Simple Sourdough Starter Discard Recipe Calculator

Fellow bakers-

There are so many great bread calculators available helping us in one way or another with bakers percentages.  One that I could not find was a simple calculator to help maintain proper hydration levels when adding some percentage of discard to recipes that don't typically use sourdough, e.g. tortillas.   So I created this calculator at www.pandulce.info which gives proper measures when replacing flour and water in a recipe with some percentage of sourdough discard having user selectable hydration levels.  I also included a small handful of sample recipes which you can find in the navigation bar.  

Two screens, that's it.  Here's the landing screen:

Here's the screen that shows the calculated recipe after baking your original recipe:Would really appreciate any feedback from this forum of devoted bakers.  I welcome critical comments about anything, including the look, feel, accuracy, recipes and any features you'd like to see.  

Thanks for your time.  Happy baking!

-FAE