Making calculations in the browser - Browser Developer Tools
        by Sanju[ Edit ] 2012-07-14 17:23:09 
         
        
        	Making calculations in the browser - Browser Developer Tools
This tip makes a lot of sense, but it’s surprising how many people don’t use it! 
If you need to know the answer to a math calculation quickly (e.g. the width of three columns in a 456px container) you don’t need to open Calculator. 
Just type the math question in to the developer tools’ console and it will return your answer. It’s 152, by the way.