Gravel Calculator
To calculate how much gravel you need, multiply the length of your project area by the width to find the total square footage, multiply by the desired depth in feet to get cubic feet, and divide by 27 to convert to cubic yards. Because standard gravel weighs about 1.4 tons per cubic yard, multiply your total cubic yards by 1.4 to find the total weight in tons. For smaller projects using pre-packaged bags, one standard 0.5 cubic foot bag covers 3 square feet at a 2 inch depth, meaning you need 54 bags per cubic yard.
Calculate Gravel Needed
Inputs
Recommended: 2-4 inches for pathways, 4-6 inches for driveways
Standard Gravel
General purpose gravel (mixed type)
Cost Calculation (Optional)
Enter price in one format - total cost will be calculated automatically
Results
(Enter values to calculate)Results will appear here
Enter your dimensions and gravel specifications on the left to calculate volume, weight, and cost instantly
How to Calculate Gravel Needed for Your Project
Calculating aggregate materials requires converting three dimensional space into total weight or bag counts. Taking accurate measurements prevents overspending on excess material or delaying work due to shortages.
1. Measure Your Coverage Area
Measure the length and width of your project area in feet. For rectangular areas, multiply length by width to determine total square footage. For circular spaces, measure the distance across the middle to find the diameter, divide the diameter by 2 to get the radius, square the radius, and multiply by 3.14.
2. Determine Required Depth
Convert your desired depth from inches to feet by dividing by 12. Common depth standards include:
- Walkways and Patios: 2 to 3 inches (0.16 to 0.25 feet)
- Driveways and Parking Areas: 4 to 6 inches (0.33 to 0.50 feet)
- Drainage Trenches and Base Layers: 6 to 8 inches (0.50 to 0.67 feet)
3. Calculate Volume in Cubic Feet and Cubic Yards
Multiply your total square footage by the depth in feet to get the volume in cubic feet. Divide the cubic feet by 27 to find total cubic yards.
4. Convert Volume to Weight in Tons
Most natural stone aggregate weighs approximately 2,800 pounds per cubic yard, which equals 1.4 short tons. Multiply your total cubic yards by 1.4 to calculate total tonnage. Always add a 5% to 10% waste factor to account for ground compaction and irregular borders.
Gravel Formula and Conversion Reference
When calculating materials manually, use these standard mathematical formulas and material density values.
Total Square Feet = Length (ft) x Width (ft) Depth in Feet = Depth (in) / 12 Cubic Feet = Total Square Feet x Depth in Feet Cubic Yards = Cubic Feet / 27 Total Tons = Cubic Yards x Density Factor (Default: 1.4) Total Bags = Cubic Feet / Bag Size in Cubic Feet
| Material Type | Weight per Cubic Foot | Weight per Cubic Yard | Tons per Cubic Yard |
|---|---|---|---|
| Pea Gravel | 100 lbs | 2,700 lbs | 1.35 Tons |
| Crushed Stone (#57) | 105 lbs | 2,835 lbs | 1.42 Tons |
| River Rock | 108 lbs | 2,916 lbs | 1.46 Tons |
| Decomposed Granite | 110 lbs | 2,970 lbs | 1.49 Tons |
| Bank Run Gravel | 115 lbs | 3,105 lbs | 1.55 Tons |
Coverage Chart by Square Footage
The table below shows total material requirements based on a standard 2 inch depth using a density factor of 1.4 tons per cubic yard.
| Project Area | Volume (Cubic Feet) | Volume (Cubic Yards) | Estimated Weight (Tons) | 0.5 cu ft Bags Needed |
|---|---|---|---|---|
| 50 sq ft | 8.33 cu ft | 0.31 cu yd | 0.43 Tons | 17 Bags |
| 100 sq ft | 16.67 cu ft | 0.62 cu yd | 0.87 Tons | 34 Bags |
| 250 sq ft | 41.67 cu ft | 1.54 cu yd | 2.16 Tons | 84 Bags |
| 500 sq ft | 83.33 cu ft | 3.09 cu yd | 4.33 Tons | 167 Bags |
| 1,000 sq ft | 166.67 cu ft | 6.17 cu yd | 8.64 Tons | 334 Bags |
Common Gravel Types and Applications
Selecting the right aggregate depends on whether your project requires drainage, visual appeal, or structural strength.
Pea Gravel
Pea gravel consists of small, smooth, rounded stones roughly the size of a pea. Because of its soft texture underfoot, homeowners frequently choose it for garden paths, dog runs, and play spaces. Pea gravel tends to shift under heavy loads, so sturdy edging is recommended to keep it contained.
Crushed Stone
Crushed stone features sharp, angular edges that interlock under weight, creating a stable surface. Size #57 crushed stone is widely used as a base layer for concrete pads, retaining walls, and sub-bases. You can plan base layer earthworks using our excavation calculator to ensure proper trench depth.
River Rock
River rocks are larger, naturally smoothed stones ranging from 1 to 3 inches or more in diameter. Their primary uses include dry creek beds, pond borders, and decorative garden accents. Their larger size provides excellent erosion control along sloped landscapes.
Decomposed Granite
Decomposed granite is a fine, natural granite material that packs down tightly. It works well for rustic footpaths, patio surfaces, and driveway toppings. When combined with a stabilizing binder, it produces a hard, durable surface that resists water washouts.
Recommended Depth Guidelines by Project Type
Using the correct thickness prevents weeds from poking through and keeps stone from shifting down into the underlying soil.
- Landscape Borders and Garden Beds: A 2 inch layer provides full soil coverage without smothering plant root systems.
- Pedestrian Pathways and Patios: A 3 inch layer balances foot comfort with surface stability.
- Residential Driveways: Driveways require a total depth of 4 to 6 inches, ideally applied over a crushed aggregate base.
- French Drains and Utility Trenches: A depth of 6 to 8 inches of coarse stone ensures water flows freely around drain pipes. If your project involves pouring a concrete curb or border around your drive, check our concrete calculator for exact yardage.
Estimating Costs and Delivery
Gravel pricing depends on material type, local availability, order volume, and delivery distance.
Buying in Bulk vs. Buying Bagged
Bulk delivery by the ton or cubic yard is the most cost-effective choice for projects larger than 100 square feet. Bagged gravel from home improvement stores works best for small garden accents, potting projects, or quick repairs. Buying in bulk typically saves 50% to 70% compared to equivalent bag quantities.
Additional Project Costs
- Delivery Fees: Local quarries and suppliers usually charge flat delivery fees based on distance or truck size.
- Geotextile Fabric: Installing heavy-duty landscape fabric under aggregate prevents weeds and keeps stone from sinking into the soil.
- Compaction and Rental Tools: Hiring plate compactors or excavators adds to overall equipment expenses. You can project total tool rentals and site clearing expenses with our construction cost calculator.
Frequently Asked Questions
How many square feet does a ton of gravel cover?
One ton of gravel covers approximately 100 square feet at a 2 inch depth. Coverage decreases to 50 square feet at a 4 inch depth and 33 square feet at a 6 inch depth.
How much does 1 cubic yard of gravel weigh?
One cubic yard of dry, standard gravel weighs between 2,700 and 2,900 pounds, or roughly 1.35 to 1.45 tons.
How many bags of gravel make a cubic yard?
It takes 54 standard bags of gravel (0.5 cubic feet each) to equal 1 cubic yard. If using 0.4 cubic foot bags, you need 68 bags.
What is the difference between gravel and crushed stone?
Gravel is naturally weathered rock with rounded edges produced by water erosion. Crushed stone is mechanically broken rock featuring sharp, angular edges that lock together when compacted.
How thick should a gravel driveway be?
A gravel driveway should be 4 to 6 inches thick. For best results, lay a 4 inch base of coarse crushed stone followed by a 2 inch top layer of smaller aggregate.
How do I calculate gravel for a circular patio?
Measure the circle diameter in feet and divide by 2 to find the radius. Multiply the radius by itself, multiply by 3.14 to get the total area in square feet, and then multiply by your depth in feet. Divide by 27 to find cubic yards.