Tons of Asphalt per Square Yard per Inch: The 110-Pound Rule

One square yard of compacted hot mix, 1 inch thick, weighs about 109 pounds. Most estimators round that to 110, and the "110-pound rule" is simply that rounded number put to work. Multiply square yards by inches of thickness by 110, divide by 2,000, and you have tons. It's quick, it's close, and it's the shortcut you'll see on bid sheets, commercial takeoffs, and plenty of online calculators.

Asphalt tonnage calculator → Tons for a driveway →

Where the 110 Comes From

It all starts with the standard density for compacted hot mix: 145 pounds per cubic foot.

• Each side of a square yard measures 3 feet, so it covers 9 square feet.
• At 1 inch thick (1/12 of a foot), that's 9 ÷ 12 = 0.75 cubic feet.
• 0.75 × 145 = 108.75 pounds.

So the honest figure is about 109 pounds. Rounding up to 110 makes the mental math easier and adds a sliver of cushion. GetAsphaltCalculator walks through this exact derivation and says the industry rounds the 109 to 110. Billd's asphalt calculator and the takeoff glossary at Ruh AI both use 110 as their working number.

The Formula

Tons = square yards × inches × 110 ÷ 2,000

If you'd rather use the unrounded figure, swap 110 for 109. For a job measured in square feet, divide by 9 first to get square yards.

Example: a 500-square-yard lot paved 3 inches thick.

• With 110: 500 × 3 × 110 ÷ 2,000 = 82.5 tons
• With 109: 500 × 3 × 109 ÷ 2,000 = about 81.8 tons

That's a gap of three-quarters of a ton on a fair-sized job. On a home driveway the difference is a few hundred pounds at most.

Tons of Asphalt per Square Yard Inch: Quick Table

Using 109 pounds per square yard per inch:

Compacted thickness	Pounds per sq yd	Tons per sq yd	Sq yd covered by 1 ton
1 inch	109	About 0.055	About 18.3
1.5 inches	About 164	About 0.082	About 12.2
2 inches	218	About 0.109	About 9.2
2.5 inches	About 273	About 0.136	About 7.3
3 inches	327	About 0.164	About 6.1
4 inches	436	0.218	About 4.6

To use the table, find your thickness, multiply the tons-per-square-yard figure by your area, and add 5 to 10 percent for waste.

Running It Backward

Sometimes you know the tonnage and want the area. Maybe your budget caps the order at a set number of tons. Flip the formula:

Square yards = tons × 2,000 ÷ (109 × inches)

Twenty tons at 2 inches covers about 40,000 ÷ 218 = 183 square yards, or roughly 1,650 square feet. That's about a 20-by-80-foot two-car driveway.

When the Rule Misleads

The shortcut assumes ordinary dense-graded hot mix. It drifts in a few situations:

• Open-graded or porous mixes. These have lots of air space by design. Asphalt magazine reports that the Indiana Department of Transportation (INDOT) figures 100 pounds per square yard per inch for its open-graded drainage layers, and the Tennessee Department of Transportation (TDOT) uses 88 for its open-graded friction course mixes. Both sit well under 110.
• Heavier aggregates. Some regions use dense trap rock or slag. At 150 pounds per cubic foot, a square yard at 1 inch climbs to about 112.5 pounds.
• Millings. Compacted millings at the 115-pound midpoint work out to roughly 86 pounds per square yard per inch. Don't use 110 for recycled material.
• Loose measurements. The rule applies to compacted thickness. If you measure the loose mat behind the paver, you'll overshoot.

When a plant gives you a specific density for its mix, plug that in. Multiply the density by 0.75 and you have your own custom per-square-yard-inch figure.

Why "Per Inch" Means Finished Inches

Every inch in this rule is a compacted inch, measured after the roller is done. A 3-inch driveway is often placed in two lifts, such as a thicker bottom layer and a thinner top layer, but the tonnage math doesn't care. Add the lifts together and run the formula once, or figure each lift on its own and add the tons. You'll land in the same place.

The loose mat the paver lays is thicker than the finished inch, which is covered in asphalt compaction factor explained.

Square Feet Instead?

Most homeowners measure in feet, not yards. You can convert first (divide square feet by 9), or use a calculator that handles it for you. The driveway asphalt calculator takes length, width, and depth in feet and inches. For more worked examples at different sizes, the blacktop tonnage walkthrough lays them out side by side.

If you think in cubic yards instead, see asphalt weight per cubic yard.

Budgeting From the Tonnage

Once you have tons, cost follows. As a rough planning range we use $90 to $130 per ton of hot mix, but local prices vary by region and season, and hauling is extra, so get quotes and run them through our cost per ton calculator. Labor, base work, and equipment usually make up much of the total, so your tonnage estimate is only one line on the quote. Ask each contractor to list the tons they're figuring so you can compare bids fairly.

Bottom Line on the 110-Pound Rule

The 110-pound rule says one square yard of asphalt, 1 inch thick, weighs about 110 pounds, a rounded version of the true 109. Multiply square yards by inches and by that figure, divide by 2,000, and add a little for waste. For special mixes or millings, adjust the number instead of trusting the shortcut.