Gravel Yards to Tonnes: How to Convert

To convert cubic yards of gravel to tonnes (metric tons), multiply the volume in cubic yards by the density of the gravel in tonnes per cubic yard. For typical dry gravel with a density of about 1.4 tonnes per cubic yard, 1 cubic yard equals approximately 1.4 tonnes.

Formula

The conversion uses a simple multiplication:

Tonnes = Cubic yards × Density (tonnes per cubic yard)

Where:

• Cubic yards (yd³) – the volume of gravel you have or need.
• Density (tonnes/yd³) – how heavy one cubic yard of the specific gravel is. This varies with material type and moisture.
• Tonnes (t) – the resulting mass, also called metric tons (1 tonne = 1,000 kg).

Worked Example

Using the default values from the calculator (1 cubic yard, density 1.4 tonnes/yd³):

1. Start with volume: 1 yd³
2. Multiply by density: 1 × 1.4 = 1.4
3. Result: 1.4 tonnes

So 1 cubic yard of that gravel weighs 1.4 tonnes. If you had 3 cubic yards, it would be 3 × 1.4 = 4.2 tonnes.

Why Density Matters

Gravel is not a single uniform material. The density depends on the rock type, particle size, and how tightly it is packed. Common values range from about 1.3 to 1.7 tonnes per cubic yard. For example:

• Loose, dry gravel (pea gravel): ~1.3–1.4 t/yd³
• Crushed stone (e.g., #57 limestone): ~1.4–1.5 t/yd³
• Wet gravel or sand-gravel mix: ~1.6–1.7 t/yd³

If you don’t know the exact density, 1.4 t/yd³ is a reasonable average for dry gravel. For wet or compacted material, use a higher value.

How to Use the Calculator

Enter the volume in cubic yards and the density in tonnes per cubic yard. The calculator returns the mass in tonnes. If you have the opposite situation – you know the tonnes and need cubic yards – divide the tonnes by the density. For example, 5 tonnes ÷ 1.4 t/yd³ = 3.57 yd³.

This calculator is useful for ordering gravel for driveways, paths, or landscaping. Suppliers often quote in tonnes, but you may plan in cubic yards based on the area and depth you want to cover.

Common Mistakes and Pitfalls

• Using the wrong density – assuming all gravel weighs the same can lead to over- or under-ordering. Always ask your supplier for the density of the specific material.
• Mixing units – this calculator works in cubic yards and tonnes. If you measure in cubic feet or kilograms, convert first (1 yd³ = 27 ft³, 1 tonne = 1,000 kg).
• Ignoring moisture – wet gravel is heavier. If the material has been sitting in rain, add 5–10% to the density.
• Rounding too early – keep at least two decimal places during the calculation to avoid significant errors when ordering large volumes.

Limits of the Formula

The formula is linear and assumes uniform density throughout the gravel. In reality, a pile of gravel has voids – air spaces between stones – so the bulk density is lower than the density of the rock itself. The values used here are bulk densities, which already account for voids. If you need extreme accuracy (e.g., for engineering), measure the density of your actual sample or use a certified value from the supplier.

Also, the calculator gives mass in tonnes, but some regions use short tons (2,000 lb) or long tons (2,240 lb). This calculator uses the metric tonne (1,000 kg). To convert to short tons, multiply tonnes by 1.10231.

Frequently Asked Questions

How many tonnes is 1 cubic yard of gravel?

With a typical density of 1.4 tonnes per cubic yard, 1 cubic yard equals 1.4 tonnes. For lighter gravel like pea gravel, it might be 1.3 tonnes; for crushed stone, it could be 1.5 tonnes or more.

How do I convert tonnes to cubic yards for gravel?

Divide the weight in tonnes by the density in tonnes per cubic yard. For example, 2 tonnes ÷ 1.4 t/yd³ = 1.43 cubic yards.

What is the density of gravel in kg/m³?

Typical dry gravel has a bulk density of about 1,680 kg/m³ (which is 1.68 t/m³). To convert to tonnes per cubic yard, multiply by 0.7646 (since 1 yd³ = 0.7646 m³). So 1.68 × 0.7646 ≈ 1.28 t/yd³ – but this varies. Always check with your supplier.

Why does wet gravel weigh more?

Water fills the voids between stones and adds mass without increasing volume. Wet gravel can be 5–10% heavier than dry gravel, so if you’re ordering by weight, you might get less volume than expected on a wet day.

Can I use this calculator for other materials like sand or soil?

Yes, the same formula works for any bulk material. Just change the density to match the material. For example, dry sand is about 1.4 t/yd³, while topsoil is around 1.1 t/yd³.

How much area does 1 tonne of gravel cover?

It depends on depth. At a depth of 2 inches (5 cm), 1 tonne of gravel (1.4 t/yd³) covers about 18 square yards (15 m²). For a 4-inch depth, it covers about 9 square yards (7.5 m²).

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in cy | Cubic yards | yd³ | 1 | 0
in d | Density | tonnes/yd³ | 1.4 | 0
out t | Tonnes | t | cy * d | 2