JCalculator is a freeware. You can evaluate some mathematical expressions by entering an expression to be evaluated and pressing the CALCULATE button. Copy and paste the results to the other application. The results could be revived since the calculation history is stored in the combo box.
The calculator can evaluate mathematical expressions such as
((-(1.2 + 0.5 ^ 0.7) ^ 0.9 + 3.0 (4.0 * 5.1 + 0.9 ^ 0.11))*0.5 - 0.3^4 ) 5