The calculator you need for your everyday life, a currency converter and a unit converter. All in one! Powerful calculator: Memory Use as many parenthesis as you need: 3 + = 9. Calculate, add and subtract percentages on the fly: 50 x 3% = 1. 5. 50 + 3% = 51. 5. 50 - 3% = 48. 5. Square and cube a number. Quadratic and cube roots. Factorials.