Gravel Driveway Calculator
A gravel driveway calculator multiplies length × width × depth ÷ 27 by 1.4 tons per yd³: a 40 × 12 ft driveway at 5 in needs 10.37 tons, or 11.41 with waste.
What your order looks like
One bulk delivery is usually easier than hauling it yourself.
7.41 yd³ · 10.4 tons
100 wheelbarrow trips (2 cu ft each)
14 pickup loads (0.75 ton each)
2 small dump truck loads (6 tons each)
Rules of thumb: A wheelbarrow trip is 2 cubic feet of heavy material, about 200 lb, a load most people can push. A pickup load is 0.75 ton, the payload of a full-size half-ton pickup (1,500 lb). A small single-axle dump truck carries about 6 tons.
Gravel driveway calculator: tons for your drive
A gravel driveway calculator takes the length, width, and stone depth and converts them to tons. The method is volume first: length × width × depth in feet, divided by 27 for cubic yards. Then weight: cubic yards × 1.4 tons. A driveway 40 ft long and 12 ft wide at 5 inches deep is 7.41 yd³, which is 10.37 tons, or 11.41 tons with the 10 percent allowance ticked.
The default depth of 5 inches sits in the middle of the common 4 to 6 inch range for driveway stone.
The formula in plain words
Picture a long, flat ribbon of stone. It has a length, a width, and a thickness. Multiply those to find how much stone there is. Then weigh each cubic yard.
- Depth in feet = inches ÷ 12
- Cubic yards = length × width × depth in feet ÷ 27
- Tons = cubic yards × 1.4
- With waste = tons × 1.10 when the box is ticked
- Cost = tons × price per ton
Worked examples
- Short driveway, 40 ft × 12 ft, 5 in deep, $50 per ton
- Depth: 5 ÷ 12 = 0.417 ft
- Volume: 40 × 12 × 0.417 = 200 ft³ = 7.41 yd³
- Tons: 7.41 × 1.4 = 10.37 tons, or $518.52
- With waste: 11.41 tons, or $570.37
- Long driveway in two layers, 60 ft × 12 ft
- Base layer, 4 in: 720 ft² × 0.333 ÷ 27 = 8.89 yd³ = 12.44 tons
- Top layer, 3 in: 720 ft² × 0.25 ÷ 27 = 6.67 yd³ = 9.33 tons
- Combined: 21.77 tons, or 23.95 tons with 10 percent extra
Run the calculator once for each layer, since each can have its own depth and its own stone.
Tons needed at 5 inches
| Driveway | Cubic yards | Tons | With 10% waste |
|---|---|---|---|
| 20 ft × 10 ft | 3.09 | 4.32 | 4.75 |
| 40 ft × 12 ft | 7.41 | 10.37 | 11.41 |
| 60 ft × 12 ft | 11.11 | 15.56 | 17.11 |
Depth and what it buys you
| Depth | Typical role |
|---|---|
| 2 to 3 in | Refreshing the surface of an existing driveway |
| 4 to 6 in | Working layer for a standard driveway |
| 8 in or more total | Multi-layer new build or soft ground |
Thicker layers last longer, but they cost more. Deeper stone should be placed and compacted in lifts rather than all at once.
How to measure your driveway
- Length: From the street edge or garage door to the end of the stone.
- Width: The full drivable width, not just the tire tracks.
- Widening areas: If the driveway flares near the road or garage, split it into a rectangle and a triangle and add the volumes.
- Turnarounds: Add them as separate rectangles.
- Slope: On steep drives, water can wash stone downhill. Use the slope calculator to check your grade.
Common mistakes
- Using one layer for a new build. A single thin layer on soft soil will rut quickly.
- Skipping compaction. Loose stone does not carry weight.
- Choosing rounded stone. Round gravel rolls under tires. Angular stone like crusher run locks together.
- Forgetting drainage. A crowned surface and side ditches keep water from undermining the driveway.
- Ordering the bare minimum. Edges thin out and stone settles into the base, so the waste box helps.
Planning the delivery
Ask your supplier how much a truck carries, then divide. For 10.37 tons, a truck with a 12 ton limit makes one trip. For the 21.77 ton two-layer job, expect at least two.
Have the load dumped at the start of the drive, not in the middle. Spread it with a rake or a tractor blade, and compact each layer before the next goes down. A slight crown in the center lets water run to the sides.
Related calculators
For the general-purpose version with circle and triangle shapes, use the gravel calculator. To price the job including delivery, see the gravel driveway cost calculator. If you want a decorative surface, the pea gravel calculator covers lighter stone.
Frequently asked questions
What's the best depth for a gravel driveway?
Around 4 to 6 inches of compacted stone is common for the working layer over a firm base, and heavier vehicles like trucks and RVs push toward the top of that range. New builds on soft ground often use several layers for a thicker total. Check local practice.
Do I need a base layer under a gravel driveway?
Most gravel driveways use a coarser base layer topped with a finer surface stone. This calculator sizes one layer at a time at one density, so run it once per layer and add the tons. Example: a 4 in base plus a 3 in top over 60 × 12 ft is 12.44 + 9.33 = 21.77 tons before waste.
How wide should a gravel driveway be?
A single-car driveway is commonly 10 to 12 feet wide, and 16 to 20 feet allows two cars to pass. Add width for turnarounds and curves, where vehicles swing wider than the straight run.
How much does a gravel driveway cost per ton?
Prices depend on region, stone type, and delivery distance. This calculator starts at $50 per ton as a placeholder, so enter your supplier's quote. A 40 × 12 ft driveway at 5 inches is 10.37 tons, so each $10 change per ton moves the total by about $104.
Why use tons instead of cubic yards?
Quarries typically sell aggregate by the ton and weigh each truck. Cubic yards depend on how loose the stone is. This calculator shows tons from a density of 1.4 tons per yd³, so confirm that figure with your supplier.
Estimates only. Verify quantities with your supplier before purchasing.