ArchCalc Construction Calculator

This is a great piece of FREEware for your computer.  We've been using handheld versions of these calculators in our office for a long time.   They are simply a "must" for doing quick dimension string checking, and for estimating materials.
This one from Stefan Hampden gives you all of the main functions of a construction calculator. It works in feet and inches, converts to metric, converts between fractions and decimal, solves trig functions and has a tape display.

It is available for:
Windows Me, Windows NT, Windows XP, Windows 2000, Windows 98
and
Windows XP / Vista and MAC!

Its free, but if you like it and use it, please pay Stefan $20 for his hard work on this...  I did!