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AutoCAD Tips & TutorialsLet AutoCAD do the mathThere are several ways you can let AutoCAD do some quick arithmetic for you when you need a distance. Let's say you're drawing a line and you want to use direct distance entry to specify the length. What you know is that that line should be 4.372 plus 3.925. Of course, you could use a hand calculator or (gasp!) take out a pencil and paper and do the math. Use an AutoLISP expression Tony Dakin suggested the following method, which uses an AutoLISP expression. At the Specify next point or [Undo]: prompt, enter the following: (+ 4.372 3.925)
Use the CAL command There's another way: you can use the old CAL command. Here's how: At the Specify next point or [Undo]: prompt, enter 'cal and press Enter. At the >>>> Expression: prompt, simply enter 4.372 + 3.925 and press Enter. Enter math expressions in dialog box text boxes and the Properties palette Did you know that you can enter expressions in dialog boxes and the Properties palette? Just type the expression, such as 4.372+3.925 and press Alt-Enter (don't forget to press the Alt key!) You may have to press Enter to complete the change. For example, you can use this method to change the radius of a circle in the Properties palette.
For this to work, the CALCINPUT system variable must be set at 1, which is the default setting. Related tips:
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