The asphalt paving calculator is for budgeting purposes. Pricing of asphalt paving is influenced by many dynamic factors. Asphalt itself is 50% of the total cost and strongly influnced by oil and gas prices (both in transportation and manufacturing).
Many contractors cut corners by laying a slimmer amount. Matching the tonage of asphalt is the consumers only way to insure a quality product. You should be able to get that information from your contractor before and after the job. Whether or not you plan to do business with TAR, just getting a quote as a second opinion may save you many heartaches down the road!