Determine the amount of asphalt required for your project by entering its width, length, and thickness into our calculator. Our tool will then calculate the total tonnage of asphalt needed. Hot Mix Asphalt (HMA) is composed of 95% stone, sand, or gravel held together by asphalt cement, which is produced by heating the aggregate and mixing it with the cement. The resulting HMA is transported to the paving site and deposited into hoppers before being placed and compacted using a heavy roller. Once the pavement has cooled, it is ready for traffic.