How to Convert Gravel Tons to Cubic Yards (and Back)
When buying bulk gravel, the hidden trap is that volume (cubic yards) and weight (short tons) are both valid units — yet interchangeable only through the material's bulk density. A landscape supply yard may quote 6 cubic yards while a quarry quotes 8 tons for what sounds like the same project scope. Without the density bridge, you cannot confirm which offer covers the full job or compare pricing on an apples-to-apples basis. The deeper complication is that bulk density is not a fixed number: the same gravel type varies by 10–15% between a loose-dumped delivery state and a graded, compacted-in-place state — and wet aggregate from an outdoor pile can weigh 5–10% more than dry material of identical volume — so the ton price at the quarry scale may not translate cleanly into the yard price at the landscape yard.
This converter resolves that gap. Enter a quantity in short tons or cubic yards, select your material type, and the tool returns the equivalent in the opposing unit, the intermediate tons-per-cubic-yard conversion factor, and both metric and imperial results. Use this tool when you need to reconcile competing supplier quotes or verify an invoice. For calculating how much gravel a given area needs at a set depth, use the gravel calculator instead; for a full project budget that includes delivery, installation, and regional pricing, the gravel cost calculator covers unit pricing, delivery zones, and labor add-ons.
Key Features of the Gravel Tons to Yards Converter
Bi-Directional Mode Toggle
A single click switches between Tons→Yards and Yards→Tons without re-entering your quantity — built for comparing two supplier quotes in opposite units side by side.
Eight Material Density Presets
Covers crushed stone (#57), pea gravel, bank-run gravel, decomposed granite, river rock, lava rock, drainage stone (#4), and white marble chips — each with an ASTM C29 traceable bulk density value.
Custom Bulk Density Override
Enter lb/ft³ directly from your supplier's certified quarry report or your own ASTM C29 field test — useful for regional aggregates or specialty fill materials not covered by the preset list.
Tons-per-Cubic-Yard Factor Display
Surfaces the intermediate conversion ratio in the results panel so you can cross-check it against your supplier's invoice — a mismatch larger than 5% flags a density discrepancy worth querying before the order ships.
Loose vs. Compacted Density Context
Results note whether the selected preset reflects the loose-dumped delivery state or the compacted-in-place state — the primary source of weight discrepancy between quarry invoices and landscape yard quotes.
Metric Output Alongside Imperial
Returns cubic metres and metric tonnes on every result for international material orders, import/export invoicing, or when coordinating with metric-trained structural engineers.
ASTM C29 Density Traceability
All built-in density presets reference the ASTM bulk unit weight test method (ASTM C29/C29M), not informal industry averages — so every conversion has a defensible standard behind it.
Moisture Sensitivity Flag
Highlights when the selected material (pea gravel, bank-run gravel) is especially moisture-sensitive — outdoor stockpile weight can exceed the dry density preset by 5–10%, affecting volume received per paid ton.
Material Density Reference Table
An in-article table lists loose and compacted density ranges for eight gravel types with the corresponding tons/yd³ conversion factor — use it to manually spot-check any result the calculator returns.
Supplier Quote Cross-Reference Use Case
Purpose-built for the scenario where one supplier quotes by the yard and a second quotes by the ton — shows both units simultaneously so you can compare per-unit pricing without a separate spreadsheet.
Narrated 5-Ton Worked Example
A step-by-step crushed stone #57 example in the article below walks through the conversion using actual density values so you can verify the calculator's output entirely by hand.
Print / Save Conversion Summary as PDF
Generates a one-page branded PDF of all inputs and results — attach it to your RFQ, supplier email, or project file to document the density basis and quantity for the order.
How to Use the Gravel Tons to Yards Converter
- 1Choose your conversion direction. Select "Tons to Yards" if a quarry quoted you a weight and you want to know the equivalent volume, or "Yards to Tons" if your coverage calculation returned cubic yards and you need a weight for the purchase order.
- 2Enter your quantity in the input field. Type a numeric value such as 7.5 (tons) or 4.2 (cubic yards). The field accepts decimals and rejects non-numeric characters automatically.
- 3Select the gravel material type from the dropdown. The density preset updates automatically. The most common selections are Crushed Stone #57 for structural fill and drainage bases, Bank-Run Gravel for road sub-base, and Pea Gravel for decorative landscape applications.
- 4For custom materials: choose "Custom Density" from the dropdown and enter the bulk density in lb/ft³. Your supplier's certified quarry report or ASTM C29 field test results will show this value. Typical crushed stone runs 95–120 lb/ft³ depending on particle size and gradation.
- 5Click "Convert." The results panel immediately shows the converted quantity, the tons-per-cubic-yard factor used, and both US and metric equivalents.
- 6Review the Tons-per-Cubic-Yard factor displayed in the results. Divide the tons on your invoice by the yards on the same invoice — if the implied ratio differs from the calculator's factor by more than 5%, ask your supplier to confirm the density basis of their quote before the truck rolls.
- 7Consult the Material Density Reference Table in this article. Decide whether you need the loose-dumped range (material just arrived off the truck, before any compaction) or the compacted range (after grading and mechanical compaction passes) — the two differ by 10–15%.
- 8For wet or saturated outdoor stockpiles — common after rainfall — add 5–8% to your ton estimate before ordering. The dry-condition density presets will underpredict the scale weight of wet material, meaning you receive less volume per paid ton than the calculation suggests.
- 9Use the Print / Save button to export a formatted one-page PDF of your inputs and results for the project file, supplier email, or purchase order documentation.
- 10For the full area coverage calculation — how many cubic yards a project requires given length, width, and depth — follow the cross-link in the results panel to the gravel calculator.
Formulas Used in the Converter
- 1) Tons per cubic yard from lb/ft³Tons/yd³ = (Density lb/ft³ × 27) ÷ 2,000
1 cubic yard = 27 cubic feet; 1 US short ton = 2,000 lb. Multiplying density by 27 gives the weight of one cubic yard in pounds; dividing by 2,000 converts pounds to tons. - 2) Tons to cubic yardsCubic yards = Tons ÷ (Tons/yd³)
Divide the weight quantity by the density ratio to get volume. Example: 5 tons ÷ 1.35 tons/yd³ = 3.70 yd³. - 3) Cubic yards to tonsTons = Cubic yards × (Tons/yd³)
Multiply volume by the density ratio to get weight. Example: 4 yd³ × 1.35 tons/yd³ = 5.40 tons. - 4) Metric equivalentsCubic metres = Cubic yards × 0.7646 | Metric tonnes = Short tons × 0.9072
Applied after the US-unit conversion to support international orders or metric-based project specifications.
Narrated Worked Example — 5 Tons of Crushed Stone #57
You need to order 5 short tons of crushed stone #57 for a driveway sub-base and want to confirm how many cubic yards will arrive on the delivery truck.
Step 1 — Identify the bulk density. Crushed stone #57 (¾ in clean-washed angular stone) has a loose bulk density of approximately 100 lb/ft³ per ASTM C29 field tests. Your supplier's certified quarry report should show a value in the 95–110 lb/ft³ range, depending on the specific source quarry and gradation.
Step 2 — Derive the tons-per-cubic-yard factor. (100 lb/ft³ × 27 ft³/yd³) ÷ 2,000 lb/ton = 2,700 ÷ 2,000 = 1.35 tons per cubic yard (loose delivery state).
Step 3 — Convert tons to yards. 5 tons ÷ 1.35 tons/yd³ = 3.70 cubic yards.
Step 4 — Cross-check the result. A standard single-axle dump truck holds roughly 10–14 cubic yards, so 3.70 yd³ is well under one full load. Now suppose a second supplier quotes the same job as 4.0 cubic yards instead of 3.70. Working backward: 4.0 × 1.35 = 5.4 implied tons — an 8% premium over the first quote. That gap falls within the normal loose-to-dense density spread for crushed stone and is not alarming. A discrepancy above 20% would suggest that one supplier is using a different density basis or a different material size class, and is worth querying explicitly before committing the order.
Material Density Reference — Loose vs. Compacted
The table below lists typical bulk density ranges for eight common gravel and aggregate types in both loose-dumped and compacted states, with the corresponding tons-per-cubic-yard conversion factor for each. Use the loose column when estimating a fresh delivery before any compaction work; use the compacted column when specifying structural fill that will be measured in-place after mechanical compaction. For coverage and volume estimates starting from area dimensions, the gravel calculator uses these same density values automatically.
| Material | Loose (lb/ft³) | Compacted (lb/ft³) | Loose (tons/yd³) | Compacted (tons/yd³) |
|---|---|---|---|---|
| Crushed Stone #57 (¾ in) | 95–105 | 105–120 | 1.28–1.42 | 1.42–1.62 |
| Pea Gravel (⅜ in) | 88–102 | 100–112 | 1.19–1.38 | 1.35–1.51 |
| Bank-Run Gravel | 100–110 | 110–125 | 1.35–1.49 | 1.49–1.69 |
| Decomposed Granite | 80–95 | 92–108 | 1.08–1.28 | 1.24–1.46 |
| River Rock (rounded) | 80–95 | 90–105 | 1.08–1.28 | 1.22–1.42 |
| Lava Rock (scoria) | 48–62 | 58–72 | 0.65–0.84 | 0.78–0.97 |
| Drainage Stone #4 | 88–100 | 98–110 | 1.19–1.35 | 1.32–1.49 |
| White Marble Chips | 68–80 | 78–90 | 0.92–1.08 | 1.05–1.22 |
Density ranges based on ASTM C29/C29M bulk unit weight tests. Actual values vary by particle size distribution, angularity, and moisture content. Obtain a certified test report from your supplier for structural specification or drainage design work.
Common Mistakes When Converting Gravel Tons to Yards
Quarry trucks are weighed in their loose, agitated state — not in the denser compacted-in-place state. Using the compacted density value underestimates the volume you will receive per ton by 10–15%. Always use the loose density column when estimating a fresh bulk delivery, and switch to compacted only when checking in-place structural fill after compaction.
US quarries quote in short tons (2,000 lb). UK and many international suppliers use metric tonnes (2,204.6 lb, roughly 10% heavier than a short ton). Using the wrong ton type creates a systematic 10% ordering error on every conversion — on a 50-ton order that is half a cubic yard off per conversion. Always confirm the ton type on the supplier's invoice or quote sheet before entering the value.
Pea gravel at ~95 lb/ft³ is 10–15% lighter per cubic yard than crushed stone at ~105 lb/ft³; lava rock (scoria) at ~55 lb/ft³ is nearly half the density of crushed stone. Substituting the wrong density produces conversion errors that scale with project size. Always select the specific material preset or enter the actual bulk density. The pea gravel calculator uses the correct pea-gravel bulk density and adds coverage and bag-count outputs on top.
Aggregate stored outdoors absorbs rainwater, and the scale weight at pickup includes that moisture. An outdoor stockpile of bank-run gravel can weigh 8–12% more than its dry bulk density suggests — meaning you receive less volume per paid ton than the calculator's dry-condition preset implies. If the stockpile is visibly wet or was recently rained on, add 8–10% to your ton quantity to ensure you order enough net volume for the project.
Standards & References
The foundational measurement that links volume (cubic yards) to weight (tons) for all aggregate types. All preset bulk densities in this calculator are derived from ASTM C29 bulk unit weight test results — the same test method your supplier uses to produce a certified density report.
Defines the aggregate size designations (#57, #4, #3, etc.) referenced in this calculator's material presets. The size class determines particle grading and surface texture, which directly affects bulk density and therefore the tons-per-cubic-yard conversion factor for each preset.
AASHTO's equivalent to ASTM C29, referenced in state DOT specifications and highway construction contracts. When your supplier provides AASHTO T 19 density data, it is directly compatible with this calculator — the two test procedures produce equivalent bulk density values.
Bulk density values are typical dry-condition ranges. Actual delivered weight may differ due to moisture content, aggregate gradation, and local quarry conditions. Verify bulk density with your supplier's certified test report for structural fill or drainage specification work.
Frequently Asked Questions
What is a gravel tons to yards converter, and why do I need one?
A gravel tons to yards converter translates between weight (short tons) and volume (cubic yards) using the material's bulk density as the bridge. You need it because landscape supply yards often quote by the cubic yard while quarries quote by the ton. Without knowing the density, you cannot compare the two prices or confirm both quotes cover the same amount of material for your project.
How many tons are in 1 cubic yard of gravel?
It depends on the material. Standard crushed stone #57 weighs approximately 1.28–1.42 tons per cubic yard (loose delivery state); bank-run gravel runs 1.35–1.49 tons/yd³; pea gravel comes in at 1.19–1.38 tons/yd³; and lava rock (scoria) is as light as 0.65–0.84 tons/yd³. The commonly cited rule of thumb of "1.4 tons per cubic yard" reflects average crushed stone and will significantly overestimate weight for lighter decorative stones like lava rock or white marble chips.
How many cubic yards is 10 tons of bank-run gravel?
Bank-run gravel has a loose bulk density of approximately 100–110 lb/ft³, giving a conversion factor of 1.35–1.49 tons/yd³. Using the midpoint of 1.42 tons/yd³: 10 tons ÷ 1.42 = 7.04 cubic yards. At the loose end (1.35 tons/yd³) you would receive 7.41 yards; at the dense end (1.49) you would receive 6.71 yards. The ±5% spread is why it pays to request the actual ASTM C29 density from your supplier before finalizing a large order.
How many tons is 5 cubic yards of pea gravel?
Pea gravel has a typical loose bulk density of 88–102 lb/ft³, giving 1.19–1.38 tons/yd³. Using the midpoint of 1.28 tons/yd³: 5 cubic yards × 1.28 = 6.4 tons. If ordering from a quarry that weighs trucks, expect to pay for 6.0–6.9 tons depending on the actual particle density and moisture content of the stockpile on the day of pickup.
Why does the conversion factor differ between gravel types?
Bulk density depends on particle size, shape (angular vs. rounded), surface texture, and the amount of void space between particles. Angular crushed stone particles interlock and pack more tightly, producing a higher density. Smooth, rounded river rock and pea gravel leave more void space, producing a lower density. Lightweight volcanic materials like lava rock have high internal porosity, reducing the solid mass per unit volume dramatically — which is why lava rock at 0.65–0.84 tons/yd³ is roughly half the density of crushed stone.
Does wet gravel weigh more per cubic yard than dry gravel?
Yes — sometimes significantly. Water fills void space between aggregate particles. For a hygroscopic material like bank-run gravel, moisture content can add 5–12% to the scale weight compared to the dry bulk density. If your supplier's outdoor stockpile was exposed to recent rain, ask for a moisture-corrected density or add 8–10% to your ton quantity to ensure you receive the expected cubic yardage on delivery.
What is the difference between a short ton, long ton, and metric tonne for gravel orders?
A US short ton = 2,000 lb; a UK long ton = 2,240 lb; a metric tonne = 2,204.6 lb. Most US quarries and landscape suppliers quote in short tons. If you are ordering from an international supplier or working with a metric specification, confirm the ton type on the invoice before entering the value. Using metric tonnes in a short-ton formula overstates the weight by approximately 10%, which compounds into a 10% volume error on every single conversion.
How do I find the bulk density of a gravel not on the preset list?
Request a certified material test report (quarry report) from your supplier — it must include ASTM C29 or AASHTO T 19 bulk unit weight results in lb/ft³ or kg/m³. If no lab report is available, select the closest preset as a starting estimate (crushed stone for angular aggregates, river rock for smooth rounded stone), then verify with the supplier before finalizing the order. The custom density field lets you enter the exact lb/ft³ value once you have it.
What is the difference between loose bulk density and compacted density, and which should I use?
Loose bulk density is the weight per cubic foot of freshly dumped, uncompacted aggregate — what a delivery truck delivers. Compacted bulk density is the weight after mechanical compaction (vibratory plate, roller, or hand tamper), which eliminates voids and increases density by 10–15%. Use the loose density when estimating delivery quantity. Use the compacted density when checking in-place fill compliance on a structural specification or calculating post-compaction volume in a trench or road subbase.
My quarry quoted 5 tons, but my landscape yard quoted 3.8 cubic yards for the same project. Are these consistent?
Check the implied conversion factor: 5 tons ÷ 3.8 yards = 1.32 tons/yd³. That falls squarely in the loose crushed stone range (1.28–1.42 tons/yd³), so the two quotes are consistent. If the implied factor were above 1.62 or below 1.08 for standard crushed stone, it would signal that one supplier is using an unusual density basis, a different material, or a different aggregate size class — worth clarifying before the order is placed.
Can I use this calculator for decomposed granite or lava rock?
Yes. Select the "Decomposed Granite" preset, which applies a loose bulk density of 80–95 lb/ft³ (1.08–1.28 tons/yd³), or the "Lava Rock" preset at 48–62 lb/ft³ (0.65–0.84 tons/yd³). Both materials are commonly sold by the ton in the US and require material-specific densities for an accurate conversion. Decomposed granite is notably lighter than crushed stone, so a project quoted at the crushed stone density would significantly underestimate the volume delivered.
What is ASTM C29, and why does it matter for gravel conversions?
ASTM C29/C29M is the Standard Test Method for Bulk Density and Voids in Aggregate published by ASTM International. It defines a precise, reproducible procedure for measuring how much a cubic foot of aggregate weighs in a loose or rodded state. The test result — expressed in lb/ft³ — is the density input that drives every tons-to-yards conversion. When a supplier's quarry report cites an ASTM C29 bulk density, it means the conversion factor is backed by a laboratory-measured value rather than a general industry average.
How does the gravel tons-to-yards converter differ from the gravel calculator?
This converter does one specific thing: translate a known quantity between tons and cubic yards using bulk density. The gravel calculator starts from project dimensions (length × width × depth) and calculates how much material the project requires from scratch — returning volume in cubic yards and cubic feet, weight in tons, bag count, and optional cost. Use this converter when you already have a supplier quantity and need it in the other unit; use the gravel calculator when you are sizing the project from physical dimensions.
Is this calculator free to use?
Yes. The gravel tons to yards converter is completely free with no account, no registration, and no usage limits. All calculations run client-side in your browser — your project data is never sent to a server or stored anywhere.
Can I print or save my conversion result?
Yes. Click the Print / Save button in the results panel after running a conversion. A formatted one-page summary opens in a new browser tab, showing your inputs, the converted result, and the tons-per-cubic-yard factor used. In your browser's print dialog, choose "Save as PDF" to keep a digital copy for your project file, purchase order, or supplier communication.
What does 'tons per cubic yard' mean, and how is it different from lb/ft³?
Both express the same physical property — bulk density — in different scale units. lb/ft³ (pounds per cubic foot) is the laboratory measurement standard per ASTM C29. Tons per cubic yard is the practical purchasing unit for US bulk material orders. The conversion between them is: tons/yd³ = (lb/ft³ × 27) ÷ 2,000. A material at 100 lb/ft³ equals exactly 1.35 tons/yd³. The calculator uses lb/ft³ internally and displays tons/yd³ in the results because that is the unit suppliers and contractors use on invoices and purchase orders.
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