Dear all; I must admit the lowest of low key solutions. I have an outdoor thermometer (cheap K-Mart blue light special) with temps in C and F from top to bottom. I placed the thermometer flat on the photocopier and enlarged it to fit an 8 1/2 x 11 sheet of paper. I then trimmed this to the edges of the image and keep it handy on the desk. Conversion- none- just look and move my finger across. Interesting, but the only place where C = F is at 40 below zero. No thanks. As I said lowest of low key, no math, no web site - a no brainer. Best Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 E-fax 419-781-8594 Zone 5 Record low -23F Summer 100F +