Seeking feedback on bread formula calculator
I've created a bread formula calculator -- just for the fun of it. Here's a link: http://happybreadhouse.com/post/16327906955/ciabatta-formula 
Before I use this to post other formulas, I would love some feedback on how the tool works.
More background for anyone who cares:
I started a bread tumblr page last year... mostly just to learn how Tumblr works (http://happybreadhouse.com )
It's been fun, but I was never happy about how I posted bread formulas/recipes. Nowadays, I use ms excel to calculate my bread formulas based on baker's percentages, etc. I wanted to provide something similar on the web page.
Today, I geeked out and created an interactive page that allows the viewer to specify how much bread they want to make and the page will automatically recalculate the formula based on the baker's percentages and the desired amount of dough.
The generated page will lists the ingredients in grams, ounces and approximate volumetric measurements (cups, teaspoons, etc.)
I would love to hear if people thinnk this is useful, or how it might be improved. Are there any other sites like this available? I could not find any.