archCalc is a Mac based mixed unit decimal and fraction calculator. It allows one to enter dimensions in standard english and metric units of measurement, perform basic calculations, convert between units, keep track of a series of operations, and take notes on results. New features include solve triangle functions, trig functions. Available for windows, os9, and mac OS X. archCalc was developed to be used in conjunction with CAD software in an architectural environment. It floats above active applications allowing one to work with it as if it were a part of the active application. archCalc works as a standalone calculator or in conjunction with other programs, calculating stair risers in CAD software, or aiding in takeoffs with a spreadsheet. archCalc floats above applications allowing one to work with it as if it were a part of the active application.