This plugin 'JCalculator' can calculate the words you write, and you would be interesting at this plugin 'JCalculator' if you want to get the features for your calculations:
* Supporting bit computing such as the operators left/right shift, and, or etc.
* Supporting functions (till now there is only the function 'POWER' has been appended).
* Supporting calculate the selected words in the buffer of jEdit.
* Providing recoder for calcualtions and calculate result.
* Highlight the input error