How Many Tons of Asphalt for a 24 by 40 Driveway?

Forty feet at a twenty-four-foot width is 960 square feet. The planning math is exact at this size: 11.6 tons at two inches and 17.4 tons at three inches. People reuse 17.4 on other jobs. The plant ticket is the real weight.

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A rectangle the formula likes

The long wide rectangle is 960 square feet, 24 multiplied by 40. At two inches, 960 times 2 times 145 divided by 24,000 equals 278,400 divided by 24,000, which is 11.6 tons. At three inches, 960 times 3 times 145 divided by 24,000 equals 417,600 divided by 24,000, which is 17.4 tons. The same 17.4 appears when you multiply 960 by 0.25 foot and then by 145 and divide by 2,000. There is no rounding hiding in either depth. One inch on this driveway is 960 times 145 divided by 24,000, or 5.8 tons, and the two figures are two and three times that inch. These are planning estimates at 145 pounds per cubic foot of compacted hot mix. The plant ticket is the real weight. Because 17.4 is exact, it gets copied onto drives that are not 24 by 40. Do not let it travel.

Four more feet than a 24 by 36

A 24 by 36 drive is 864 square feet, about 15.7 tons at three inches. The extra four feet of length here are 96 square feet. At three inches, 96 times 3 times 145 divided by 24,000 equals 1.74 tons, and about 15.7 plus 1.7 lands on 17.4. At two inches that same strip is 1.16 tons, taking about 10.4 up to 11.6. If two sketches disagree by a few feet at the street, you are arguing about more than a ton at three inches. A flare beyond 24 feet of width is still more area. Average the flare widths and add that piece. Five percent of 17.4 is about 18.3 tons, and that allowance is only for minor thickness variation, not for a missed length.

Where 17.4 should stay

Use 17.4 only for 960 square feet at three compacted inches and 145 pounds per cubic foot. A different density from the plant replaces 145 and changes the product. Two lifts that add to three inches still total 17.4 if you add the lift tons once. A two-inch lift is 11.6 and a one-inch lift is 5.8. Add them and stop. Gravel base is a separate material, often planned near 1.4 tons per cubic yard, with the quarry ticket as the real stone weight. Nothing in the exactness of 17.4 makes three inches a code depth. It only means the arithmetic landed cleanly. Compare the scale tickets with the area you paved, and remeasure if the outline grew past 24 by 40.

A practical sequence

Multiply 24 by 40 to get 960 square feet.
Plan 11.6 tons at two inches or 17.4 tons at three inches.
Keep 17.4 attached to this size and this three-inch depth.
Treat both figures as a planning estimate and confirm them on the plant ticket.

The mistake to skip

Pasting 17.4 tons onto a different driveway because the number was easy to remember.

Questions people ask

Why is 17.4 tons exact?

Because 960 times 3 times 145 divided by 24,000 equals 17.4 with nothing left over. The two-inch figure, 11.6, is exact the same way. They are still planning estimates at 145 pounds per cubic foot. A different density, extra area, or thicker edges will move the plant ticket.

Does five percent turn 17.4 into a different driveway?

It turns it into about 18.3 tons on the same 960 square feet. Multiply 17.4 by 1.05. That bump is for minor thickness variation. It does not cover a wrong measurement. The scale ticket is still the amount you bought.

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