Here's a kinda useful app that's quicker than your BB calculator. I found a link to it on BerryReview. Very simple form and function. It calculates tip amounts. It sounds like it could save some valuable time at a restaurant so you can run home, put your quarantine mask back on and live in constant terror of Swine Flu.
Here's a link to the article if you'd like to read more: BBTipCalc. There are download links in the article.
There are other paid tip calculating apps, but I don't see why you would pay for some graphics and frills, when you don't need anything but the numbers. And besides...WE DON'T HAVE TIME TO MESS AROUND! THE SWINES ARE COMING!
Stay safe everyone.