RealCalc Scientific Calculator

RealCalc offers algebraic or RPN entry, degree/radian/grad angles and scientific, engineering or fixed display formats. The help distinguishes the rounded display from the internal value used in later calculations. Tap the display to copy either value, history, memories or the RPN stack. History keeps up to 50 results for recall and has a clear control. Unit conversion selects a category and source unit, shows matching outputs and lets a chosen result return to the calculator; most zero-valued ratio conversions substitute 1.0, and conversions/constants require decimal mode. The free app's RPN uses an unlimited stack without an entry buffer. Paid RealCalc Plus adds alternative stack styles, fractions/DMS, custom conversions and constants, landscape, a 12-digit display and 32-digit internal precision.