Google adds in new functions in its search every year. A couple of years ago, it quietly added the ability to calculate mathematical equations right from the search box.


If you enter 25 + 35, Google will return 25 + 35 = 60, along with, of course, an option to search for documents that include the term 25 + 35.
To use Google's built-in calculator function, simply enter the calculation you'd like done into the search box and hit the Enter key or click on the Google Search button. The calculator can solve math problems involving basic arithmetic, more complicated math, units of measure and conversions, and physical constants.
Try one of the sample expressions below, or refer to google complete instructions for help in building your own.

http://www.google.co.in/help/calculator.html



These sample queries demonstrate the utility and power of this new feature:

5+2*2
2^20
sqrt(-4)
half a cup in teaspoons
160 pounds * 4000 feet in Calories