How Much Gravel Do I Need?
Use this guide to figure out the right gravel depth, calculate how many tons or cubic yards you need, and decide whether to buy bags or order in bulk.
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Use the Gravel Calculator →How Much Gravel Do I Need?
Quick answer: Multiply your project’s length by width by depth (in feet), divide by 27 to get cubic yards. For weight, multiply cubic yards by 1.4 to 1.5 to get tons. Or skip the math — use our gravel calculator to get the answer in seconds.
Getting the quantity right before you order matters. Gravel is heavy and difficult to return. Too little and your project looks thin and unfinished. Too much and you’re paying to haul away the overflow.
Why Depth Matters Most
Depth is the single biggest variable in how much gravel you need. Double the depth and you double the material — and the cost.
The right depth depends entirely on what you’re building. A decorative garden path needs far less than a driveway that has to carry a car’s weight. Getting this number right before you calculate anything else saves you from undershooting (gravel too thin to be functional) or overshooting (money wasted on material you don’t need).
Recommended Gravel Depth by Use Case
Driveway: 4–6 Inches
Driveways take the most punishment and need the most material. The standard recommendation is 4–6 inches of compacted gravel. If you’re building a new driveway from bare ground, aim for 6 inches. For a refresh or top-up on an existing driveway, 2–3 inches of new material is usually enough.
For a proper driveway base, many contractors recommend two layers: a coarser base layer (crusher run or dense-grade aggregate) topped with a finer finish layer (pea gravel or washed stone). If you’re doing this, plan each layer separately.
Path or Walkway: 2–3 Inches
A garden path or walkway doesn’t carry vehicle weight, so 2–3 inches of gravel is sufficient. At this depth, the path holds its shape underfoot, drains well, and won’t look sparse. Use 3 inches if the path gets regular foot traffic or if you want it to last several seasons without a top-up.
Patio: 3–4 Inches
A gravel patio sits between a driveway and a path in terms of load. Three to four inches gives you a stable, level surface that can hold furniture and foot traffic without shifting excessively. Edging the perimeter with pavers, landscape timbers, or metal edging will help contain the gravel and maintain depth over time.
Drainage Applications: 6 Inches or More
Gravel used for drainage trenches, French drains, dry creek beds, or foundation drainage needs to be deep enough to actually redirect water. Six inches is the minimum; 8–12 inches is common in more demanding drainage situations. For these applications, use a washed, angular stone (like #57 gravel) rather than smooth pea gravel — angular stone allows water to flow through the gaps more effectively.
Quick Depth Reference
| Use Case | Recommended Depth |
|---|---|
| Driveway (new) | 6 in |
| Driveway (refresh) | 2–3 in |
| Path / Walkway | 2–3 in |
| Patio | 3–4 in |
| Drainage / French drain | 6–12 in |
| Decorative garden border | 2 in |
How to Calculate How Much Gravel You Need
The Manual Formula
- Measure your project area in feet: length × width
- Convert your depth from inches to feet: divide inches by 12
- Multiply all three: length × width × depth (in feet) = cubic feet
- Divide by 27 to convert to cubic yards
- Multiply cubic yards by 1.4–1.5 to get approximate tons
Example: A 12-foot-wide, 50-foot-long driveway at 4 inches deep:
- 12 × 50 = 600 sq ft
- 4 inches ÷ 12 = 0.333 ft
- 600 × 0.333 = 200 cubic feet
- 200 ÷ 27 = 7.4 cubic yards
- 7.4 × 1.4 = approximately 10.4 tons
Use the Calculator
The formula works, but it gets tedious for irregular shapes or multi-zone projects. Our gravel calculator handles the conversion automatically — enter your dimensions and target depth, and it returns cubic yards, cubic feet, and approximate tons side by side.
It also accounts for common gravel types and their different densities, so you get a more accurate ton estimate than the rough 1.4–1.5 factor.
Tons vs Cubic Yards: What’s the Difference?
This is one of the most common points of confusion when ordering gravel.
Cubic yards is a volume measurement. It tells you how much space the gravel occupies. Landscapers and dump trucks often quote in cubic yards.
Tons is a weight measurement. Quarries and some suppliers price gravel by the ton because weight is how they track and bill material.
The conversion between them depends on the type of gravel, because different stones have different densities:
| Gravel Type | Approx. Tons per Cubic Yard |
|---|---|
| Pea gravel | 1.3–1.4 tons |
| Crushed stone / #57 | 1.4–1.5 tons |
| Crusher run / dense grade | 1.5–1.6 tons |
| River rock (larger) | 1.3–1.5 tons |
When does it matter? If you’re ordering from a quarry or landscaping supplier that bills by the ton, you need to know your cubic yard estimate first, then convert. If you’re renting a truck and want to stay under a weight limit, you need the ton figure. If you’re ordering from a landscaping yard that prices by the yard, cubic yards is all you need.
Most homeowners ordering a standard driveway or patio project don’t need to stress over this — the rough conversion (1 cubic yard ≈ 1.4 tons) gets you close enough to compare quotes.
Bags vs Bulk Gravel: When to Buy Each
Buying in Bulk
Bulk gravel is delivered by truck or can be picked up with a trailer from a quarry or landscape supply yard. It’s almost always the cheaper option per cubic yard once your project exceeds 1–2 cubic yards.
Choose bulk when:
- Your project needs more than 2 cubic yards
- You have a driveway or area where a truck can dump directly
- You want to keep costs down on a larger project
- You’re ordering crushed stone, dense-grade aggregate, or materials that aren’t typically sold in bags
Typical bulk pricing: $25–$55 per ton or $35–$65 per cubic yard, depending on material and region. Delivery fees typically add $50–$100 for smaller residential orders. Many suppliers have a 1-ton or 1-yard minimum.
Buying Bags
Bagged gravel (typically 0.5 cubic foot bags at big-box stores) is convenient for small projects, tight spaces, or situations where a delivery truck can’t access the area.
Choose bags when:
- Your project needs less than half a cubic yard
- You’re doing a quick decorative fill or topping up a small area
- You don’t have a way to take delivery of bulk material
- You need pea gravel or decorative stone in a specific color or size that’s only sold bagged
The cost reality: A typical 0.5 cu ft bag of pea gravel runs $5–$7. That’s about 54 bags per cubic yard, which adds up to $270–$378 per cubic yard — versus $35–$65 for bulk. For anything beyond a very small project, the cost difference is dramatic.
Bags vs Bulk Quick Reference
| Bags | Bulk | |
|---|---|---|
| Typical cost per cu yd equivalent | $270–$380 | $35–$65 |
| Best project size | Under 0.5 cu yd | 1 cu yd and up |
| Vehicle needed | Any car | Truck or delivery |
| Leftover storage | Easy | Difficult |
| Access to tight areas | Yes | Depends on truck |
Common Project Sizes: Quick Reference
Here are rough estimates for common gravel projects to help you ballpark quantities before you measure precisely.
| Project | Dimensions | Depth | Approx. Cubic Yards | Approx. Tons |
|---|---|---|---|---|
| Small garden path | 20 ft × 3 ft | 2 in | 0.4 cu yd | 0.5 tons |
| Medium walkway | 40 ft × 4 ft | 3 in | 1.5 cu yds | 2 tons |
| Small patio | 10 ft × 12 ft | 3 in | 1.1 cu yds | 1.5 tons |
| Medium patio | 16 ft × 20 ft | 4 in | 4 cu yds | 5.5 tons |
| Short driveway | 12 ft × 30 ft | 4 in | 4.4 cu yds | 6 tons |
| Standard driveway | 12 ft × 50 ft | 4 in | 7.4 cu yds | 10 tons |
| Long driveway | 12 ft × 100 ft | 6 in | 22 cu yds | 31 tons |
These are starting estimates. Measure your actual project before ordering — irregular shapes, varying depths, and waste from spreading all affect the final number.
Tips Before You Order
Add 10% for waste. Gravel shifts during spreading, some falls off edges, and you’ll want a small surplus to fill thin spots. Add 10% to your calculated volume before placing the order.
Compact as you go. Freshly placed gravel is loose and fluffy. Compacting it with a plate compactor or heavy roller reduces the depth — which means you may need slightly more than your raw calculation suggests. For driveways, plan for about 10–15% settling after compaction.
Know your gravel type before you order. Pea gravel, crushed stone, river rock, and crusher run are not interchangeable. They have different drainage properties, densities, and appropriate uses. If you’re unsure which type fits your project, see our types of gravel guide before you order a ton of the wrong material.
Get exact measurements. For any project over 2 cubic yards, take the time to measure carefully. An error of a foot or two on a 50-foot driveway means a meaningful difference in tons and cost. If you’re working with an irregular shape or an area that’s hard to measure by hand, our land area calculator lets you trace your project directly on a satellite map and get the square footage automatically.
Use our gravel calculator to run your numbers — it handles the unit conversions and gives you the cubic yards and approximate tons in one step.
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