Wolfram Alpha, Google Calculator, Soulver, SpeedCrunch, Numi, Grapher, Uno Calculator, MyScript Calculator, HiPER Scientific Calculator, fxSolver, Excalibur, Graph.tk, Deskcalc, Simple Calculator, Numbat, Qalculate!, GeoGebra Scientific Calculator, Calculator++, Math42, Kalq, CalcPP, RTRO-CLC2, Calcbar, Standard Deviation Calculator, Unit Wolf, Limit Calculator, Magic Calculator, GNOME Calculator, VAT Calculators, Physics Formulas Calculator, Calcuverter, Supercalc, Converters360, ECW Expression Calculator, Getmathcharts.com, kanakku, Caracal Diagnosis, EBTCalc, JustBrowsing Calculator, EdenMath, MultiCalc, Sellertour PayPal fee Calculator, Oficalc, XCALC, Design Calculator, FinKit, Numeric Notes are some alternatives to PCalc.