How Many Tons of Asphalt for a 16 by 40 Driveway?

Stretching a sixteen-foot drive to forty feet makes 640 square feet. Plan about 7.7 tons at two inches and about 11.6 tons at three inches. The extra ten feet of length versus a thirty-foot drive is real tonnage. The plant ticket is the real weight.

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Length is the change from the shorter twin

Sixteen by forty is the same width as a 16 by 30 drive with ten more feet of run. Sixteen times 40 is 640 square feet. At two inches, 640 times 2 times 145 divided by 24,000 equals 185,600 divided by 24,000, which is 7.733, about 7.7 tons. At three inches, 640 times 3 times 145 divided by 24,000 equals 278,400 divided by 24,000, which is 11.6 tons. The extra ten feet are 16 times 10, or 160 square feet. At three inches that strip is 160 times 3 times 145 divided by 24,000, exactly 2.9 tons. That is the gap between about 8.7 tons on the shorter drive and 11.6 here. These are planning estimates at 145 pounds per cubic foot. The plant ticket is the real weight.

Do not stop the tape at the garage

Forty feet is a planning length, not a guess you should round down to thirty because thirty was easier. If the pavement starts at the street and ends at the garage, measure that full distance, including the apron. If part of the forty feet is an existing walk you are not paving, leave it out. A flare beyond the sixteen-foot width is still extra area. Average its ends and add it. Hand-placed edges along forty feet have more length in which to run thick, so yield can sit above 7.7 or 11.6. Five percent of 11.6 is about 0.6 ton. That is a minor-variation allowance, not a cover for a ten-foot measuring miss, which we already saw is nearly 3 tons at three inches.

Two lifts still total the same tons

If the three-inch mat is placed as a two-inch course and a one-inch course, compute each or just keep 11.6. One inch on 640 square feet is 640 times 145 divided by 24,000, about 3.87 tons. Two inches is about 7.7. Add about 3.9 and 7.7 and you are back near 11.6. Do not order 11.6 plus both lifts. The base under the asphalt is not in these numbers. Plan gravel near 1.4 tons per cubic yard if you are ordering stone, and let the quarry ticket be the real stone weight. Nothing here sets a price or a code thickness. Soil and traffic decide the section. The formula only weighs the hot mix you described.

A practical sequence

Multiply 16 by 40 to get 640 square feet.
Plan about 7.7 tons at two inches or 11.6 tons at three inches.
Add about 2.9 tons at three inches if the drive is ten feet longer than a 16 by 30.
Treat the order as a planning estimate and confirm it on the plant ticket.

The mistake to skip

Using the thirty-foot tonnage after the tape shows a forty-foot length.

Questions people ask

How many tons is 16 by 40 at three inches?

11.6 tons in the planning math. The area is 640 square feet, and 640 times 3 times 145 divided by 24,000 equals 11.6. About 7.7 tons is the two-inch figure. Both assume 145 pounds per cubic foot of compacted hot mix. The plant ticket is the real weight.

What does ten extra feet weigh?

At a sixteen-foot width, ten feet of length is 160 square feet. At three inches that is 2.9 tons. At two inches it is about 1.9 tons. Add that slice to a 16 by 30 estimate instead of hoping the shorter number still fits.

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