Brand new. InstaCalc. Just like the name says, it’s an instant making use of AJAX. No need to hit “enter”. Your results are written as you type, just like any other AJAX application. You can set a number of rows and even set variables and use them similar to Excel. One neat feature is that it understands words like “thousand”, “million”, etc.
You can even define a calculator and then embed it into an HTML page. Give it a try.
Source: TechCrunch

Hi Kevin, I’m glad you liked the site! Computers have been a part of my life too, and I’m always interested in new ways to make them useful and teach others about them. I hope InstaCalc can become a tool that helps people explain concepts to each other.
Always feel free to shoot questions or comments my way.
Thanks,
-Kalid