Have you ever noticed that web browser has a calculator tool? If not I will tell you that almost all latest popular browser provide developer tools.
Actually developer tools are important tools for web developer but for non-developer still can use it for another purpose for example as a calculator. For Windows user surely will have default calculator but sometime you are too lazy to open it so when you need simple or complex calculation, you can use it as your calculator.
So how? Just open developer tools from your browser and open web console and make it as your calculator just type any calculation there. For more details just see how at some browser below:
Firefox
Click Firefox Orange button and dig Web Developer and click Web Console. On the web console just make any calculation for example
4*4 press enter to find the answer
Google Chrome
Click triple bar setting menu and dig Tools and click Javascript console. On the Javascript console just make any calculation for example
Math.pow(2,4) and press enter to find the answer.
Internet Explorer
Press F12 from your keyboard to open developer tools window and click Console tab and make any calculation there for example
100-2 and press enter to see the answer.
Firefox and Google Chrome provide auto suggestion if you type Math command but if you want to find complex calculation you need to know some JavaScript Math because basically it functions are for web developer and you can find some of them from JavaScript Math Object. Enjoy it!