The Complete Guide to Building a Gravel Driveway
A gravel driveway is a classic, cost-effective, and durable choice for rural and suburban homes. Unlike asphalt ($3-5 per sq ft) or concrete ($6-10 per sq ft), a gravel driveway can often be installed for less than $1-2 per square foot. However, obtaining a professional finish that doesn't wash away in the first rainstorm requires proper planning, the right materials, and accurate calculation.
Why Use a Gravel Calculator?
Math errors are expensive in landscaping. If you order too little stone, you have to pay a second delivery fee (often $100-$200) for a small top-up load. If you order too much, you are stuck with a pile of rocks on your lawn. Our calculator accounts for the crucial compaction factor—the fact that loose gravel shrinks in volume as you drive on it.
The Layers of a Perfect Driveway
A long-lasting driveway isn't just a layer of rocks dumped on the grass. It's a structural system comprising three layers:
1. The Sub-Base (Bottom Layer)
This is large, jagged rock (often called #3 stone or "fist-sized" rock). It provides drainage and
prevents the driveway from sinking into the mud.
Depth: 4 inches.
2. The Base (Middle Layer)
This is typically "Crusher Run," "CR-6," or "Road Base." It is a mix of granite chunks and fine stone
dust. When wet and compacted, the dust acts like cement, locking the rocks together into a hard,
semi-solid surface.
Depth: 4 inches.
3. The Surface (Top Layer)
This is the decorative layer you see. Usually #57 stone (standard driveway gravel, about the size of
a quarter) or pea gravel (smooth and round).
Depth: 2-3 inches.
Warning: Do not make this layer too thick (over 3 inches) or cars will feel like they are
driving in quicksand.
Calculating Requirements Manually
If you trust the calculator but want to check the math, here is the formula:
- Find Volume in Feet: Length × Width × (Depth in inches / 12) = Cubic Feet.
- Convert to Yards: Cubic Feet / 27 = Cubic Yards.
- Find Base Weight: Cubic Yards × 1.4 (typical density in tons/yd) = Base Tons.
- Add Compaction: Base Tons × 1.1 = Total Tons to Order.
Material Selection Guide
- #57 Stone: The standard. Angular, grey, locks together. Best for slopes.
- Pea Gravel: Round, colorful, aesthetically pleasing. Must be contained with edging or it will migrate. Not recommended for steep driveways as tires will spin.
- Jersey Yellow / Cream: A decorative local stone popular in certain regions. More expensive ($50-100/ton) than standard grey ($25-40/ton).
- Dense Graded Aggregate (DGA) / Quarry Process (QP): Best for the base layer, not the top layer (unless you don't mind a dusty/dirt-road look).
Cost Estimation
The cost of gravel varies wildly by region and distance from the quarry.
Material Cost: $20 - $60 per ton.
Delivery Cost: $100 - $150 per truckload (usually up to 20 tons).
Labor/Spreading: If hiring a pro to grade and spread, add $40-$80 per hour of
equipment time.
Maintenance Tips
- Crown the Driveway: The center should be slightly higher than the sides so water runs off into the grass, not down the center of the driveway (which causes ruts).
- Rake Regularly: Use a box blade or landscape rake to pull loose gravel from the edges back to the center depressions.
- Weed Control: A thick base (8+ inches total) prevents most weeds. For surface weeds, spot treat or use a propane torch weeder.