Gravel Volume Calculator
Ordering gravel is a volume problem that turns into a weight problem: you measure an area and a depth, but suppliers sell by the cubic yard or by the ton. This calculator runs the full chain for rectangle, circle and triangle areas in feet or meters, converts volume to weight using the density of five real gravel types, adds your waste allowance, and finishes with bag count and an optional cost estimate. A two-layer mode prices a compacted base and a wearing surface separately, the way driveways are actually built.
Densities are typical values; your supplier’s actual density governs the final tonnage. A 10% allowance covers compaction and spillage on most jobs.
How much gravel to order
–
order weight (includes waste allowance)
Estimates only. Material densities are typical values and vary by quarry, moisture, and compaction. Confirm the actual density and pricing with your supplier before ordering; this tool does not replace a supplier quote.
Quick Answer
Cubic yards = (length × width × depth in feet) ÷ 27, and tons = cubic yards × the material's density, about 1.5 tons per cubic yard for crushed stone. A 24 × 12 ft driveway at 4 inches deep with a 10% waste allowance needs 3.91 cubic yards of crushed stone #57, which is 5.87 tons (11,733 lb), 212 bags at the 0.5 ft³ bag size, or about $322.67 at $55 per ton. The calculator above is pre-filled with this exact driveway.
Key takeaways
- Depth is measured in inches but volume is computed in feet. The depth conversion (inches ÷ 12) is where most hand estimates go wrong, usually by a factor of 12.
- Density, not volume, decides the tonnage. The same 3.91 cubic yards weighs 5.28 tons as pea gravel and 6.26 tons as crushed limestone.
- Order with the waste allowance already in. Gravel compacts and settles 10 to 20% under traffic, so the neat geometric volume is never quite enough.
- Bags are for small jobs. Anything past a yard or two is far cheaper as a bulk delivery than as 54 bags per cubic yard.
- Quick Answer
- How to use the gravel volume calculator
- The gravel math, step by step
- Gravel types and their densities
- Worked example: a 24 by 12 ft driveway
- How deep should the gravel be, and what does a ton cover?
- What competing calculators miss
- Common ordering mistakes
- Frequently asked questions
- Add This Calculator to Your Website
How to use the gravel volume calculator
Pick a shape, enter the dimensions and a finished depth, choose your material, and click Calculate. Results stay hidden until you click Calculate, and every output already includes your waste allowance.
- Shape: Rectangle for driveways, patios and paths; Circle for round beds and fire-pit surrounds (enter the diameter, straight across the widest point); Triangle for corner beds, where the Length and Width fields become Base and Height.
- Dimension units: feet or meters for the area measurements. Depth keeps its own selector, inches or centimeters, because that is how depths are actually measured on site.
- Depth: the finished, compacted thickness. A driveway wearing surface over an existing firm base can be 2 to 3 inches; a new driveway on soil wants 4 to 6 inches in total.
- Two-layer driveway: tick this when the build is a base plus a surface, for example 4 inches of crushed limestone under 2 inches of crushed stone #57. Each layer gets its own depth and material, the results show a per-layer breakdown, and the totals add both layers together. One honest limitation: a single price per ton is applied to the combined tonnage, so if your two materials are priced differently, run each layer as its own single-layer calculation for an exact cost split.
- Material, waste, price: the material sets the density that turns volume into tons. Waste defaults to 10%. Price per ton is optional: leave it out and the cost row simply stays hidden.
Building a slab on top of the stone instead? The base math here pairs with the concrete volume calculator for the pour itself, which works in the same cubic yards.
The gravel math, step by step
Every gravel estimate follows the same five-step chain, and the calculator runs all of it in order:
Volume in cubic feet = area × depth in feet (inches ÷ 12, or centimeters ÷ 30.48)
Volume in cubic yards = cubic feet ÷ 27
Order volume = cubic yards × (1 + waste% ÷ 100)
Weight in tons = order volume × density in tons per cubic yard
Bags = cubic feet including waste ÷ 0.5, rounded up | Cost = tons × price per ton
Two conversion details are worth knowing because they explain small differences between calculators. Meter dimensions are converted at 3.28084 feet per meter, and cubic yards are converted to cubic meters at 0.764555, both standard factors the U.S. Geological Survey and the National Institute of Standards and Technology publish for aggregate and unit work (see References). Weights are US short tons of 2,000 lb; kilograms use 907.1847 kg per ton. The results round the way suppliers talk: volume to two decimals, pounds and kilograms to whole numbers, and totals such as 0.80 cubic yards display as 0.8, because trailing zeros are dropped.
Gravel types and their densities
The density is the single number that turns a volume into an order weight, and it swings more across materials than most people expect. These are the five typical values built into the calculator; treat them as starting points and confirm with your supplier, since quarry, gradation and moisture all move the real figure.
| Material | Density (tons/yd³) | Cubic yards per ton | Typical use |
|---|---|---|---|
| Pea gravel | 1.35 | 0.74 | Paths, patios, playgrounds, decorative cover |
| Crushed stone #57 | 1.50 | 0.67 | Driveways, drainage, general base work |
| Crushed limestone | 1.60 | 0.63 | Compacts hard; bases and driveways |
| Bank gravel | 1.35 | 0.74 | Natural sand-and-gravel mix, base fill |
| River rock | 1.45 | 0.69 | Decorative rounded stone for landscaping |
Read the middle columns together: at the worked-example volume of 3.91 cubic yards, swapping pea gravel for crushed limestone moves the order from 5.28 tons to 6.26 tons, nearly a full ton on one driveway. Published industry ranges back these as typical mid-range values: the U.S. Geological Survey's crushed stone statistics track the aggregate industry these materials come from, and crushed stone is sold by weight at the quarry, which is why the scale ticket, not the loader bucket, settles what you pay for.
Worked example: a 24 by 12 ft driveway
The pre-filled run is a single-layer driveway: 24 feet long, 12 feet wide, 4 inches of crushed stone #57, a 10% waste allowance, priced at $55 per ton. Here is every line the calculator returns, plus the two-layer build of the same driveway.
| Output | Single layer (worked example) | Two-layer build |
|---|---|---|
| Order weight | 5.87 tons | 9.19 tons |
| Volume | 3.91 yd³ (105.6 ft³, 2.99 m³) | 5.87 yd³ (158.4 ft³, 4.49 m³) |
| Weight in lb / kg | 11,733 lb / 5,322 kg | 18,382 lb / 8,338 kg |
| Bags (0.5 ft³) | 212 bags | 317 bags |
| Estimated cost at $55/ton | $322.67 | $505.51 |
Check the single layer by hand: 24 × 12 = 288 ft², times 4 ÷ 12 = 0.333 ft of depth gives 96 ft³, divided by 27 gives 3.56 yd³, plus 10% gives 3.91 yd³, times 1.5 tons per yard gives 5.87 tons. The two-layer column stacks a 4 inch crushed limestone base (3.91 yd³, 6.26 tons) under a 2 inch crushed stone #57 surface (1.96 yd³, 2.93 tons) on the same footprint, which is how a contractor would actually spec this drive. Note the two-layer cost applies the one $55 price to the combined 9.19 tons, as disclosed in the how-to steps.
How deep should the gravel be, and what does a ton cover?
Two inches suits garden paths and decorative cover, 3 to 4 inches suits patios, and 4 to 6 inches suits driveways that carry cars, deeper on soft ground. Too thin and soil shows through after the first hard rain; too thick and you are paying for stone nobody ever sees. For a new driveway, splitting the depth into a compacted base layer plus a thinner wearing surface (the two-layer mode above) outlasts one deep loose layer every time, a build sequence the Federal Highway Administration's gravel roads guide recommends for unpaved surfaces generally.
Coverage per ton is the quick sanity check when a supplier quotes by weight. At the crushed stone #57 density of 1.5 tons per cubic yard, one ton is 18 cubic feet of stone, so it covers:
Each bar is the calculator's own math run backwards: a 9 × 6 ft patch (54 ft²) at 4 inches deep with no waste allowance returns exactly 1 ton of crushed stone #57. Doubling the depth halves the coverage, which is why a quote that sounds cheap at 2 inches gets expensive at 6. If the surface will be asphalt rather than loose stone, the asphalt volume calculator handles that material's own density and compaction.
What competing calculators miss
The big gravel calculators are strong on the basic rectangle, but each leaves a gap this page covers:
- Inch Calculator: the reference guide for the keyword, with sound density ranges (most gravel at 1.4 to 1.7 tons per cubic yard). The gaps: no two-layer build, no triangle shape, and weight shown as a min-to-max range from a density band rather than a per-material figure you can order against.
- Ergeon: its draw-on-a-satellite-map area tool is genuinely clever for irregular lots, and its density band (1.28 to 1.42 tons per cubic yard) is honest. But one band for all gravel understates dense limestone, and there are no bags, no per-layer split and no waste percentage you control.
- Omni Calculator: deep unit flexibility on its river rock tool, with density in kg/m³. The gap for a US driveway job: no tons-and-bags ordering view, no two-layer mode, and the example math is metric-first.
- Eartheasy: a friendly tool with a custom density field and priced-per-bag option. The gaps: rectangle-only thinking in its guidance, no per-layer breakdown, and its quick answer (a 10 × 10 ft area at 2 inches giving roughly 0.85 tons) quietly assumes a density it never states next to the number.
- The gap this page fills: three shapes, five named materials with stated densities, a real two-layer driveway mode with a per-layer breakdown, bags and cost in the same run, and every number on the page reproducible in the tool above, including the coverage bars.
Common ordering mistakes
Four mistakes account for nearly every short load and every leftover pile:
- Feeding inches into a feet formula. Entering a depth of 4 where the formula expects 0.333 understates or overstates the volume twelvefold depending on direction. This calculator keeps depth in its own unit field so the conversion cannot be skipped.
- Ordering the neat volume. Gravel compacts under traffic and fills low spots in the subgrade. Skip the allowance and the last corner of the drive ends up bare. Ten percent is the floor, not the ceiling.
- Using one density for every stone. A yard of pea gravel and a yard of crushed limestone differ by a quarter of a ton. On a 10 yard order that is 2.5 tons of surprise, in one direction or the other.
- Mixing up who sells what. Some yards sell by the ton, others by the cubic yard. Convert with the density before you compare quotes, and ask whether delivery and the waste allowance are included. The same warning applies when the material is dirt rather than stone: the fill volume calculator covers fill and soil volumes, where densities differ again.
Frequently asked questions
Multiply cubic yards by the material density and include your waste allowance. For crushed stone #57 at 1.5 tons per cubic yard, the 24 by 12 ft driveway at 4 inches deep in the worked example needs 3.91 cubic yards, which is 5.87 tons with a 10% allowance. The calculator runs the whole chain from your dimensions.
It depends on the material: divide 1 by the density. One ton of crushed stone #57 (1.5 tons per cubic yard) is about 0.67 cubic yards, one ton of pea gravel (1.35) is about 0.74 cubic yards, and one ton of crushed limestone (1.6) is about 0.63 cubic yards.
4 to 6 inches compacted, with 4 inches the common target on firm ground. Use 2 inches for garden paths and decorative cover, and 3 to 4 inches for patios. On soft or muddy ground, go deeper, or split the depth into a base layer and a surface layer using the two-layer mode.
Yes. Pick the Circle shape and enter the diameter; the area is pi times (diameter divided by 2) squared. Pick Triangle for corner beds and the Length and Width fields become Base and Height, with the area at half of base times height. Depth, material, waste and price work the same for all three shapes.
Yes. The calculator defaults to a 10% waste and compaction allowance, which suits most jobs. Use 15 to 20% for deep fills that will be mechanically compacted, and 0% only when you want the neat geometric volume for a comparison quote.
54 bags. A cubic yard is 27 cubic feet and the standard bag in this calculator is 0.5 cubic feet, so 27 divided by 0.5 is 54. The bag count rounds up and includes your waste allowance, which is why the worked example shows 212 bags for its 105.6 cubic feet.
Yes. Moisture adds weight without adding volume, so a wet load bought by the ton covers less area than the same weight delivered dry. The densities in this calculator are typical dry values, so confirm the actual density with your supplier, especially after heavy rain.
The volume outputs (cubic yards, cubic feet and cubic meters) are correct for any material spread at a uniform depth. The weight, bag and cost lines use the five gravel densities in the material list, so they will mislead for sand, soil or mulch unless that material happens to match one of those densities.
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References
- U.S. Geological Survey, National Minerals Information Center. Crushed Stone Statistics and Information. Accessed October 21, 2026.
- U.S. Geological Survey, National Minerals Information Center. Construction Sand and Gravel Statistics and Information. Accessed October 21, 2026.
- Federal Highway Administration. Gravel Roads: Construction and Maintenance Guide. Accessed October 21, 2026.
- Federal Highway Administration. User Guidelines for Waste and Byproduct Materials in Pavement Construction: Coarse Aggregate. Accessed October 21, 2026.
- National Institute of Standards and Technology. NIST Handbook 44: Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. Accessed October 21, 2026.