Estimating asphalt driveways is almost an art. You have to know exactly what your costs are, add in the cost of the asphalt and then put together an estimate that will not be so high that you don't get the job. Many contractors us a factoring approach. Basically, the calculate the square footage of the area to be paved, and multiply it by a set number. This number includes all of their costs,
. plus profit, and is the total cost of the job. Be careful of this method, however, because every company has a different set of expenses, so what works for one, may turn out to be a loss for another. For more examples of estimating asphalt driveways, go here: http://en.allexperts.com/q/Construction-Contractors-1093/Estimated-cost-concrete-alphalt.htm