How many cubic yards of gravel for a 12x40 driveway?

12 × 40 ft = 480 sq ft. At 4 inches deep: 480 × 4 ÷ 324 = 5.93 cubic yards plus 15% compaction = 6.82 cubic yards. At 6 inches deep: 8.89 cubic yards plus 15% = 10.22 cubic yards. For a complete two-layer driveway: base layer at 4 inches (6.82 yd³) plus surface at 2 inches (1.83 yd³) = approximately 8.65 cubic yards total.

How often does a gravel driveway need to be topped up?

Most residential gravel driveways need 1 to 2 inches of fresh surface material every 2 to 3 years. Driveways with heavy vehicle traffic or in high-rainfall areas may need annual topping. Signs that a top-up is needed: potholes developing, gravel migrating to edges, bare patches of subsoil showing, surface becoming uneven. Calculate the top-up quantity: Length × Width × 1 to 2 inches ÷ 324 = cubic yards. A 10 × 40 ft driveway at 1-inch top-up = 1.23 cubic yards.

Gravel Driveway Calculator — Tons, Yards & Cost 2026

Q: How much gravel do I need for a driveway?

For a new gravel driveway, calculate base and surface layers separately. Base layer (#3 crushed stone or crusher run): Length × Width × Base depth (in) ÷ 324 = Cubic yards. Surface layer (#57 stone or pea gravel): Length × Width × Surface depth (in) ÷ 324 = Cubic yards. Standard residential driveway: 4 to 6 inches base plus 2 to 3 inches surface. A single-car driveway 10 × 40 ft needs approximately 5.4 cubic yards base and 2.5 cubic yards surface — about 7.9 cubic yards total plus a 15 percent compaction buffer.

Q: How deep should a gravel driveway be?

New residential driveway on firm soil: 4 inches compacted base plus 2 inches surface = 6 inches total minimum. New driveway on soft or clay soil: 6 inches base plus 3 inches surface = 9 inches total. Driveway for heavy vehicles (trucks, RVs): 6 to 8 inches base plus 2 to 3 inches surface = 8 to 11 inches total. Resurfacing an existing driveway: 2 to 3 inches of fresh surface material only — no base layer needed unless the existing base has failed.

Q: What is the best gravel for a driveway?

Use different gravel for each layer. Base layer: #3 crushed stone (1 to 2 inches) or crusher run. Both are angular and compact into a solid structural foundation. Middle/binding layer: #57 crushed stone (3/4 inch). Angular, interlocks under compaction, most common driveway gravel. Surface layer: #8 stone (3/8 inch) for a firm surface or pea gravel for a softer appearance. Never use pea gravel as the only driveway material — rounded stones shift and rut under vehicle weight within the first season.

Q: How many tons of gravel for a driveway?

Multiply cubic yards by material density. #57 crushed stone at 1.4 tons per cubic yard: a 12 × 40 ft driveway at 4 inches needs 6.82 yd³ × 1.4 = 9.55 tons. Crusher run at 1.45 t/yd³: 6.82 × 1.45 = 9.89 tons. Pea gravel surface at 1.35 t/yd³: 1.83 yd³ × 1.35 = 2.47 tons. Total project: approximately 10 to 12 tons depending on layer materials chosen.

Q: How much does a gravel driveway cost?

Materials only: $0.50 to $1.50 per square foot for single-layer gravel. Full installation (excavation, base, surface, compaction): $1.00 to $3.00 per square foot. A standard single-car driveway 10 × 40 ft = 400 sq ft: materials $200 to $600, full installation $400 to $1,200. A two-car driveway 20 × 40 ft = 800 sq ft: materials $400 to $1,200, full installation $800 to $2,400. DIY saves 40 to 60 percent of total cost by eliminating labor. Gravel cost varies significantly by region — the Southeast is cheapest, the Pacific Coast most expensive.

Q: How much gravel for a single-car driveway?

A standard single-car driveway 10 × 20 ft at 4 inches: 2.72 cubic yards plus 15% = 3.13 cubic yards, approximately 4.4 tons of crushed stone. For a longer 10 × 40 ft driveway at 4 inches: 5.43 cubic yards plus 15% = 6.24 cubic yards, approximately 8.7 tons. A complete two-layer installation (4-inch base plus 2-inch surface): add another 1.52 cubic yards for the surface layer on a 10 × 40 ft driveway.

Q: How much gravel for a two-car driveway?

Standard two-car driveway 20 × 20 ft at 4 inches: 5.43 cubic yards plus 15% = 6.24 cubic yards, approximately 8.7 tons. For 20 × 40 ft at 4 inches: 10.86 cubic yards plus 15% = 12.49 cubic yards, approximately 17.5 tons. A complete two-layer installation (4-inch base plus 2-inch surface): add 3.05 cubic yards for the surface layer. Total for 20 × 40 ft two-layer driveway: approximately 15.5 cubic yards or 22 tons of combined materials.

Q: What is crusher run and when should I use it?

Crusher run (also called road base, dense-grade aggregate, or DGA) is a blend of crushed stone and stone dust in mixed sizes from 1.5 inches down to fine particles. It is the best base material for driveways because the mixed particle sizes compact together into a near-solid layer — unlike single-size gravel which has void spaces. Crusher run compacts 25 to 35 percent. For soft or clay subgrade, use 6 inches of compacted crusher run before adding any surface gravel. It costs $15 to $30 per ton — the cheapest of all driveway gravels.

Q: Can a gravel driveway be too steep?

Yes. Loose gravel starts migrating on slopes above 12 percent grade (approximately 7 degrees or a 1.2-foot rise per 10 feet). Above 15 percent, gravel will wash and shift rapidly with any rain. For slopes above 10 percent, use angular crusher run or #57 stone — never pea gravel or river rock which migrate on any noticeable slope. Install water bars (drainage channels across the driveway) every 100 feet on sloped driveways to divert runoff. Steeper slopes may require a paved surface or concrete grid pavers filled with gravel.

✓

Density values from USGS aggregate data · Layer specification per civil engineering driveway standards · Compaction factors from ASTM D698 subgrade compaction practice · Methodology · Updated June 2026

Gravel Driveway Calculator

This calculator computes base and surface layers separately — the only way to order the right gravel types and quantities for each layer.

Driveway Length (feet)

Driveway Width (feet)

Layer 1 Base Layer — Structural Foundation

Base Depth (inches)

Custom Base Depth (in)

Base Material

Compaction Factor

Layer 2 Surface Layer — Driving Surface

Surface Depth (inches)

Custom Surface Depth (in)

Surface Material

Compaction Factor

Price estimate (optional)

Please enter valid driveway dimensions greater than zero.

BASE LAYER:

—

Cubic yards

—

Tons

—

Est. cost

SURFACE LAYER:

—

Cubic yards

—

Tons

—

Est. cost

COMBINED TOTAL:

—

Total cubic yards

—

Total tons

Results include compaction buffers for each layer. Compaction factors differ by material — crusher run compacts more than surface gravel. Always order the buffered amounts shown.

Quick Answer: New driveway formula: Length × Width × Depth (in) ÷ 324 = Cubic yards per layer. Standard residential: 6 inches crusher run base + 2 inches #57 surface. Add 25–30% for base compaction. Base and surface are different materials — always calculate and order separately.

In This Guide

Formula — how to calculate driveway gravel
3-layer driveway specification
Depth guide by vehicle class and soil type
Gravel types for driveways
Compaction factors by material
Pre-calculated quantities — common driveway sizes
Slope limits for gravel driveways
Gravel driveway cost 2026
Driveway top-up calculator
Frequently asked questions

Formula — How to Calculate Driveway Gravel

A gravel driveway requires calculating each layer separately because the base and surface use different materials with different densities and different compaction rates. A calculator that gives a single combined figure is only useful if you plan to use the same gravel throughout — which produces a poor-quality driveway.

Per-layer formula: Length (ft) × Width (ft) × Depth (in) ÷ 324 = Raw cubic yards
Raw cubic yards × Compaction factor = Cubic yards to order
Cubic yards to order × Density = Tons to order

Worked example — 12 × 40 ft driveway, new construction:

Area = 480 sq ft. Base layer: 6 inches of crusher run. Raw = 480 × 6 ÷ 324 = 8.89 yd³. With 30% compaction = 11.56 yd³. Tons = 11.56 × 1.45 = 16.76 tons. Surface layer: 2 inches of #57 stone. Raw = 480 × 2 ÷ 324 = 2.96 yd³. With 15% compaction = 3.40 yd³. Tons = 3.40 × 1.40 = 4.77 tons. Total: 14.96 yd³ and 21.53 tons of combined materials.

3-Layer Driveway Specification

A properly constructed gravel driveway has three distinct layers. Each layer serves a different function. Skipping any layer reduces the driveway lifespan by years.

Layer	Material	Depth	Function
Base (Layer 1)	#3 crushed stone or crusher run	4–6 inches compacted	Structural support — distributes vehicle weight into subgrade
Middle / binding (Layer 2)	#57 crushed stone (3/4 in)	2–3 inches compacted	Transition layer — interlocks base and surface, improves stability
Surface (Layer 3)	#8 stone or pea gravel	2 inches	Driving surface — appearance, comfort underfoot and under tyre

In practice, many residential driveways use just two layers: a crusher run base and a #57 or pea gravel surface. This is acceptable for light vehicle use on firm, well-drained soil. The three-layer specification is recommended for: heavy vehicles, soft or clay-heavy subgrade, high rainfall areas, driveways on slopes, or any project intended to last 10 years or more without major regrading.

Depth Guide by Vehicle Class and Soil Type

Situation	Base depth	Surface depth	Total
Passenger cars only — firm sandy soil	4 inches	2 inches	6 inches
Passenger cars only — mixed soil	5–6 inches	2 inches	7–8 inches
Standard residential — any soil	6 inches	2 inches	8 inches
SUVs and light trucks	6 inches	2–3 inches	8–9 inches
Heavy vehicles (delivery, RV)	8 inches	2–3 inches	10–11 inches
Clay or soft subgrade — any vehicle	8 inches	2–3 inches	10–11 inches
Resurfacing existing driveway	None (existing base)	2–3 inches	2–3 inches

Clay soil requires extra base depth because clay is plastic when wet — it deforms under load. On clay, the base layer must be thick enough to distribute the vehicle weight over a large enough area that the clay beneath never reaches its bearing limit. A 4-inch base on clay will result in base failure within the first wet season. Geotextile fabric between the subgrade and base layer is also recommended on clay — it prevents the base from mixing into the clay over time.

Gravel Types for Driveways

Material	Size	Density	Layer	Cost per ton
Crusher run / road base	Mixed — 1.5 in down to dust	1.45 t/yd³	Base only	$15–$30
#3 crushed stone	1–2 inches	1.35 t/yd³	Base	$25–$45
#57 crushed stone	3/4 inch	1.40 t/yd³	Middle / Surface	$28–$45
#8 stone	3/8 inch	1.40 t/yd³	Surface	$30–$50
Pea gravel	3/8–5/8 inch	1.35 t/yd³	Surface only	$30–$55
Crushed limestone	3/4 inch	1.40 t/yd³	Base or Surface	$20–$35

Crusher run is the best value base material. Its mixed particle sizes — from 1.5 inches down to stone dust — compact together into a near-solid layer that provides maximum structural strength. It costs less than single-size gravel because it is an unprocessed byproduct of the crushing process. The stone dust component is what makes it compact so effectively — clean single-size gravel has void spaces between particles that reduce load distribution.

Pea gravel is a legitimate surface material for residential driveways used by passenger vehicles only. Its rounded shape makes it comfortable to walk on and visually appealing. It is not a base material — it cannot be compacted and provides no structural support. See the pea gravel driveway guide for the full specification including slope limits and edging requirements.

Compaction Factors by Material

Gravel delivered loose by a dump truck occupies more volume than it will after compaction by machinery, vehicle traffic, and rainfall. The compaction factor accounts for this volume reduction. Ordering without a compaction buffer results in a finished driveway that is shallower than specified.

Material	Compaction rate	Order factor	Why
Crusher run / DGA	25–35%	×1.30	Mixed fines compact aggressively
#3 crushed stone	20–25%	×1.22	Large angular stones settle significantly
#57 crushed stone	15–20%	×1.17	Medium angular stone, moderate compaction
#8 stone	10–15%	×1.12	Fine angular stone, less void space
Pea gravel	10–12%	×1.10	Rounded — minimal true compaction, some settling
Crushed limestone	15–20%	×1.17	Similar to #57 stone

Pre-Calculated Quantities — Common Driveway Sizes

Base: 6 inches crusher run at 1.45 t/yd³ with 30% compaction. Surface: 2 inches #57 stone at 1.40 t/yd³ with 15% compaction.

Driveway size	Sq ft	Base (yd³ / tons)	Surface (yd³ / tons)	Total
Single car 10 × 20 ft	200	4.81 yd³ / 6.97 t	1.42 yd³ / 1.98 t	6.23 yd³ / 8.95 t
Single car 10 × 40 ft	400	9.63 yd³ / 13.96 t	2.84 yd³ / 3.98 t	12.47 yd³ / 17.94 t
Standard 12 × 40 ft	480	11.56 yd³ / 16.76 t	3.41 yd³ / 4.77 t	14.97 yd³ / 21.53 t
Two car 20 × 20 ft	400	9.63 yd³ / 13.96 t	2.84 yd³ / 3.98 t	12.47 yd³ / 17.94 t
Two car 20 × 40 ft	800	19.26 yd³ / 27.92 t	5.68 yd³ / 7.95 t	24.94 yd³ / 35.87 t
Long driveway 12 × 100 ft	1,200	28.89 yd³ / 41.89 t	8.52 yd³ / 11.93 t	37.41 yd³ / 53.82 t

Slope Limits for Gravel Driveways

Slope is the variable that determines whether a gravel driveway is viable at all — and which gravel type to use if it is.

Slope	Grade	Gravel suitability	Recommended material
0–5%	Up to 3°	Ideal — any gravel type	Any — pea gravel acceptable
5–10%	3–6°	Good — avoid rounded stone	#57 or crusher run only
10–12%	6–7°	Marginal — angular stone required	Crusher run or #3 — no surface gravel
12–15%	7–8.5°	Problematic — consider alternatives	Crusher run only + water bars
Above 15%	Over 8.5°	Not recommended for loose gravel	Concrete, asphalt, or grid pavers

On slopes above 10 percent, install water bars — shallow drainage channels cut diagonally across the driveway — every 50 to 100 feet. Without water bars, rainfall channels down the slope of the driveway and washes gravel from the surface. This is the primary maintenance problem for sloped gravel driveways and is completely preventable with proper drainage design.

Gravel Driveway Cost 2026

Cost item	DIY	Professional installation
Excavation and grading	$0 (rented equipment $150–$400/day)	$0.50–$1.00 per sq ft
Geotextile fabric (recommended)	$0.15–$0.30 per sq ft	$0.20–$0.40 per sq ft installed
Base layer (crusher run)	$15–$30 per ton delivered	$20–$40 per ton delivered and spread
Surface layer (#57 or pea gravel)	$28–$55 per ton delivered	$35–$65 per ton delivered and spread
Compaction (rented plate compactor)	$60–$120 per day rental	Included in labor
Edging (steel or plastic)	$0.50–$2.00 per linear foot	$1.50–$4.00 per linear foot installed
Total per sq ft	$0.50–$1.50	$1.00–$3.00

DIY installation saves 40 to 60 percent of total project cost. The tasks that require equipment — excavation, grading, and compaction — can all be handled with rented machinery. The main challenge is compaction: a hand tamper is not adequate for driveway base compaction above 2 inches deep. A rented plate compactor ($60 to $120 per day) is required to compact crusher run properly in 2-inch lifts.

Driveway Top-Up Calculator

Existing gravel driveways typically need 1 to 2 inches of fresh surface material every 2 to 3 years. To calculate the top-up quantity:

Length × Width × Top-up depth (in) ÷ 324 = Cubic yards needed
Add 10% for edge coverage and spillage. No compaction buffer needed for surface top-ups.

Driveway size	At 1 inch top-up	At 2 inches top-up
10 × 40 ft (400 sq ft)	1.36 yd³ / 1.90 t	2.72 yd³ / 3.81 t
12 × 40 ft (480 sq ft)	1.63 yd³ / 2.28 t	3.26 yd³ / 4.57 t
20 × 40 ft (800 sq ft)	2.72 yd³ / 3.81 t	5.43 yd³ / 7.60 t

Frequently Asked Questions

How much gravel do I need for a driveway?

Calculate base and surface layers separately. Formula: Length × Width × Depth (in) ÷ 324 = raw cubic yards. Add 25–30% for base compaction, 10–15% for surface. A 12 × 40 ft driveway at 6-inch base + 2-inch surface needs approximately 15 cubic yards total.

How deep should a gravel driveway be?

Standard residential: 6 inches compacted base plus 2 inches surface = 8 inches total. Soft or clay subgrade: 8 inches base plus 2–3 inches surface = 10–11 inches. Heavy vehicles (trucks, RVs): 8 inches base plus 3 inches surface. Resurfacing only: 2–3 inches of fresh surface material.

What is the best gravel for a driveway?

Base: crusher run or #3 crushed stone — angular, compacts solid. Middle/surface: #57 crushed stone (3/4 inch) — most common driveway gravel, interlocks. Surface finish: #8 stone or pea gravel. Never pea gravel as the only material — it shifts and ruts under vehicle weight.

How many cubic yards for a 12x40 driveway?

At 4 inches: 6.82 yd³. At 6 inches: 10.22 yd³ (base layer). Plus 2-inch surface: additional 1.83 yd³. Full two-layer total: approximately 12 cubic yards. See the pre-calculated table above for more sizes.

How many tons of gravel for a driveway?

Multiply cubic yards by material density. #57 stone at 1.4 t/yd³: 12 yd³ × 1.4 = 16.8 tons. Crusher run at 1.45 t/yd³: 12 × 1.45 = 17.4 tons. A standard 12 × 40 ft two-layer driveway needs approximately 18–22 tons of combined materials.

How much does a gravel driveway cost?

Materials only: $0.50–$1.50 per sq ft. Full installation: $1.00–$3.00 per sq ft. Single-car driveway (10 × 40 ft): $200–$600 materials, $400–$1,200 installed. Two-car (20 × 40 ft): $400–$1,200 materials, $800–$2,400 installed. DIY saves 40–60% of total cost.

How much gravel for a single-car driveway?

10 × 40 ft at 6-inch base plus 2-inch surface: 12.47 cubic yards total / 17.94 tons. 10 × 20 ft at same depth: 6.23 cubic yards / 8.95 tons. Add separate surface layer material costs to your base layer order.

How much gravel for a two-car driveway?

20 × 40 ft at 6-inch base plus 2-inch surface: 24.94 cubic yards / 35.87 tons. 20 × 20 ft: 12.47 cubic yards / 17.94 tons. Order base and surface as separate deliveries — they should not be mixed.

What is crusher run and when should I use it?

Crusher run is mixed-size crushed stone from 1.5 inches down to stone dust. The mixed particle sizes compact into a near-solid layer — better base performance than single-size gravel. Cost $15–$30 per ton — cheapest driveway gravel. Compacts 25–35%. Best choice for driveway base on any soil type.

Can a gravel driveway be too steep?

Above 12 percent grade, loose gravel migrates. Above 15 percent, not recommended for loose gravel — consider concrete, asphalt, or grid pavers. For slopes 10–12 percent: use angular crusher run only, no surface pea gravel, install water bars every 50–100 ft to divert runoff.

How often does a gravel driveway need topping up?

Every 2–3 years for most residential driveways. High traffic or high rainfall: annually. Signs: potholes forming, bare subsoil showing, gravel migrating to edges. Top-up: 1–2 inches of fresh surface material. 12 × 40 ft at 1-inch top-up = 1.63 yd³ / 2.28 tons.

Do I need a base layer for a gravel driveway?

Yes for any new driveway on native soil. Without a compacted base, surface gravel sinks into the subsoil and the driveway ruts within one or two seasons. Exception: resurfacing an existing driveway with a solid, stable base — add fresh surface material only without disturbing the base.

Related Calculators and Guides

Calculator

Gravel Calculator

General gravel calculator for any project — 4 shapes, 10 materials, French drain and dump truck sections.

Guide

Pea Gravel Driveway Guide

Full pea gravel driveway specification — cost, depth, base spec, edging, slope limits, and snow removal.

Converter

Cubic Yards to Tons

Convert crusher run, #57 stone, and all gravel types — 20 materials, bidirectional, short tons and metric tonnes.

Calculator

Coverage Calculator

Pea gravel coverage by area and depth — cubic yards, tons, and bag count for any project size.

Converter

Square Feet to Cubic Yards

Convert driveway area and depth to cubic yards — rectangle, circle, and triangle shapes supported.

Guide

Gravel Sizes Guide

#3, #57, #8, crusher run explained — which size for which layer and which project.

Sources & Methodology

USGS — Natural Aggregates Statistics — bulk density reference data for construction aggregate materials
ASTM D698 — Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (compaction factor reference)

Density values: Crusher run 1.45 t/yd³. #57 stone 1.40 t/yd³. #3 stone 1.35 t/yd³. Pea gravel 1.35 t/yd³. Compaction factors represent typical field compaction with mechanical plate compactor. Hand compaction achieves lower compaction rates — increase buffer by 5 to 10 percent for hand-tamped projects. Full methodology

Last reviewed: June 2026