume, and uneven ground absorbs more than the arithmetic suggests. Running short mid-project usually costs more than the extra material.
What is a bulk density and why does it matter?: Bulk density is the weight of loose material per cubic foot, typically 90-130 lb/ft³ for gravel and crushed stone. It converts a volume into a weight, which matters because most quarries invoice by the ton, not the cubic yard.
Do I need to compact gravel in layers?: For anything carrying vehicle loads, yes. Compacting one thick layer rarely achieves uniform density all the way through; contractors typically place and compact 2-4 inch lifts so each layer is fully consolidated before the next is added.
Is there a minimum gravel delivery quantity?: Many quarries and landscape suppliers set a minimum load, often several tons or a set number of cubic yards, and add a flat trip charge below that amount. Check with the supplier before assuming the price-per-ton quote applies to a small order.
Does gravel need a fabric or liner underneath?: For driveways, paths and parking areas over native soil, a geotextile fabric between the subgrade and the base course is standard practice. It separates the gravel from the soil, which reduces rutting and the need for future top-ups.

Sources and references

NRMCA — aggregates in construction — Background on aggregate materials used in construction.

How Much Gravel Do I Need?Convert length, width and depth into cubic yards and tons of gravel, choose a realistic depth, and understand why tonnage varies by product.
How Much Concrete Do I Need?Calculate concrete for slabs, footings and post holes in cubic yards, with two worked examples, mix strength guidance and ready-mix ordering tips.
Asphalt Installation, Resurfacing, and Sealing: Cost DifferencesWhat each asphalt driveway job includes, which line items drive cost, how to compare quotes fairly and why a national average isn't a local price.