Windows Calculator, Wolfram Alpha, Google Calculator, Soulver, SpeedCrunch, RealCalc Scientific Calculator, Numi, NoteCalc, PCalc, galculator, Sticky Calculator, Integral Calculator, NumWorks Graphing Calculator, GeoGebra Scientific Calculator, OpalCalc, Frink, Qaltex, Median Calculator, Multi Share Calculator, Ruvenss Calculator, Algebra Calculator, GNOME Calculator, makina, Physics Formulas Calculator, Converters360, Real Time Calculator, JustBrowsing Calculator, CrossCalc, Getcalc, MochiMicho Calculator, Rule of 3 Calculator are some alternatives to Numbat.