Gravel Driveway Calculator
Calculate the cubic yards of gravel needed to surface a driveway at a specified depth. Use it before ordering bulk delivery for new driveway construction or replenishing an existing gravel surface.
Last updated: May 2026
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About this calculator
The formula is: gravelYards = (length × width × (depth/12)) / 27, where length and width are in feet, depth in inches, /12 converts inches to feet, and /27 converts cubic feet to cubic yards. Standard driveway depths: 4–6 inches for the initial gravel base on a new driveway (over compacted subgrade and geotextile fabric); 2–3 inches for top-dressing existing gravel; 1–2 inches for refreshing a well-established surface that has scattered slightly. New gravel driveways typically use a layered approach: 4 inches of base course (larger crushed stone, #2 or #3 size) on compacted subgrade with geotextile fabric beneath; 2 inches of intermediate (#57 or 3/4" minus crushed stone); 1–2 inches of surface course (typically #8 limestone screenings or "crusher run" with fines that bind and shed water). Total depth 6–8 inches new construction. Edge cases: zero values produce zero output; very wide or long driveways may exceed delivery truck capacity (typical dump truck 10 cu yd; semi-trucks 20–25 cu yd). One cubic yard of crushed stone weighs ~2,700 lbs (vs ~1,400 lbs for mulch); plan delivery access for heavy loads — full-size dump trucks need 12 ft width and 25 ft turning radius. Pricing: $15–$50/cubic yard for basic crushed stone or pea gravel delivered locally; $40–$100/cubic yard for decorative gravels (river rock, marble chips, pea gravel washed); plus $50–$200 delivery fee. One cubic yard covers: 162 sq ft at 2"; 108 sq ft at 3"; 81 sq ft at 4". Driveway material types: crusher run (mixed sizes 3/4" minus down to dust — best for driveways, binds well, sheds water); pea gravel (round 3/8" — easier on bare feet, scatters easily, not great for slopes); river rock (decorative, 1–3" rounded — doesn't compact, decorative-only); 3/4" minus limestone or granite (workhorse driveway material in most regions); recycled concrete or asphalt (cheap, available where mining yards exist).
How to use
Example 1 — New driveway installation. 80 ft long × 12 ft wide single-car driveway, 6 inches deep new construction. Enter length 80, width 12, depth 6. Result: (80 × 12 × (6/12)) / 27 = (960 × 0.5) / 27 = 480 / 27 ≈ 17.78 cubic yards. ✓ Order 20 yards to account for compaction (gravel compacts 15–25% as it's rolled and driven on). For layered construction: 13 yards of base (4 inches), 7 yards of surface (2 inches). Two dump truck deliveries needed (10 yd capacity each); arrange for clear staging or have the driver dump along the driveway centerline for easy spreading. Example 2 — Resurface existing driveway. 100 ft × 15 ft existing gravel driveway needing 2-inch refresh after several years of erosion. Enter length 100, width 15, depth 2. Result: (100 × 15 × (2/12)) / 27 = (1500 × 0.167) / 27 ≈ 9.26 cubic yards. ✓ Order 10 yards of crusher run for the refresh. Apply only after raking out the existing surface to break up matted areas; the new gravel binds with the broken-up base. Roll or drive over the new layer to compact; expect 10–15% settling in the first month of use.
Frequently asked questions
What kind of gravel is best for a driveway?
Depends on climate, slope, and use. "Crusher run" or "ABC gravel" (Aggregate Base Course — crushed stone with fines from 3/4" down to dust): the workhorse driveway material in most regions. The fines bind together when compacted, creating a hard relatively impermeable surface that sheds water and resists rutting. Best for the surface layer. "3/4" minus" or "#57 stone" (crushed limestone or granite, 3/4" to dust without the fine fraction): good base course material, doesn't bind as well as crusher run on its own. Pea gravel (round 3/8" pebbles): pleasant aesthetic, walks well, but scatters easily into adjacent areas, does not compact, washes out on slopes. Best for low-traffic walkways and decorative applications, not main driveways. River rock (1–3" rounded stones): purely decorative; cars sink in and rocks shoot under tires. Recycled concrete or asphalt: cheap, durable, ugly. Climate factors: cold-winter regions benefit from limestone over granite (granite freezes harder and can be slippery); wet climates need good drainage with proper crown and edge drainage; very dry climates benefit from larger fines content to reduce dust. Always order with a small percentage of fines (crusher run or 3/4" minus) for binding; pure clean stone without fines scatters and doesn't compact.
How thick should a gravel driveway be?
Total depth 6–8 inches for a new properly-constructed driveway, applied in layers. Subgrade preparation: excavate 6–8 inches below finished grade, compact the bottom; install geotextile fabric (woven landscape fabric) over the compacted subgrade to prevent gravel from sinking into soil and to prevent weeds from emerging through. Base course: 4 inches of #2 or #3 size crushed stone (1–2" pieces); compact thoroughly with a plate compactor or vibratory roller. Intermediate course: 2 inches of #57 stone (3/4" minus); compact. Surface course: 2 inches of crusher run or screenings (fines bind to surface); compact heavily. Driveways less than 4 inches total deep tend to rut and rapidly fail; 8+ inches is excessive for residential use unless very poor subgrade (heavy clay, frequent heavy truck access). Re-grading typically removes top 1–2 inches over time; adding 2 inches of fresh material annually (or biannually) maintains the surface. For high-traffic or commercial driveways, 8–10 inches base + 2 inches surface is typical, and sometimes a geogrid stabilization layer in addition to fabric.
How do I prevent a gravel driveway from washing out?
Several techniques compound for best results. 1) Proper crown: driveway should slope from center to both edges at 1–2% (about 1 inch fall per 8 ft width) so water sheds sideways rather than running along the length. 2) Edge drains and swales: install a shallow ditch on the uphill side of sloped driveways to intercept runoff; pipe under the driveway to release on the downhill side. Without this, water flows along the driveway surface, picking up gravel as it goes. 3) Cross slope on long driveways: don't let water run the full length; install cross-drains (culverts or "Vermont waterbars" — angled rolled berms across the driveway) every 50–100 ft on slopes. 4) Geotextile fabric beneath gravel: prevents gravel from sinking into mud after rain, maintaining the structural layer. 5) Proper compaction during installation: loose gravel washes 5–10× faster than compacted gravel. 6) Avoid steep grades; driveways above 12% slope are difficult to keep stable with gravel — consider asphalt or concrete instead. 7) Maintenance grading: rake gravel back from edges to centerline twice yearly to reverse erosion. 8) Stabilization grids (TruGrid, GravelPave): plastic honeycomb structures laid over gravel that hold individual stones in place; effective on slopes and high-traffic areas where conventional gravel washes out.
What are the most common gravel driveway mistakes?
The biggest is skipping geotextile fabric beneath the gravel; without fabric, gravel sinks into soft soil within months, becoming a muddy mess. Always install fabric. The second is using pea gravel or river rock for the surface course; these don't compact and scatter under tires within weeks. Use crusher run for the surface. The third is ordering and installing in one batch without compacting layers; pile-and-spread without compaction produces a fluffy unstable surface that ruts at first heavy rain. Compact each layer. The fourth is going too thin — 2 inches of gravel over soil is essentially a dusting that disappears in the first season. Use at least 4 inches for a passable driveway, 6–8 inches for proper construction. The fifth is grading flat without a crown; flat driveways pond water that erodes the surface and softens the subgrade. Always crown 1–2%. The sixth is using gravel on steep grades (>12% slope) where it perpetually washes out; consider gravel grids, asphalt, or concrete for steep applications. The seventh is forgetting edge containment — without bordering (cobblestones, treated lumber, steel edging, paver blocks), gravel migrates outward into lawn and beds; install edging at design phase. The eighth is using free or recycled materials of unknown composition (sometimes contains rebar, broken concrete that doesn't compact, or other debris); pay for quality crushed stone from a known supplier. The ninth is failing to maintain — annual raking and biannual top-dressing keep a driveway in good shape; neglected gravel driveways fail in 5–10 years vs maintained ones lasting 20+.
When should I not use gravel for a driveway?
Skip it for very steep driveways (>15% slope) where gravel will perpetually wash out; use asphalt, concrete, or pavers instead. It is the wrong tool for high-traffic commercial or industrial applications with frequent heavy vehicle use where the surface compacts and ruts under load; concrete or asphalt handle these loads better. Do not use it in arid/dusty climates without dust suppression considerations; gravel driveways produce significant dust that coats nearby plantings and infiltrates indoor spaces. For HOA neighborhoods or communities with strict aesthetic standards, gravel may not be permitted; check covenants before installation. In snow-belt regions, gravel driveways are difficult to plow without picking up gravel and damaging the plow; consider concrete or asphalt or accept manual snow removal with a shovel. For accessibility requirements (wheelchairs, walkers, strollers), gravel is unsuitable; smoother surfaces are required. For very long driveways (>500 ft) requiring substantial gravel volume, the upfront cost approaches asphalt cost while providing inferior long-term performance; do the lifecycle math. For rental properties with high tenant turnover, gravel requires more maintenance than tenants typically provide; pavement may be more practical despite higher install cost. And for environmental restoration or low-impact development projects, permeable pavers or vegetated grass-pavers may align better with stormwater management goals than impermeable-bound gravel.