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Gravel Driveway Calculator

A driveway built to last is two layers: a thick compacted base of dense-graded stone, plus a thinner top layer of clean stone. This calculator prices nothing — it computes each layer's cubic yards and tons separately, using each layer's own material.

Step 1 · Driveway area
Step 2 · Dimensions
Step 3 · Base layer (typically 4–6" compacted)

Enter 0 to skip this layer (e.g. resurfacing only).

Step 4 · Top layer (typically 2–3" of clean stone)

A note on this estimate

Compaction removes a further 10–15% of loose depth; soft subgrade, crown shaping and vehicle duty all change the build. Layers must be sized separately, never averaged into one depth.

Last updated: 7 November 2026 · Report an error

How the driveway calculation works

Like our main gravel calculator, each layer is treated as its own volume problem: driveway area × that layer's depth, converted to cubic yards, then to tons using that layer's material density. The base and top are summed for totals, and the formula line shows both computations.

Worked example — a 20×40 ft two-car driveway: 800 ft² with a 4-inch crusher-run base and 3-inch #57 top. Base: 800 × ⅓ ft = 267 ft³ = 9.9 yd³ ≈ 15.8 tons. Top: 800 × ¼ ft = 200 ft³ = 7.4 yd³ ≈ 10.0 tons. Total ≈ 25.8 tons — call it 27–28 with the standard 5–10% compaction buffer.

Why layers beat one thick fill: a single deep layer of mixed gravel ruts and migrates under traffic. The compacted base carries loads; the clean top drains and finishes. Skipping the separation is the most common — and most expensive — driveway shortcut.

How deep should each layer be?

Typical driveway layer depths by use
Driveway use Base layer Top layer
Light cars only 4" crusher run 2–3" #57 or #67
Cars + occasional trucks 5–6" crusher run 3" #57
Heavy vehicles / soft ground 6–8" (consider #2–3 stone under the base) 3" #57
Resurface only (existing solid base) 0" — skip 2–3" #57

On soft clay or poorly draining ground, geotextile fabric under the base prevents the stone from sinking into the soil over time — cheap insurance compared to redoing the drive. See the gravel types and sizes guide, or browse every calculator on the hub for what each grading code means.

Longer runs: private roads and lanes

A private road is this same two-layer build, scaled up — and at road length, rounding errors become whole truckloads, so measure carefully and compute each layer separately with the calculator above.

Two road-specific points matter more than stone choice:

  • Crown. Shape the finished surface so the center stands 2–4 inches above the edges — water must shed to the sides, never sit on the road. Standing water softens the base and forms potholes faster than anything else.
  • Maintenance. Gravel roads need periodic re-grading to restore the crown and refresh the surface — many owners keep a small stockpile of top stone. Every 5–10 years expect a fuller regrade.

Worked example — a quarter-mile lane, 10 ft wide: base: 13,200 ft² × 0.5 ft = 244 yd³ of crusher run ≈ 392 tons; surface: 13,200 × 0.167 ft = 81 yd³ of #67 ≈ 111 tons. Around 500 tons total before the compaction buffer — budget it deliberately.

What's the best road surface stone? A dense-graded angular base (crusher run or a state-approved road base) for structure, topped with cleaner stone that drains and can be graded. Round river rock belongs nowhere in a road — it ruts and rolls like marbles under tires.

Paver Base Calculator

Compacted base for paver patios and walkways — a shallower version of the same idea.

Crushed Gravel Calculator

Single-area quantities for crusher run and graded stone.

Gravel Cost Calculator

Price both layers at your supplier's rates.

Gravel Driveway Guide

Layers, depths, materials, and maintenance, start to finish.

Gravel Walkway Calculator

Paths use the same materials at narrower widths.

Cubic Yards to Tons Calculator

Plain tonnage for any area, with the yards-to-tons density table.

Driveway FAQ

How much gravel do I need for a 2-car driveway?

A typical 20×40 foot two-car driveway (800 sq ft) built properly needs roughly 15–22 cubic yards of gravel depending on layer depths: a 4–6 inch compacted base plus a 2–3 inch top. In tons that's roughly 22–34. Use the calculator above with your actual dimensions for a real number.

Why does a driveway need two layers of gravel?

The base layer (4–6 inches of crusher run or similar dense-graded stone) carries the load and compacts into a stable platform. The top layer (2–3 inches of clean stone like #57) provides the finish surface and drains. One thick layer of mixed material ruts, migrates, and fails faster than the same gravel split into two purpose-built layers.

What's the best gravel for a driveway base?

Crusher run (also called crush and run or dense-graded base) — angular crushed stone with fines that lock together under compaction. For the surface, clean angular stone like #57 or #67 is common. Avoid pea gravel for any driven surface: it's round, rolls under tires, and won't compact.

How much extra gravel should I order?

5–10% over the calculated amount is standard practice, because bases compact by 10–15% and edges always need touch-up material. Many suppliers also deliver in rounded load sizes, so a small buffer usually costs little extra.