Gravel Calculator: Tons to Cubic Yards

This gravel calculator converts between tons and cubic yards based on the density of the material you are using. Enter the amount in tons (or cubic yards), select the gravel type, and the calculator returns the equivalent volume (or weight) along with the estimated coverage area at your chosen depth.

Formula

The conversion from tons to cubic yards uses the density of the gravel. Density varies with the type and moisture content of the material. The basic formula is:

Cubic yards = (Tons × 2000) ÷ (Density in lb/ft³ × 27)

Where:

• Tons = weight of gravel in short tons (US tons, 2000 lb each)
• Density = mass per unit volume of the gravel, in pounds per cubic foot (lb/ft³). Common values: pea gravel ≈ 1.68 t/yd³ (≈ 95 lb/ft³), crushed stone ≈ 1.6 t/yd³ (≈ 100 lb/ft³), bank run ≈ 1.9 t/yd³ (≈ 115 lb/ft³), limestone ≈ 2.0 t/yd³ (≈ 125 lb/ft³), river rock ≈ 1.4 t/yd³ (≈ 85 lb/ft³).
• 27 = number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft).

Note that the density is often given in tons per cubic yard (t/yd³). In that case, the formula simplifies to: Cubic yards = Tons ÷ Density (t/yd³). The calculator uses the 2000/27 conversion internally, but the result is the same.

Worked Example

Using the calculator defaults: 5 tons of pea gravel (density 1.68 t/yd³) at a depth of 4 inches.

1. Convert tons to pounds: 5 × 2000 = 10,000 lb.
2. Convert density to lb/ft³: 1.68 t/yd³ × (2000/27) ≈ 124.4 lb/ft³.
3. Calculate volume in cubic feet: 10,000 ÷ 124.4 ≈ 80.4 ft³.
4. Convert to cubic yards: 80.4 ÷ 27 ≈ 2.98 yd³.
5. Area covered = (2.98 × 27) ÷ (4/12) = 80.4 ÷ 0.333 ≈ 241 ft².

The calculator shows 2.98 cubic yards and 241 square feet covered at 4 inches deep.

Why Density Matters

Gravel is not a single material. It is a broad category that includes crushed stone, pea gravel, river rock, bank run, and recycled concrete, each with a different density. Density is typically measured in pounds per cubic foot (lb/ft³) or tons per cubic yard (t/yd³). For example, dry crushed stone has a density around 100 lb/ft³ (1.6 t/yd³), while wet or compacted gravel can be 10–15% heavier. Using a generic density of 1.4 t/yd³ when your gravel is actually 1.8 t/yd³ will underestimate the volume you need by about 20%, leading to a shortfall on the job.

Moisture content also plays a role. Freshly dug gravel that has been exposed to rain can weigh more than dry gravel. The difference is usually small (a few percent), but for large projects it can mean an extra ton or two. The calculator uses typical dry densities; if your gravel is wet, add 5–10% to the weight or reduce the estimated volume accordingly.

How to Measure and Estimate

To get an accurate conversion, you need to know the density of the specific gravel you plan to use. You can find this from the supplier, or use the average values in the calculator. If you are unsure, a mid-range density of 1.6 t/yd³ (crushed stone) is a safe starting point for most projects.

To estimate how much gravel you need for a project:

• Measure the length and width of the area in feet.
• Decide the depth in inches (commonly 2–4 inches for pathways, 4–6 inches for driveways).
• Calculate cubic feet: length × width × (depth/12).
• Divide by 27 to get cubic yards.
• Multiply cubic yards by the density (t/yd³) to get tons.

For example, a 10 ft × 10 ft area at 3 inches deep is 10×10×(3/12) = 25 ft³, which is 0.93 yd³. At 1.6 t/yd³, that is about 1.5 tons.

Common Mistakes and Pitfalls

The most frequent error is mixing up short tons (2000 lb) and metric tons (1000 kg ≈ 2205 lb). The calculator uses short tons, which are standard in the US. If your supplier quotes metric tons, multiply by 1.102 to get short tons.

Another mistake is using the wrong density. Many online sources list gravel density as 1.4 t/yd³, which is for loose river rock, not crushed stone. Always verify the density for your specific material.

Rounding too early can also cause problems. If you round the volume to the nearest cubic yard before ordering, you might end up with too little or too much. It is better to order 10–15% extra to account for compaction, spreading losses, and uneven ground.

Finally, remember that cubic yards measure volume, not weight. A yard of gravel can weigh anywhere from 1.4 to 2.0 tons depending on the type. Never assume a fixed weight per yard.

How to Choose the Right Gravel

The type of gravel you choose affects both the density and the suitability for your project. Here are common options:

• Pea gravel – small, rounded stones, good for paths and playgrounds. Density ≈ 1.68 t/yd³.
• Crushed stone – angular, jagged pieces, ideal for driveways and base layers. Density ≈ 1.6 t/yd³.
• Bank run – a mix of sand and gravel, often used as a base. Density ≈ 1.9 t/yd³.
• Limestone – crushed limestone, common for driveways and drainage. Density ≈ 2.0 t/yd³.
• River rock – smooth, rounded stones, used for landscaping. Density ≈ 1.4 t/yd³.

For a driveway, crushed stone or limestone is better because the angular pieces lock together. For a decorative path, pea gravel or river rock is more comfortable to walk on. The density difference of 0.6 t/yd³ between river rock and limestone means a significant difference in weight for the same volume, so the conversion is not just a math exercise—it affects your order size.

Cost and Ordering Considerations

Gravel is sold by the ton or by the cubic yard, depending on the supplier. If you order by the ton, you need to know the volume you need. If you order by the cubic yard, you need to know the weight for delivery limits. Most dump trucks can carry 10–14 tons, which is roughly 6–9 cubic yards of gravel. Knowing both numbers helps you plan delivery and avoid overloading the truck or your driveway.

Bulk orders are usually cheaper per ton, but you may be charged a delivery fee. Some suppliers have a minimum order (e.g., 1 ton). It is always wise to ask for the density of the specific gravel they sell, as it can vary from the average.

Safety and Accuracy Tips

When working with gravel, always wear eye protection and gloves when handling or spreading it. Use a wheelbarrow and shovel to move small amounts, and consider a mechanical spreader for large areas. For driveways, compact the gravel properly to avoid shifting.

For accurate measurements, use a tape measure and measure twice. If the area is irregular, break it into rectangles and add the volumes. When ordering, add 10–15% extra to account for compaction and waste. Never stand on a pile of gravel—it can shift and cause falls.

Also, be aware that the calculator gives an estimate. Actual density varies with moisture and compaction, so always confirm with your supplier if precision is critical.

Frequently Asked Questions

How many cubic yards are in a ton of gravel?

It depends on the gravel density. For average crushed stone (1.6 t/yd³), 1 ton equals about 0.63 cubic yards. For pea gravel (1.68 t/yd³), it is about 0.60 cubic yards. Use the formula: cubic yards = tons × 2000 / (density in lb/ft³ × 27).

Can I convert cubic yards to tons the same way?

Yes, just reverse the formula: tons = cubic yards × density (t/yd³). For example, 2 cubic yards of limestone at 2.0 t/yd³ equals 4 tons. The calculator can handle this if you input the volume, but the current version takes tons as input; you can use the formula manually.

Why does my gravel supplier use tons instead of cubic yards?

Because weight is easier to measure accurately on a scale, and gravel is sold by weight to avoid disputes over volume. However, you need to know the volume for coverage, so the conversion is essential.

What is the difference between a short ton and a metric ton?

A short ton (US ton) is 2000 pounds, while a metric ton (tonne) is 1000 kilograms, about 2205 pounds. The difference is about 10%, so using the wrong ton can cause a significant error in your order.

How much gravel do I need for a 10×10 area?

At 3 inches deep, you need about 0.93 cubic yards, which is roughly 1.5 tons of crushed stone. At 4 inches deep, it is about 1.23 cubic yards, or about 2 tons. Use the area formula to adjust for your depth.

Is it better to order by the ton or by the cubic yard?

Order by the unit that is cheaper per yard equivalent, but also consider delivery limits. If you know the density, you can compare prices. For most projects, ordering by the ton is common because suppliers weigh trucks easily.

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in tons | Tons of gravel | tons | 5 | 0
sel type | Gravel type | Pea gravel=1.68, Crushed stone=1.6, Bank run=1.9, Limestone=2.0, River rock=1.4
in depth_in | Depth | in | 4 | 0
out cy | Cubic yards | yd³ | tons * 2000 / (type * 27) | 2
out area_sqft | Area covered | ft² | (cy * 27) / (depth_in / 12) | 0