What is your favorite running calculator? I had been using lots like McMillan, RunningForFitnes, RunnersWorld, etc, but I was not satisfied with the results or the calculations was not complete or seems to me illogical. Because of that I rather made mine as android app, so if you are interested visit.
https://play.google.com/store/apps/details?id=pub.runners.runnerspub
Please give any feedback for improvement or adding functionality you need. I can add almost everything what is reasonable...