How to Calculate Gravel Quantity, Weight & Cost
Gravel is unusual among bulk construction materials because it is bought two completely different ways — by volume (cubic yards) when it is loaded by the bucket, and by weight (tons) when it crosses a scale. The bridge between those two units is density, and density is exactly where gravel estimating goes wrong: a yard of dry pea gravel and a yard of damp bank-run can differ by 20% or more in tonnage, so ordering the right amount means nothing if you ordered it in the wrong unit at the wrong density. On top of that, gravel that is dumped loose loses roughly a fifth of its volume once it is compacted — so a base that measures right on paper can come up short on the ground.
This calculator is the canonical gravel estimator for the whole cluster: it takes your project shape (rectangle, circle, or triangle), its dimensions and depth in any common unit, and a gravel type or custom density, then returns the area, the volume in cubic yards, cubic feet, and cubic meters, the weight in tons, pounds, and kilograms, and an optional cost from a price per ton or per cubic yard. It teaches the underlying density model so the rest of the gravel toolkit — the pea gravel calculator, gravel cost calculator, and tons-to-yards converter — all build on the same arithmetic.
Key Features of the Gravel Calculator
Volume in Yards, Feet & Meters
Returns the same pour in cubic yards (the US bulk-ordering unit), cubic feet (for depth checks), and cubic meters (for metric jobs) in one pass — no hand conversion.
Tonnage From Real Density
Converts volume to tons, pounds, and kilograms using the density of the gravel type you pick, so the weight you order matches what the scale house will actually charge.
Five Built-In Material Densities
Preset densities for general gravel, pea gravel, crushed stone, and aquarium gravel load automatically — or enter a Custom Density in lb/ft³ straight from your supplier's spec sheet.
Three Project Shapes
Handles rectangular beds, circular fire-pit or tank surrounds, and triangular infill areas — the area math switches automatically when you change the shape selector.
Independent Depth Unit
Depth carries its own unit selector, so you can lay out the footprint in feet while specifying the gravel layer in inches or centimeters without converting anything by hand.
Configurable Waste / Compaction Factor
A waste field (default 10%) covers spillage, raking loss, and the volume gravel loses when it is compacted — it is applied before both the weight and the cost are computed.
Dual-Mode Cost Estimate
Enter a price per ton or per cubic yard and the calculator prices the job on the matching unit — useful because some yards quote by weight and others by volume.
Density Read-Back
The results panel shows the exact density used (lb/ft³) alongside the tonnage, so you can confirm the assumption that drove your weight before placing the order.
Metric Outputs Included
Every result carries a metric twin — area in m², volume in m³, and weight in kilograms — for projects documented in SI units.
Instant In-Browser Calculation
All math runs locally in your browser — no account, no sign-up, no server round-trip. Results appear the moment you press Calculate.
Print / Save Estimate as PDF
One click opens a clean, branded summary of every input and result; choose Save as PDF in your browser's print dialog to keep an ordering record.
E-E-A-T Reviewed Density Model
The density values, conversion factors, and tonnage math are reviewed by Engr. Muhammad Qasim (Registered Civil Engineer, PEC No. 63430) for technical accuracy.
How to Use the Gravel Calculator
- 1In Step 1 — Shape & Units, choose your project shape (Rectangle, Circle, or Triangle) and the dimension unit (in, ft, cm, or m) the footprint is measured in.
- 2In Step 2 — Dimensions, enter the footprint measurements: Length and Width for a rectangle, Radius for a circle, or Base and Height for a triangle.
- 3Enter the gravel Depth and pick its own unit. Depth is usually given in inches even when the footprint is in feet — 2–3 in for decorative cover, 3–4 in for walkways, 4–6 in for a driveway base.
- 4In Step 3 — Material & Cost, choose a Gravel Type to load its preset density (General 105, Pea 100, Crushed Stone 105, Aquarium 100 lb/ft³), or select Custom Density to type your supplier's exact figure.
- 5Set the Waste Factor (default 10%). Use about 10% for loose decorative cover, and 20–25% when the gravel must be compacted into a base course, because compaction shrinks the loose volume.
- 6Optionally enter a Price and choose whether it is per Ton or per Cubic Yard — match this to how your supplier quotes so the cost lines up with the invoice.
- 7Press Calculate. The results panel returns the volume in yd³, ft³, and m³, the weight in tons, pounds, and kilograms, the total area, the density used, and the estimated cost.
- 8Check the Density Used read-back against your material — if it does not match the gravel you are buying, switch to Custom Density and re-run, since density drives the entire tonnage figure.
- 9For an irregular footprint, split it into rectangles, circles, and triangles, run each shape separately, and add the cubic-yard results before ordering.
- 10Click Print / Save to open a branded summary of inputs and results, then choose Save as PDF in your browser's print dialog to keep an ordering record.
Formulas Used in the Calculator
- 1) Footprint AreaRectangle: Area = Length × Width | Circle: Area = π × Radius² | Triangle: Area = (Base × Height) ÷ 2
All dimensions are converted to feet before the area is computed, so a footprint mixed across units resolves to a single square-foot value. - 2) Loose VolumeVolume (ft³) = Area (ft²) × Depth (ft) | Volume (yd³) = Volume (ft³) ÷ 27
Depth is converted to feet from its own unit first. The cubic-yard figure (÷ 27) is the number a bulk supplier loads against. - 3) Waste / Compaction AdjustmentAdjusted Volume = Loose Volume × (1 + Waste% ÷ 100)
Applied to the volume before weight and cost are computed. 10% covers handling loss for decorative work; 20–25% accounts for the volume lost when gravel is compacted into a base. - 4) Weight From DensityWeight (lb) = Adjusted Volume (ft³) × Density (lb/ft³) | Weight (tons) = Weight (lb) ÷ 2000
Density is the bridge between volume and tonnage. The calculator uses your selected material's density (or your custom value), which is why two equal-volume orders can differ in tons. - 5) Tons-to-Yards Relationshiptons/yd³ = Density (lb/ft³) × 27 ÷ 2000
At 105 lb/ft³ this gives ≈ 1.42 tons per cubic yard; at 100 lb/ft³, ≈ 1.35. Invert it (yd³/ton = 1 ÷ tons/yd³) to convert a tonnage quote back to volume. - 6) Estimated CostCost = Price/ton × Weight (tons) or Price/yd³ × Volume (yd³)
The calculator prices on whichever unit you selected. Material only — it excludes delivery, spreading labor, and fuel surcharges; for a full budget use the gravel cost calculator.
Worked Example: A 12 × 12 ft Gravel Area
Suppose you are covering a 12 ft × 12 ft area with 4 in of general gravel (105 lb/ft³), using the default 10% waste. Start with the footprint: 12 ft × 12 ft = 144 ft². Convert the depth to feet — 4 in ÷ 12 = 0.333 ft — and multiply: 144 ft² × 0.333 ft = 48 ft³ of loose gravel, which is 48 ÷ 27 = 1.78 yd³. Now apply the 10% waste factor: 48 × 1.10 = 52.8 ft³, or 1.96 yd³. To get the weight, multiply the adjusted cubic feet by the density: 52.8 ft³ × 105 lb/ft³ = 5,544 lb, which is 5,544 ÷ 2000 = 2.77 tons. If your supplier sells this material at $40 per ton, the material cost is 2.77 × $40 = $110.88. Notice that the same 1.96 yd³ ordered as pea gravel (100 lb/ft³) would weigh only 2.64 tons — the volume is identical, but the tonnage and the bill both change with density. That single fact is why this calculator leads with material type, not just dimensions.
Gravel Density & Tonnage Reference Guide
Density is the one number that turns a volume into a weight, and it varies by stone type, gradation, and moisture. The table below lists typical dry, loose densities for common gravel materials, the resulting tons per cubic yard, and the approximate cubic yards you get from one ton. Use it to sanity-check the tonnage the calculator returns — and as a quick lookup when a supplier quotes a material you have not priced before.
| Gravel Material | Density (lb/ft³) | Density (kg/m³) | Tons / yd³ | yd³ / Ton |
|---|---|---|---|---|
| Pea gravel (⅜ in, rounded) | 95–100 | 1,520–1,600 | 1.28–1.35 | 0.74–0.78 |
| Crushed stone (#57, ¾ in) | 100–105 | 1,600–1,680 | 1.35–1.42 | 0.70–0.74 |
| General / all-purpose gravel | 105 | 1,680 | 1.42 | 0.70 |
| Bank-run gravel (sand + stone mix) | 110–120 | 1,760–1,920 | 1.49–1.62 | 0.62–0.67 |
| Crusher-run / screenings (dense-graded) | 115–125 | 1,840–2,000 | 1.55–1.69 | 0.59–0.65 |
Tons/yd³ = density (lb/ft³) × 27 ÷ 2000. Values are dry, loose figures; damp or compacted material weighs more. Where a material falls in this cluster — pea, crushed, or driveway base — there is a dedicated calculator linked below.
Moisture, Compaction & Regional Naming
Three variables move gravel density away from the dry, loose values above. Moisture adds weight without adding volume — saturated gravel can run 5–15% heavier than the same material dry, which matters when you are paying by the ton. Compaction works the other way on volume: dense-graded base gravel loses roughly 20–25% of its loose volume once it is rolled, so a 4 in compacted base needs closer to 5 in of loose material delivered. And regional naming hides all of this behind different labels — the same dense-graded base is "crusher run" or "ABC" in the Southeast, "Class 5" in the Upper Midwest, "¾-minus" or "road base" in the West, and "Type 1 / MOT" in the UK. Because the names differ but the density does not, always confirm the lb/ft³ (or kg/m³) figure with your supplier and drop it into Custom Density rather than trusting the label alone.
Common Gravel Estimating Mistakes
- Ordering the wrong unit. Suppliers sell gravel by the ton and by the cubic yard, and the two are not interchangeable without density. Ordering "3" when the yard means tons and you meant yards leaves you ~30% short — always state the unit and let the tons-to-yards calculator reconcile a quote.
- Using one density for every gravel. Pea gravel (~100 lb/ft³) and crusher-run (~120 lb/ft³) differ by 20% in weight for the same volume. Picking the matching material type — or entering a Custom Density — is the difference between the right tonnage and a guess.
- Ignoring compaction on a base. The calculator returns loose volume. A base course that has to be compacted shrinks 20–25%, so a plain volume order comes up short. Bump the waste factor to 20–25% for compacted base work, or use the gravel driveway calculator for layered builds.
- Forgetting moisture when paying by weight. Damp or freshly washed gravel weighs 5–15% more than dry. If you are billed by the ton, a rain-soaked load delivers less actual coverage than the tonnage suggests — order a little extra in wet conditions.
When to Use This vs. a Related Calculator
Use this calculator as the all-purpose starting point whenever you need the volume, weight, or rough cost of gravel for any project — it teaches the density model the rest of the cluster relies on. For a specific job, a purpose-built spoke gives cleaner presets and guidance: the pea gravel calculator for decorative pathways and patios where coverage depth and stone migration matter; the aquarium gravel calculator for substrate depth by tank size and pounds per gallon; the gravel driveway calculator for multi-layer sub-base, base, and surface build-ups with compaction per layer; the gravel cost calculator when delivery, spread labor, and regional pricing drive the budget; and the gravel tons-to-yards calculator when you only need to convert a supplier's tonnage quote into the volume you actually ordered.
Standards & References
Defines the size numbers (#1 through #10, plus blends like #57 and #67) that suppliers use to name gravel and crushed stone. Knowing the size class helps you match the density preset in this calculator to the material you are actually buying.
Specifies grading and quality requirements for coarse and fine aggregates. The unit weights used to convert gravel volume to tonnage are based on aggregates meeting this standard, which is why washed, well-graded stone tracks the table densities closely.
Governs the dense-graded base aggregates (crusher-run, ABC, Class 5) that are placed and compacted under pavements. It explains why base gravel is ordered with a 20–25% compaction allowance rather than the loose volume this calculator computes.
Density and tonnage figures are typical dry, loose values; actual weight varies with moisture, gradation, and compaction. Confirm the compaction factor and material specification with your supplier before ordering for structural fill, base course, or load-bearing applications.
Frequently Asked Questions
How do I calculate how much gravel I need?
Multiply the footprint area by the gravel depth, with all dimensions in the same unit, then convert to cubic yards by dividing the cubic-foot result by 27. For example, a 12 × 12 ft area at 4 in deep is 144 ft² × 0.333 ft = 48 ft³ ÷ 27 = 1.78 yd³. This calculator does the unit conversion and the tonnage automatically once you enter the dimensions and pick a gravel type.
How do I convert cubic yards of gravel to tons?
Multiply cubic yards by the material's tons-per-yard factor, which comes from its density: tons/yd³ = density (lb/ft³) × 27 ÷ 2000. General gravel at 105 lb/ft³ is about 1.42 tons per cubic yard, while pea gravel at 100 lb/ft³ is about 1.35. So 2 yd³ of general gravel weighs roughly 2.84 tons. The calculator applies the correct factor for the gravel type you select.
How much does a cubic yard of gravel weigh?
A cubic yard of typical dry gravel weighs about 2,700 to 3,100 lb, or roughly 1.35 to 1.55 tons, depending on the stone type. Pea gravel is at the lighter end (~2,700 lb) and dense-graded crusher-run at the heavier end (~3,100 lb). Moisture raises these figures by 5 to 15 percent.
How many cubic yards are in a ton of gravel?
Invert the tons-per-yard factor: yd³/ton = 1 ÷ (tons/yd³). For general gravel at 1.42 tons/yd³ that is about 0.70 cubic yards per ton; for lighter pea gravel, closer to 0.74. As a rule of thumb, one ton of gravel covers roughly 0.7 cubic yards of loose volume.
What is the density of gravel?
Common gravels run from about 95 lb/ft³ for loose pea gravel to 125 lb/ft³ for dense-graded crusher-run, with general all-purpose gravel near 105 lb/ft³ (about 1,680 kg/m³). The exact value depends on stone type, gradation, and moisture. If your supplier gives an exact figure, enter it under Custom Density for the most accurate tonnage.
How deep should gravel be?
Depth depends on the use: 2 to 3 inches for decorative ground cover and mulch beds, 3 to 4 inches for a walkway or patio base, and 4 to 6 inches for a driveway base over a prepared sub-grade. Deeper layers may be split into a compacted sub-base and a surface course — the gravel driveway calculator handles multi-layer build-ups.
Should I order gravel by the ton or by the cubic yard?
It depends on how your supplier quotes — some sell by weight (ton), others by volume (cubic yard). Neither is wrong, but the two only match if you use the right density to convert. State the unit explicitly when ordering, and use the density read-back in this calculator to translate between them so you do not end up 30 percent short.
How much extra gravel should I add for waste and compaction?
Add about 10 percent for loose decorative cover to allow for spillage and uneven ground. For a base course that must be compacted, add 20 to 25 percent instead, because dense-graded gravel loses roughly a fifth of its loose volume once it is rolled. The calculator's waste field lets you set this directly.
Does gravel weigh more when it is wet?
Yes. Water clinging to the stone adds weight without adding volume, so damp or freshly washed gravel can weigh 5 to 15 percent more than the same material dry. If you are paying by the ton, a wet load delivers slightly less actual coverage than the tonnage implies, so order a little extra in wet conditions.
What is the difference between pea gravel, crushed stone, and bank-run gravel?
Pea gravel is small (about ⅜ in), rounded, and decorative, with a density near 100 lb/ft³. Crushed stone is angular and graded by size number (such as #57), locks together well, and runs about 100 to 105 lb/ft³. Bank-run gravel is an unscreened sand-and-stone mix straight from the pit at 110 to 120 lb/ft³. For decorative pea-gravel jobs, the pea gravel calculator has tailored coverage guidance.
How do I calculate gravel for a circular or triangular area?
Switch the shape selector. For a circle, the calculator uses Area = π × radius², so a 6 ft radius gives about 113 ft²; for a triangle it uses Area = (base × height) ÷ 2. It then multiplies by depth exactly as it does for a rectangle. For an L-shaped or irregular area, split it into simple shapes, run each, and add the cubic-yard results.
How much gravel do I need for a 10 x 10 ft area at 3 inches deep?
The footprint is 100 ft², and 3 in is 0.25 ft, so the loose volume is 100 × 0.25 = 25 ft³ ÷ 27 = 0.93 yd³. At a general gravel density of 105 lb/ft³ that is about 1.31 tons before waste. Adding the default 10 percent brings it to roughly 1.02 yd³ and 1.44 tons.
What does a gravel size number like #57 mean?
Size numbers come from ASTM D448, which classifies aggregate by the range of sieve sizes it passes. A #57 stone, for example, is roughly ¾ in to 1 in material with the fines screened out, which is why it drains well and is popular for driveways and drainage. The size affects how the stone packs and drains but only slightly changes its density.
Is gravel the same as crushed stone or aggregate?
They overlap but are not identical. 'Gravel' traditionally means naturally rounded stone, 'crushed stone' is mechanically broken angular rock, and 'aggregate' is the umbrella term for both plus sand and recycled material used in concrete and base courses. This calculator covers all of them — just match the density to the specific material you are buying.
Can I use this calculator for a driveway, an aquarium, or to price a load?
Yes for a first estimate, but the cluster has dedicated tools that go further. Use the gravel driveway calculator for layered, compacted driveway builds; the aquarium gravel calculator for substrate depth by tank size; and the gravel cost calculator when delivery and labor drive the budget. This page is the canonical volume-and-weight estimator they all build on.
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