A calculator app for a role playing game.

I was inspired by the Treehouse JavaScript and Jquery courses, so I started work on an HTML5 web app that I would personally find useful. It is a calculator specifically for the GURPS RPG. Right now it simulates 3d6 die rolls with positive and negative modifiers to determine success and failure as well as critical success and failure for skill rolls, but there are a number of complex and time consuming math calculations in GURPS that I could add calculators for besides skill rolls. For example jumping height and distance, lifting. combat, ritual magic, ... the list goes on. Try the calculator out and let me know what you think so far.

If you are unfamiliar with GURPS, skill rolls are rolled on 3 6 sided dice against a skill level. The higher a skill level is the better with 10 being average. Effective skill is determined by a base skill level plus or minus any modifiers. The roll is compared to the effective skill. If the roll is over the effective skill it is a failure. If the roll is a 17 or 18 it is a critical failure. If the roll is under the effective skill it is a success with a roll of 3 or 4 giving critical success. Critical success and failure chances are also changed when skills are very above or below average, and this too is factored into the calculations.

Margin of success and failure is also important for game results so that is also determined in the calculations.

I look forward to any feedback, especially from anyone familiar with GURPS.

I tried linking to a workspaces project so people could easily look through the back end but apparently it did not work, So instead I have uploaded it to http://apps.jamaxxtest.com/gurpsulator-demo/. If anyone is interested in seeing the code for any particular part, let me know and I will post it here.