Gravel Calculator
Estimate gravel for driveways, walkways, patios, drainage trenches, French drains, landscaping beds, shed pads, parking pads, and base layers. Calculate cubic yards, tons, truckloads, bags, compaction allowance, delivery cost, spreading cost, and total project budget.
Calculate Gravel Needed
Your Gravel Estimate
Formula used:
Practical recommendation:
Quick Formula Box
Area = length × width
Depth in feet = gravel depth in inches ÷ 12
Cubic feet = area × depth in feet
Base cubic yards = cubic feet ÷ 27
Order cubic yards = base cubic yards × (1 + extra allowance %) × (1 + compaction allowance %)
Estimated tons = order cubic yards × tons per cubic yard
Truckloads = ceil(order cubic yards ÷ truck capacity)
Total cost = gravel material cost + delivery + labor + tax
Gravel Coverage Reference Table
| Gravel Type | Best Use | Typical Planning Weight | Recommended Depth | Common Mistake |
|---|---|---|---|---|
| Pea gravel | Walkways, patios, garden paths, decorative areas | About 1.25–1.45 tons per cu yd | 2–3 inches for decorative cover | Using it on steep slopes or high-traffic driveways |
| Crushed stone | Driveways, shed pads, base layers, drainage | About 1.35–1.5 tons per cu yd | 3–6 inches depending on use | Skipping compaction for load-bearing areas |
| Crusher run / road base | Driveway base, compacted pads, sub-base | About 1.45–1.6 tons per cu yd | 4–8 inches for driveway base | Not compacting in layers |
| River rock | Landscape beds, dry creek beds, drainage accents | About 1.35–1.55 tons per cu yd | 2–4 inches for coverage | Using large river rock where walking comfort matters |
| Crushed limestone | Driveways, paths, patios, compacted base | About 1.35–1.55 tons per cu yd | 3–6 inches depending on traffic | Ignoring dust and fines when drainage is needed |
| Drainage gravel | French drains, trench drains, pipe bedding | About 1.25–1.45 tons per cu yd | Based on trench size and pipe design | Using compacted fines where free drainage is required |
| Decorative gravel | Low-maintenance landscape beds | Varies by stone type | 2–3 inches over fabric | Installing too thin and exposing fabric |
| Parking pad gravel | Light vehicle parking and utility areas | Often weight-limited in truckloads | 4–8 inches with base preparation | Using decorative stone instead of compactable base |
| Patio base gravel | Below pavers, slabs, and hardscape bases | About 1.4–1.6 tons per cu yd | 4–6 inches compacted base | Not allowing for compaction and leveling layer |
| Bulk delivery | Most projects over 1–2 cubic yards | Truck may be volume or weight limited | Confirm dump site and access | Forgetting delivery, labor, and spreading time |
How to Use the Gravel Calculator
Gravel Calculator Guide
A gravel calculator helps estimate the amount of gravel needed for driveways, walkways, patios, shed pads, parking areas, French drains, drainage trenches, garden beds, and landscaping projects. Gravel is commonly sold by the cubic yard, ton, truckload, or bag. Because the same project may be measured in feet, inches, cubic yards, and tons, a calculator makes planning faster and reduces ordering mistakes.
The basic gravel formula is straightforward: multiply length by width to find square footage, convert depth from inches to feet, multiply area by depth to find cubic feet, and divide by 27 to get cubic yards. Real projects also need allowance for compaction, uneven grade, edge loss, spreading waste, and measurement error. This calculator includes those practical adjustments so the final order estimate is closer to what you should actually buy.
What This Gravel Calculator Does
This tool estimates square feet, cubic feet, base cubic yards, adjusted order cubic yards, tons, truckloads, bag count, material cost, delivery cost, optional spreading labor, tax, and total project cost. It works for pea gravel, crushed stone, crusher run, road base, river rock, crushed limestone, drainage gravel, and general landscaping gravel.
To keep the workflow fast, the default calculator asks for only length, width, depth, and gravel type. Advanced Options are available for compaction, extra allowance, truck capacity, bag size, delivery fees, cost per cubic yard, labor, and tax. This makes the tool simple enough for homeowners and detailed enough for contractors, landscapers, and property managers.
Why Accurate Gravel Estimating Matters
Gravel is heavy, and small measurement errors can create large cost differences. A 40 by 10 foot driveway at 4 inches deep requires nearly 5 cubic yards before extra allowance. If that same area needs a compacted base, the order quantity may need to increase. Under-ordering can leave thin spots, weak base areas, or exposed fabric. Over-ordering can leave a pile of stone that is difficult to move.
Accurate estimating also helps compare bulk delivery versus bagged gravel. Bagged gravel is convenient for small patches, planters, or decorative projects. Bulk gravel is usually better for driveways, patios, shed pads, drainage trenches, and larger landscape beds. The calculator shows both cubic yards and bags so you can compare practical options.
Gravel Formula Explained
The standard gravel volume formula is:
Cubic feet = length × width × depth in feet
If the area is 40 feet long and 10 feet wide:
40 × 10 = 400 square feet
If the desired gravel depth is 4 inches:
4 ÷ 12 = 0.333 feet
Now calculate cubic feet:
400 × 0.333 = 133.3 cubic feet
Convert to cubic yards:
133.3 ÷ 27 = 4.94 cubic yards
If you add 10% extra and 10% compaction allowance:
4.94 × 1.10 × 1.10 = 5.98 cubic yards
Cubic Yards vs Tons
Gravel is often sold by the ton, but project volume is usually easier to calculate in cubic yards. The conversion depends on stone type, size, moisture, fines, and compaction. Many gravel products weigh roughly 1.25 to 1.6 tons per cubic yard. Crusher run and road base usually weigh more because they include fines that pack tightly. Pea gravel and drainage stone may be lighter per cubic yard depending on stone size and void space.
Suppliers may price gravel by cubic yard or by ton. If a supplier quotes by ton, use the estimated tons from this calculator as a planning number. If the supplier provides a specific density for the exact product, use that value for the most accurate estimate.
Choosing the Right Gravel Type
Pea gravel is rounded and attractive, making it useful for walkways, patios, garden paths, and decorative areas. However, it shifts under tires and is not the best choice for steep driveways or compacted bases. Crushed stone has angular edges that lock together better, making it suitable for driveways, shed pads, patios, and base layers.
Crusher run or road base contains a mix of stone and fines. It compacts tightly and is commonly used for driveway base, parking pads, and sub-base construction. River rock is decorative and useful in landscape beds or dry creek beds, but larger stones may be uncomfortable to walk on. Drainage gravel should allow water to pass through and is often used around perforated pipe, French drains, and trench drainage systems.
Practical Applications
Homeowner Uses
Contractor and Landscaper Uses
Depth Guidelines
Decorative gravel in landscape beds is often installed at 2 to 3 inches deep. Walkways may use 2 to 4 inches depending on soil conditions and edging. Driveways often need 4 to 8 inches or more, especially if the soil is soft or vehicles are heavy. Patio and paver bases commonly require a compacted gravel layer plus a leveling layer.
Drainage trenches are different because the gravel volume depends on trench width, depth, pipe size, and the gravel envelope around the pipe. For drainage work, make sure the gravel type is clean enough to allow water movement and use fabric where appropriate to reduce soil migration.
Common Mistakes to Avoid
A common mistake is entering depth in feet when the calculator expects inches. Another is using decorative stone for a compacted base. Rounded gravel can look attractive, but angular crushed stone usually locks together better for driveways and hardscape bases. Users also often forget edge loss, uneven grade, and compaction allowance.
Another mistake is ignoring delivery limits. Gravel is heavy, and a truck may reach its weight limit before reaching full volume capacity. Delivery access also matters. Narrow driveways, soft ground, overhead wires, slopes, and tight turns can limit where gravel can be dumped.
Drainage projects need special care. Gravel with too many fines may compact tightly and reduce water flow. For French drains and pipe bedding, clean drainage gravel is usually more appropriate than crusher run. Always choose the material based on the job, not just the lowest price.
Expert Recommendations
Measure the project area carefully and use a realistic average depth. Add 5% to 10% extra for most decorative projects and 10% to 20% for compacted base, rough grade, or driveway projects. Use angular crushed stone or road base for load-bearing applications, and use clean drainage gravel for water management.
For large projects, order bulk gravel. For small repairs, bags may be more convenient. Confirm whether your supplier sells by cubic yard, ton, or truckload. Ask about delivery fees, minimum loads, truck access, and whether the quoted gravel includes fines. For driveways and structural base work, compact the material in layers for better performance.
Conclusion
This gravel calculator estimates cubic yards, cubic feet, tons, truckloads, bags, delivery, labor, tax, and total cost for gravel projects. It helps homeowners, landscapers, contractors, and property managers plan material quantities with practical allowances for waste and compaction. Final ordering should be confirmed with supplier density, actual site measurements, delivery access, local pricing, drainage needs, and project specifications.