In-Line Calculator

In most text input areas on most webpages, type your expressions between double square brackets. For example:

[[2+2]]

[[3-(4*.2)]]

[[(.5*.44-.2)^(1/5)+12]]

The expressions will be evaluated and the text replaced as soon as you type the second closing bracket:

[[2+2]]
--> [[4

[[3-(4*.2)]]
--> [[2.2

[[(.5*.44)^(1/5)+12]]
--> [[12.7387

The brackets remain open so you can perform successive operations quickly without touching the mouse. Simply add a third closing bracket when you're done to "exit" the calculator.