Gravel Calculator
Calculate cubic yards and tons of gravel, crushed stone, or aggregate for driveways, pathways, and landscaping projects.
Area
Depth & Material
⛰️
Enter area and depth
Results will appear here instantly
Complete Guide to Gravel: Types, Sizing, and Applications
Gravel is one of the most versatile and widely used construction and landscaping materials. From driveway construction to French drain systems, retaining wall backfill to decorative walkways, the right gravel makes the difference between a project that lasts decades and one that fails within a few years. Understanding the different types of gravel, their sizing numbers, weight conversions, compaction properties, and appropriate applications is essential for estimating the correct quantity and choosing the right material for your specific project. This guide covers everything from standard aggregate classifications to delivery logistics and cost considerations.
Types of Gravel and Their Uses
Gravel is classified by size number, material composition, and shape. Each type is designed for specific applications. Using the wrong gravel for a project can lead to drainage problems, poor compaction, shifting surfaces, or wasted money. The table below describes the most common gravel types available at landscape supply yards and quarries.
| Gravel Type | Size | Tons/yd³ | Cost/Ton | Best Applications |
|---|---|---|---|---|
| #57 Crushed Stone | 3/4" to 1" | 1.35 | $25 - $50 | Driveways, drainage, pipe bedding |
| #411 Crushed (process gravel) | 3/4" minus fines | 1.40 | $20 - $40 | Driveway base, under concrete slabs |
| Pea Gravel | 3/8" to 1/2" | 1.35 | $30 - $55 | Walkways, patios, dog runs, playgrounds |
| River Rock | 1" to 3" | 1.30 | $40 - $75 | Decorative beds, dry creek beds, erosion control |
| Crushed Limestone | Various sizes | 1.50 | $30 - $55 | Driveway surface, base layers, pH correction |
| Crushed Granite | 1/4" to 3/4" | 1.45 | $35 - $75 | Pathways, xeriscaping, under pavers |
| Marble Chips | 3/8" to 3/4" | 1.40 | $75 - $150 | Decorative landscaping, garden borders |
| Lava Rock | 3/4" to 2" | 0.50 - 0.65 | $50 - $100 | Lightweight decorative, fire pits, planters |
Understanding Tons vs. Cubic Yards
Gravel is sold either by the cubic yard (volume) or by the ton (weight), and the conversion between the two depends on the material's density. This is one of the most common sources of confusion when ordering gravel. A cubic yard is a volume measurement equal to 27 cubic feet, roughly the size of a standard washing machine on all sides. The weight of that cubic yard varies significantly depending on the type of stone, its moisture content, and how densely it is packed.
| Material | lbs/yd³ | Tons/yd³ | yd³/Ton |
|---|---|---|---|
| Standard gravel | 2,800 | 1.40 | 0.71 |
| Crushed stone | 2,700 | 1.35 | 0.74 |
| Pea gravel | 2,700 | 1.35 | 0.74 |
| Crushed limestone | 3,000 | 1.50 | 0.67 |
| Crushed granite | 2,900 | 1.45 | 0.69 |
| River rock | 2,600 | 1.30 | 0.77 |
| Lava rock | 1,000 - 1,300 | 0.50 - 0.65 | 1.54 - 2.00 |
Gravel Depth Requirements by Application
The required depth of gravel varies dramatically based on how the surface will be used. A decorative garden path needs far less material than a driveway that must support vehicles. Using too little gravel leads to bare spots, ruts, and poor drainage. Using too much wastes money without providing any additional benefit. The table below shows recommended depths for the most common gravel applications.
| Application | Recommended Depth | Gravel Type | Notes |
|---|---|---|---|
| Driveway (residential) | 4 - 6 inches | #411 base + #57 or #8 surface | Crown center 1-2" for drainage |
| Driveway (heavy traffic) | 6 - 8 inches | #3 base + #411 + surface layer | 3-layer system for durability |
| Walking path | 2 - 3 inches | Pea gravel or crushed granite | Use edging to contain material |
| Patio base (under pavers) | 4 - 6 inches | #411 or process gravel | Compact in 2" lifts |
| French drain | 12+ inches | #57 or #67 (clean, no fines) | Wrap pipe in filter fabric |
| Decorative landscape | 2 - 3 inches | River rock, marble chips, lava rock | Use fabric underneath to prevent weeds |
| Retaining wall backfill | 12+ inches behind wall | #57 clean stone | Critical for drainage and pressure relief |
Compaction Factors and Base Preparation
When gravel is used as a structural base for driveways, patios, or concrete slabs, proper compaction is critical. Loose gravel settles unevenly under load, creating dips, ruts, and cracks in the surface above. Compaction reduces the air voids between stones, creating a dense, stable layer that distributes weight evenly and resists displacement.
How Much Extra for Compaction?
Angular crushed stone (like #411 process gravel) compacts by approximately 20-25% when properly compacted with a plate compactor or roller. This means you need to order 20-25% more material than your calculated volume to achieve the desired finished depth. For example, if you need a 4-inch compacted base, spread approximately 5 inches of loose gravel before compacting. Rounded gravel like pea gravel compacts very little (5-10%) because the smooth stones do not interlock.
Compaction Best Practices
Always compact gravel in lifts (layers) no more than 2-3 inches thick. Spreading the full depth at once and trying to compact it results in only the top few inches becoming dense while the bottom remains loose. For driveways and structural applications, make at least 3-4 passes with a plate compactor over each lift, overlapping each pass by half the plate width. Lightly misting the gravel with water before compaction improves the result. If you are building a concrete slab over the gravel base, use our concrete calculator to estimate the concrete needed for the slab itself.
Gravel for Drainage: French Drains and Dry Wells
Clean gravel (stone with no fine particles or dust) is essential for drainage applications like French drains, curtain drains, and dry wells. The air spaces between the stones allow water to flow freely through the gravel bed and into a perforated pipe or collection area. Using gravel with fines in a drainage application will clog the system over time as the fine particles settle and block water flow.
For a standard French drain, dig a trench 12 to 18 inches wide and 18 to 24 inches deep with a slope of at least 1% (1 inch of drop per 8 feet of run). Line the trench with landscape filter fabric, add 2-3 inches of #57 gravel, lay the perforated pipe with holes facing down, then fill around and over the pipe with gravel to within 2-3 inches of the surface. Fold the fabric over the top and cover with topsoil or decorative stone. The fabric prevents soil from migrating into the gravel and clogging the system. For the concrete components of drainage structures like catch basins, use our concrete calculator.
Delivery and Ordering Guide
Ordering the right amount of gravel and having it delivered efficiently can save significant money compared to hauling bags from a home improvement store. Understanding how delivery works helps you prepare your site and avoid common ordering mistakes.
Bulk Delivery vs. Bagged
Bulk delivery becomes cost-effective for projects requiring more than 1-2 cubic yards. A standard dump truck holds 10-14 cubic yards, while a tandem dump truck holds 14-18 cubic yards. Delivery fees typically range from $50 to $150 depending on distance. Many suppliers offer free delivery for orders over 5 tons. Bagged gravel (typically 0.5 cubic feet per bag) costs $4 to $8 per bag, which translates to roughly $200 to $400 per cubic yard, making it 5-10 times more expensive than bulk.
Preparing for Delivery
Before the truck arrives, mark the dump location with cones or spray paint. Ensure the truck has adequate access, including clearance for overhead lines and branches, and a firm surface that can support the loaded truck weight (up to 40,000 pounds for a full tandem). One cubic yard of gravel makes a pile approximately 3 feet wide by 3 feet long by 3 feet high. Plan your dump location as close to the final installation area as possible, since wheelbarrowing gravel is extremely labor-intensive. A standard wheelbarrow holds about 3 cubic feet, or roughly 1/9 of a cubic yard.
How Much Extra to Order
Always order 5-10% more gravel than your calculated quantity to account for uneven ground, settling, and slight variations in depth. For structural applications requiring compaction, add 20-25% extra to account for the volume reduction during compaction. It is almost always cheaper to order a bit more upfront than to pay for a second delivery later.
Common Gravel Project Mistakes to Avoid
Gravel projects seem simple, but several common mistakes can lead to costly repairs and poor performance. Understanding these pitfalls before you start saves time and money.
Skipping the Base Layer on Driveways
Spreading surface gravel directly on dirt is the most common driveway mistake. Without a compacted base layer of larger angular stone, the surface gravel sinks into the soil, especially in wet conditions. Within a year, you will have ruts, mud showing through, and a surface that needs constant replenishment. Always build driveways in layers: large angular base, mid-size compactable layer, and fine surface gravel.
Using Rounded Gravel for Driveways
Pea gravel and river rock look attractive but are terrible driveway materials because their smooth, rounded shapes do not interlock. They roll under tires, spray to the sides, and never form a stable surface. Use angular crushed stone for any surface that needs to support traffic. Save rounded gravel for decorative applications, walkways, and garden beds where stability under load is not required.
Not Installing Edging
Without proper edging, gravel migrates into lawn areas, garden beds, and off walkways. Use metal or plastic landscape edging, pressure-treated lumber, or stone borders to contain gravel in its intended area. For driveways, consider concrete curbing or buried timbers along the edges. The edging should extend at least 1 inch above the gravel surface to effectively contain the material.
Ignoring Proper Drainage Slope
Gravel surfaces should always slope away from buildings at a minimum of 2% grade (1/4 inch per foot). Flat or improperly graded gravel areas collect water, become soft, and can direct runoff toward foundations. Crown driveways slightly in the center to shed water to both sides. For areas adjacent to your home, ensure the gravel surface directs water away from the foundation. If you need a retaining wall to manage grading, use our retaining wall calculator to estimate materials.
Gravel vs. Other Ground Cover Options
Gravel is not always the best choice for every application. Depending on your goals, budget, and site conditions, other materials may be more appropriate. For organic ground cover in garden beds, use our mulch calculator to estimate the quantity of bark, wood chips, or pine straw needed. For permanent surfaces that need to support heavy loads, a concrete slab may be a better long-term investment despite the higher upfront cost. And for areas where you want to build an elevated outdoor living space, our deck calculator can help you estimate lumber and hardware requirements.
When combining gravel with other materials in a larger landscape project, plan all your material quantities at once. This allows you to coordinate bulk deliveries, reduce shipping costs, and ensure all materials arrive before you begin work. A well-planned project with the right materials in the right quantities will save you multiple trips to the supply yard and keep your project on schedule and on budget.