DDCalc provides a graphical user interface to do standard mathematical as well as trigonometric calculations.

DDCalc supports feet and inches as well as fractional calculations.

The command can be entered transparently in the middle of an Autodesk® AutoCAD® command by prefix with an apostrophe.

For example, when the OFFSET command is started to request an offset value, you can enter '_DDCALC to bring up the on-screen calculator to come up with an offset value.