American Punch’s tonnage calculator is the easiest and most convenient way to figure out the tonnage needed to punch holes in material. We have always been known as the leader of our industry and this App is just another example of what we provide to our industries. American Punch’s tonnage calculator is the first and only App of its kind. No more awkward and out dated slide charts, no complex calculations, variables & multipliers. Designed with the machine operator, estimator and engineer in mind this convenient app turns tonnage calculations into a simple task. Simply pick your shape, fill in the dimensions, select your material thickness and hit calculate. You will retrieve results for most common materials found in structural steel applications as well as other materials commonly used in the fabrication industry.