[graarrg]

You could probably make a script to do it, but I would recommend using my ever-favorite "fraction method" instead of the ratio method.

In other words, look at the size of the pot (plus any bets out), add what you need to call to it, and then put what you need to call over that number.

Ex: $50 in the pot. Villain bets $25 to you. Thus, your pot odds are $25 divided by ($50+$25+$25), which equals 25%. You must win the pot 25% of the time or better to break even or win.

For me this works much faster than the ratio method and requires less memorization. It is also much more arithmetic-friendly.