How do I calculate asphalt required for a driveway?

[CalchubMath]

I am trying to calculate how much asphalt is needed for a driveway.

If the length and width are known, along with the thickness, how do you correctly convert that into total asphalt weight? I know density is involved, but I’m unsure how it fits into the calculation.

Is there a standard math formula used for this kind of real-world construction problem?

 

[blamocur]

The weight is density times volume. Can you compute the volume?

 

[CalchubMath]

You’re absolutely right — the calculation is based on density multiplied by volume.


First, yes, the volume must be calculated before weight can be found.


If the driveway length and width are in feet, the thickness needs to be converted to feet as well (inches ÷ 12).


The steps are:

1. Calculate volume
   Volume = length × width × thickness
   (This gives volume in cubic feet.)
2. Apply asphalt density
   Hot mix asphalt typically has a density of about 145 lb per cubic foot (it can vary slightly by mix).

So the formula becomes:
Weight (lb) = volume (ft³) × 145

1. Convert to tons if needed
   Weight (tons) = weight (lb) ÷ 2,000

That’s the standard real-world formula used in construction estimating.


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[Ted]

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