Gravel Calculator
Calculate the amount of gravel needed for driveways, walkways, and landscaping projects. Estimate cubic yards, tons, and bags needed based on area dimensions, depth, and gravel type with multiple material options.
Complete Guide: Gravel Calculator
Everything you need to know about using this tool effectively
This gravel calculator estimates the volume and weight of gravel needed for driveways, walkways, garden beds, and drainage projects. Enter the length, width, and depth of your project area, select a gravel type, and get results in cubic yards, cubic meters, tons, and 50-pound bags. The formula is volume = length * width * depth, then weight = volume * material density.
The calculator converts all measurements to a common unit system, computes the volume of the rectangular area at the specified depth, and multiplies by the bulk density of the selected gravel type to find weight. Bulk density varies by material: standard gravel is about 1.4 tons per cubic yard, crushed stone is about 1.5, and pea gravel is about 1.3. The tool includes density values for standard gravel, crushed stone, pea gravel, river rock, limestone, and granite so you get accurate weight estimates for each material. A waste factor can be added to account for settling and uneven ground.
Driveway Installation
Homeowners calculate how many tons of crushed stone are needed for a stable gravel driveway at the recommended 3 to 4 inch depth.
Garden Path Construction
Gardeners estimate pea gravel volume for decorative walkways connecting beds and outdoor living areas.
French Drain Trenching
Contractors compute gravel volume for drainage trenches to ensure proper water flow and filtration.
Patio and Shed Base Preparation
DIY builders calculate gravel for a level base layer under pavers, sheds, or hot tubs.
Bulk Material Ordering
Landscapers compare cubic yard quotes from multiple suppliers by converting between volume and weight.
Measure Project Area
Find the length and width of the area in feet or meters. For irregular shapes, break the area into rectangles and add them.
Set Depth
Choose the desired gravel depth. Driveways typically need 3 to 4 inches, walkways 2 to 3 inches, and decorative beds 1 to 2 inches.
Select Gravel Type
Pick the material from the dropdown. The calculator uses the correct bulk density for weight estimates.
Click Calculate
The tool outputs volume in cubic yards and cubic meters, weight in tons, and equivalent 50-pound bag count.
Order with Extra
Add 10 to 15 percent for settling and irregular ground. Use the results to place your order with a local supplier.
Gravel compacts over time as it settles under traffic and rain. Order 10 to 15 percent more than the calculated volume to avoid running short.
Use landscape fabric beneath gravel to suppress weeds and prevent the material from sinking into the soil over time.
For drainage applications like French drains, use washed crushed stone rather than round pea gravel. Angular stones lock together and allow water to flow through gaps.
Compare suppliers by cost per ton delivered, not just per cubic yard, because bulk density varies and affects how much material you actually receive.
For curved or irregular areas, measure as a rectangle that encompasses the shape and round up. The waste factor covers the extra material.
How many tons of gravel do I need for a 20x10 driveway?
At 3 inches deep, the volume is 20 * 10 * 0.25 = 50 cubic feet, or about 1.85 cubic yards. Standard gravel at 1.4 tons per cubic yard gives roughly 2.6 tons. Add 10 percent for settling and order about 3 tons.
What is the difference between cubic yards and tons?
Cubic yards measure volume, the space the gravel fills. Tons measure weight. Because different gravel types have different densities, the same volume can weigh different amounts depending on the material.
What depth of gravel should I use for a driveway?
Most residential driveways need 3 to 4 inches of compacted gravel for cars and light trucks. Heavier vehicles or high-traffic areas may need 4 to 6 inches.
Which gravel type is best for driveways?
Crushed stone is best for driveways because the angular pieces lock together under compaction, creating a stable surface. Pea gravel shifts under tires and is better for decorative paths and garden beds.
Can I use this calculator for commercial projects?
Yes, but large commercial projects may have engineering specifications for compaction, gradation, and sub-base requirements. Consult a civil engineer for public infrastructure or heavy-duty applications.