How many cubic yards in a ton of rock ?

How Many Cubic Yards in a Ton of Rock? Conversion Chart

If you are asking how many cubic yards are in a ton of rock, the short answer is about two-thirds to three-quarters of a cubic yard. Rock is sold by weight in tons but spread by volume in cubic yards, so you need a conversion before you order for a driveway, garden, landscaping bed, or drainage area. This guide gives you the formulas, a conversion chart by rock type, worked examples, and coverage figures.

Quick answer: One US short ton of typical crushed rock is approximately 0.67 to 0.80 cubic yards, depending on its bulk density. A commonly used planning estimate is about 0.71 to 0.74 cubic yards per ton for crushed stone. The exact amount varies by rock type, particle size, moisture, and supplier specifications.

Cubic yards = Tons ÷ Tons per cubic yard

Example: 5 tons ÷ 1.4 = 3.57 cubic yards.

For the most accurate result, use the density of the material you are buying. Or skip the math with the ExactYard Gravel Calculator, which converts cubic yards to tons for you.

A ton measures weight and a cubic yard measures volume

How Many Cubic Yards Are in One Ton of Rock?

For general planning, use these approximate figures. They are illustrative estimates for loose material, not guaranteed values for every supplier.

Approximate cubic yards in one ton, by rock type

Type of rock	Tons per cubic yard	Cubic yards per ton	Pounds per cubic yard
Crushed stone	1.35–1.45	0.69–0.74	2,700–2,900
Pea gravel	1.25–1.40	0.71–0.80	2,500–2,800
River rock	1.20–1.40	0.71–0.83	2,400–2,800
Crushed limestone	1.30–1.40	0.71–0.77	2,600–2,800
Decomposed granite	1.25–1.50	0.67–0.80	2,500–3,000

These ranges are indicative planning values. Actual loose bulk density varies by source, grading, particle shape, and moisture, and published figures differ between suppliers. Very light rock such as lava rock weighs far less per cubic yard than the materials above, so a ton of it fills much more space. Always confirm the density with your rock supplier before placing a large order.

How to Convert Tons of Rock to Cubic Yards

Use this formula:

Cubic yards = Tons ÷ Tons per cubic yard

Formulas to convert tons to cubic yards and back

Example: Converting 5 tons of crushed stone

The supplier gives a density of 1.4 tons per cubic yard.

5 ÷ 1.4 = 3.57 cubic yards

Example: Converting 10 tons of rock

Assume a bulk density of 1.35 tons per cubic yard.

10 ÷ 1.35 = 7.41 cubic yards

The result changes with the density you use, which is why the material specification matters when estimating deliveries.

How to Convert Cubic Yards to Tons of Rock

When you know the volume you need but the supplier sells by weight, reverse the formula:

Tons = Cubic yards × Tons per cubic yard

A project that needs 6 cubic yards of crushed stone at 1.4 tons per cubic yard needs 6 × 1.4 = 8.4 tons. Your final order should follow the supplier’s product specifications and delivery requirements.

Tons to Cubic Yards Quick Conversion Table

This table converts common ton amounts using a range of densities, from lighter rock (1.3 tons per cubic yard) to heavier rock (1.5). The middle column uses the common 1.4 planning figure.

Tons	At 1.5 t/yd³	At 1.4 t/yd³	At 1.3 t/yd³
1 ton	0.67 yd³	0.71 yd³	0.77 yd³
2 tons	1.33 yd³	1.43 yd³	1.54 yd³
5 tons	3.33 yd³	3.57 yd³	3.85 yd³
10 tons	6.67 yd³	7.14 yd³	7.69 yd³
20 tons	13.33 yd³	14.29 yd³	15.38 yd³
25 tons	16.67 yd³	17.86 yd³	19.23 yd³

How Much Does One Cubic Yard of Rock Weigh?

One cubic yard contains 27 cubic feet. How much that volume weighs depends on the material’s bulk density. If crushed stone weighs about 2,800 pounds per cubic yard, then 2,800 ÷ 2,000 = 1.4 US short tons.

A different rock may weigh more or less in the same volume, and wet material can weigh more than dry material, so the supplier’s actual density is better than a generic average. For typical weights by material, see our guide on how much a cubic yard of gravel weighs.

How Much Area Does One Ton of Rock Cover?

Coverage depends on depth. At 1.4 tons per cubic yard, one ton is about 0.71 cubic yards, or roughly 19.3 cubic feet.

Area covered by one ton of rock at different depths

Depth	Coverage per ton
2 inches	about 116 sq ft
3 inches	about 77 sq ft
4 inches	about 58 sq ft
6 inches	about 39 sq ft

Lighter or denser rock changes these numbers a little. Use your supplier’s density for a tighter estimate.

How to Calculate Rock Needed for a Landscaping Project

To estimate rock for a driveway, path, or garden bed, find the volume first, then convert to tons.

Step 1: Measure the area

For a rectangle, Area = Length × Width. A 20-foot by 10-foot area is 20 × 10 = 200 square feet. Not sure how to measure an odd shape? See how to figure out square feet.

Step 2: Choose the depth

Say you want 3 inches. Convert to feet: 3 ÷ 12 = 0.25 feet.

Step 3: Calculate cubic yards

Multiply the area by the depth in feet, then divide by 27: 200 × 0.25 ÷ 27 = 1.85 cubic yards. That is before any allowance for uneven ground or settling. You can also use how to calculate cubic yards from square feet for the same math.

Step 4: Convert the volume into tons

At 1.4 tons per cubic yard: 1.85 × 1.4 = 2.59 tons.

Worked example: rock needed for a 20 ft by 10 ft area

Building a driveway? The Driveway Gravel Calculator handles multiple layers, and our guide on how to build a gravel driveway explains the base and surface layers.

Why Does Rock Density Matter?

Density determines how much space a given weight of material occupies.

Factors that change how many tons fit in a cubic yard

Rock type: different minerals and rocks have different densities.
Particle size and shape: the gaps between pieces affect the bulk density of loose rock.
Moisture: water increases the delivered weight of aggregate.
Grading: a mix of sizes can pack differently from uniform stones.
Compaction: compacted material takes up less volume than the same material loose. Do not mix loose and compacted densities in one calculation.

These differences can noticeably affect a large order, so ask your supplier for the right bulk-density figure whenever you can.

Tips for Ordering Rock by the Ton

Know which ton you mean. In the US a ton usually means a short ton of 2,000 pounds. A metric tonne is 1,000 kilograms, about 2,205 pounds.
Ask for the supplier’s density. Many quarries sell by the ton and may not list an exact weight per yard, so confirm the figure for your product.
Check truck capacity. Loads vary by truck and material, so ask how many tons or yards a delivery carries and what the delivery charge is.
Round up. Order enough to finish the job without a second delivery fee.
Compare by the same unit. Convert quotes to cost per ton or per cubic yard before comparing suppliers.

Frequently Asked Questions

How many cubic yards are in 1 ton of rock?

About 0.67 to 0.83 cubic yards per US short ton, depending on the rock. For typical crushed stone, 0.69 to 0.74 cubic yards is a good planning figure, or roughly two-thirds to three-quarters of a cubic yard.

How many tons of rock are in 1 cubic yard?

One cubic yard of common crushed stone weighs about 1.35 to 1.45 US short tons (roughly 2,700 to 2,900 pounds). Other rock types range from about 1.2 to 1.5 tons per cubic yard, so check your product's density.

How many cubic yards are in 5 tons of rock?

At an assumed density of 1.4 tons per cubic yard, 5 tons is 5 ÷ 1.4 = 3.57 cubic yards. The result changes with the density you use.

How many cubic yards are in 10 tons of rock?

At 1.4 tons per cubic yard, 10 tons is about 7.14 cubic yards. At 1.35 tons per cubic yard it is about 7.41 cubic yards.

How many yards is 20 tons of gravel?

At 1.4 tons per cubic yard, 20 tons of gravel is about 14.3 cubic yards. Lighter pea gravel would be a little more, and denser stone a little less.

How do I convert tons to cubic yards?

Divide the tons by the material's tons per cubic yard. For example, 5 tons ÷ 1.4 tons per cubic yard = 3.57 cubic yards.

Is a ton of river rock the same volume as a ton of crushed stone?

Not necessarily. Different materials have different bulk densities and particle shapes, so the same weight can fill a different volume.

Does wet rock weigh more than dry rock?

Generally yes. Moisture adds weight, although the amount depends on the material and how much water it holds. Use the supplier's density or delivered-weight information.

How much area does 1 ton of rock cover?

At 1.4 tons per cubic yard, one ton covers roughly 116 square feet at 2 inches deep, 77 square feet at 3 inches, 58 square feet at 4 inches, and 39 square feet at 6 inches.

Is a ton the same everywhere?

In the United States, a ton usually means a short ton of 2,000 pounds. A metric tonne is 1,000 kilograms, about 2,205 pounds, so check which unit your supplier uses.

Should I order extra rock?

Measure the area and depth carefully first. If you need an allowance for waste, uneven ground, or handling, base it on your project. For compacted aggregate, follow the material and compaction specifications rather than adding a fixed percentage automatically.

Final Thoughts

Converting tons of rock into cubic yards is simple once you know the material’s bulk density. Divide the weight in tons by the tons per cubic yard to find the volume, and multiply the volume by the density to go the other way. For the best estimate, identify the exact rock type, confirm the supplier’s density, and calculate the project volume before arranging delivery.

Use the ExactYard Gravel Calculator or browse all ExactYard calculators to plan your landscaping and outdoor projects with greater confidence.