CalcTastic is a high-precision, feature-rich scientific calculator with years of refinement and thousands of satisfied users. Choose from 5 different themes, a configurable display and your choice of operation, Algebraic or RPN. CalcTastic is FREE but comes with many great features including a Unit Converter, Fractions, Complex Numbers, Advanced Statistics, History & Memory Registers and a full-online Help Section. If you find CalcTastic Scientific Calculator useful, consider the PLUS version ($3 USD). The PLUS version also includes Polar-Form Complex Numbers, 7 Additional Themes and a Full-Featured Programmers Calculator. -------------- GENERAL - High Internal Precision - Two Algebraic Modes with Editable Equations - Two RPN Modes with up to 50 Stack Registers - A Basic Mode with all the Essentials - Calculation History with 50 Records - Memory with 10 Registers - 5 High-Quality Themes - Copy and Paste - Configurable Numeric Display (Decimal and Grouping) - Easier to use than many other Calculator Apps - Quicker than locating your Casio & HP Calculator (11C / 15C) SCIENTIFIC - Rectangular Form Complex Number Support - Real, Imaginary, Magnitude, Argument and Conjugate Functions - Fractions and Fraction Calculations - Convert Decimals to Fractions - Degree, Minute, Second Support - Standard, Scientific, Engineering and Fixed Decimal Notations - Configurable Display Precision from 0 - 12 digits - Table of 44 Physical Constants - 289 different conversion units across 18 categories - Trig functions in Degrees, Radians or Grads - Hyperbolic Trig functions - Natural and Base-10 Logarithms - Percent and Delta Percentage - Remainder, Absolute, Ceiling and Floor operations STATISTICAL - Factorial - Combinations and Permutations - Random Number Generator - 15 Single-Variable Statistics - Quantity, Min, Max, Range, Sum, Median - Arithmetic Mean, Geometric Mean, Mean Squared - Sum Squared, Sum of Squares of Variance - Sample Variance, Sample Standard Deviation - Population Variance, Population Standard Deviation