Hi, Stummel, and welcome to the board! Many are using the software...like EQ and similars...I still like old fashioned graph paper, pencils, erasers, and ruler....depending on the time of day and blood sugar levels, I may use a calculator for the math...but it's just simple arithmetic, really...lol. Do a very rough sketch and then take it to the graph paper...make it look like what you want...then do the arithmetic..quite an exericise in getting familiar with how it really works, huh?