From KDE UserBase Wiki
      A scientific calculator - and more

    KCalc has everything you would expect from a scientific calculator, plus:

    • Trigonometric functions, logic operations and statistical calculations
    • A results stack which enables convenient recall of previous calculation results
    • Precision is user-definable
    • The display allows cut and paste of numbers
    • The display colors and font are configurable, aiding usability
    • The use of key-bindings make it easy to use without a pointing device
    A detailed manual is available on-line.

    FAQs, Hints and Tips

    • Press and hold the Ctrl key to see the key bindings for every button.