Guide · Gravel
How Much Gravel Do I Need for a Driveway?
A typical two-car driveway — 12 feet wide by 50 feet long — at 4 inches of compacted depth needs about 7.4 cubic yards of gravel, or roughly 10.4 tons. Add 10% for compaction and uneven subgrade and order about 8.2 yards (around 11.4 tons).
The exact math is below, with a chart for common driveway sizes, how deep to build, which gravel type to buy, and how to order. Or enter your dimensions in our free driveway gravel calculator — it returns cubic yards and tons, with waste built in.
Cubic yards and tons for your exact driveway — free, no sign-up.
Open the gravel calculator →For 12×50 ft at 4″ deep, before waste. With 10%: 8.2 yd³ (~11.4 tons).
The math, step by step
= 12 ft × 50 ft × (4 ÷ 12) ft = 200 ft³
Cubic yards = 200 ÷ 27 = 7.41 yd³
Tons = 7.41 × 1.4 = 10.4 tons
- Convert depth to feet. 4 inches ÷ 12 = 0.333 ft.
- Multiply. 12 × 50 × 0.333 = 200 cubic feet.
- Convert to cubic yards. 200 ÷ 27 = 7.41 yd³.
- Convert to tons. Crushed gravel runs about 1.4 tons per yard: 7.41 × 1.4 = 10.4 tons.
- Add waste. Compaction and an uneven subgrade eat 10–15%: 7.41 × 1.10 = 8.15 → order 8.2 cubic yards (about 11.4 tons).
Gravel needed for common driveway sizes
Volumes are compacted depth — add 10–15% when ordering. Tons use the 1.4 tons-per-yard planning figure; confirm your supplier’s conversion.
| Driveway | At 3″ deep | At 4″ deep |
|---|---|---|
| 10×30 ft | 2.78 yd³ · 3.9 t | 3.7 yd³ · 5.2 t |
| 12×40 ft | 4.44 yd³ · 6.2 t | 5.93 yd³ · 8.3 t |
| 12×50 ft | 5.56 yd³ · 7.8 t | 7.41 yd³ · 10.4 t |
| 14×60 ft | 7.78 yd³ · 10.9 t | 10.37 yd³ · 14.5 t |
| 16×60 ft | 8.89 yd³ · 12.4 t | 11.85 yd³ · 16.6 t |
Most residential driveways want 3–4 inches of compacted surface. Heavy vehicles and soft soils call for 6+ inches — see below.
How deep should a gravel driveway be?
Plan on 3–4 inches of compacted gravel for a typical residential driveway. Soft or clay soils, heavy trucks, and RV parking push that to 6 inches or more. Install deep driveways in lifts — spread and compact 2–3 inches at a time rather than dumping 6 inches at once, because a thick loose layer never compacts evenly. Note that 6 inches loose compacts to roughly 4–5 inches, which is part of why the 10–15% ordering allowance matters.
Build it in layers: base, then surface
The best gravel driveways are two materials, not one. Start with a base layer of large crushed stone (2–3-inch crusher run or road base), 4–6 inches deep, compacted hard — this is the structural layer that spreads vehicle loads. Top it with 3–4 inches of smaller angular gravel (¾-inch crusher run / 21AA) that locks together under tires and gives a smooth driving surface. The classic mistake is a single thick layer of one size, which ruts and migrates. On soft or clay subgrade, lay geotextile fabric under the base so the stone doesn’t sink into the mud over the first wet season.
What type of gravel is best for a driveway?
Choose crushed, angular stone — often sold as “crusher run,” “road base,” or “21AA” — with a mix of sizes including fines (stone dust). The angular faces and fines interlock and compact into a firm surface. Round stone like pea gravel looks nice but migrates: tires push it aside, and you’ll be raking it back into the driveway monthly. Decomposed granite packs beautifully but can get dusty and soft when saturated. Whatever you choose, ask the quarry for a driveway or road-base blend — they sell it every day and know what compacts in your soil.
Crown, drainage, and ordering
Grade the driveway with a slight crown — the center about 2% (roughly ¼ inch per foot) higher than the edges — so water sheets off instead of pooling and carving ruts. Ditches or swales along the sides carry that water away. When ordering, match the supplier’s unit: quarries often sell by the ton, landscape yards by the yard. A tri-axle dump truck carries roughly 18–22 tons, so our example 11.4-ton order is a single partial load — confirm the delivery fee for short loads. For the weight and coverage of a single yard, see our companion guide on how much a yard of gravel weighs and covers.
Maintaining a gravel driveway
A gravel driveway isn’t install-and-forget — but maintenance is cheap and simple. Grade it once or twice a year with a landscape rake or box blade to pull migrated stone back into ruts and restore the crown; spring grading after the thaw fixes most winter damage. Fill potholes promptly by loosening the edges, adding fresh stone, and tamping — a small pothole becomes a big one fast under tires. Plan a top-up load every 1–3 years: an inch of fresh surface stone every couple of years keeps the driveway looking new for a fraction of the original cost. In snow country, set plow shoes or use a rubber edge so the blade doesn’t peel the surface off; expect to rake the shoulders back into the driveway each spring. Dust in dry climates can be tamed with calcium chloride flakes or simply by choosing a crusher-run blend with good fines.
How we calculate
Gravel volume is length × width × depth (in feet), converted at 27 ft³ per cubic yard. Tons use a 1.4 tons-per-yard planning figure for crushed stone — confirm your supplier’s conversion, since stone type and moisture move it. Depths are compacted depths; the 10–15% ordering allowance covers compaction loss and subgrade irregularity. Depth, layering, and fabric guidance is general practice; soft soils, heavy loads, and HOA or municipal rules may require a different section — when in doubt, ask your quarry or a local contractor.
Reviewed September 2026 · TrueMeasure
Frequently asked questions
How deep should a gravel driveway be?
3–4 inches compacted for typical residential use; 6+ inches for heavy vehicles or soft soils. Build deep sections in 2–3-inch lifts, compacting each.
Is gravel sold by the ton or the yard?
Both — quarries usually sell by the ton, landscape yards by the yard. Convert at about 1.4 tons per cubic yard, but use your supplier’s figure when ordering.
What type of gravel is best for driveways?
Crushed angular stone with fines (crusher run / road base / 21AA) — it interlocks and compacts. Round pea gravel migrates under tires and needs constant raking.
Should I put landscape fabric under a gravel driveway?
Yes on soft or clay soils: geotextile fabric keeps the stone from sinking into the mud. On firm, well-draining subgrade it’s optional.
How much extra gravel should I order?
10–15% over the compacted-depth calculation. Compaction alone consumes several percent, and no subgrade is perfectly even.
How often does a gravel driveway need more stone?
Typically a top-up every 1–3 years depending on traffic, plowing, and drainage — plus regrading after heavy rains. Good drainage stretches the interval.