INCHMATE PRO Construction Calculator - Calculate and convert between feet, inches, fractions-of-an-inch, decimal feet, yards, meters, centimeters, and millimeters including square and cube. Dedicated fraction keys for direct entry with a single stroke. Calculate area, circumference, and arc length of a circle. Easily calculates board feet, cost per unit, weight per volume, temperature conversions, and much more. Features triangle calculation keys, protective case, long-lasting lithium battery with auto-off, and one-year limited warranty.