A device for rapid hardware sizing includes a ruler-like body having a fixed end and a distal end, a fixed jaw at the fixed end, and a sliding jaw opposite the fixed jaw being slidably connected to the body such that the sliding jaw slides there along from a point immediately adjacent to the fixed jaw to the distal end. A digital logic calculation and display means is secured to the sliding jaw such that it moves along the body with the sliding jaw. A measuring means is in communication with the digital logic calculation and display means, and measures a distance between the fixed and sliding jaws. The distance is then communicated to the digital logic calculation and display means and selectively displayed thereon.A method for rapid hardware sizing includes steps of measuring a distance between fixed and sliding jaws, communicating the distance to a digital logic calculation and display means to enable it to automatically calculate and display the distance as a caliper measurement or a nut size, selectively changing between metric and British units of measurement, and displaying the distance with an indication of the corresponding selections from caliper measurement and nut size, and from metric and British units of measurement.