Scientific Calculator

CalcTastic

About this app

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 ($3.99 USD). The PLUS version also includes Polar-Form Complex Numbers, 7 Additional Themes and a Full-Featured Programmers Calculator.

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GENERAL
- High Internal Precision
- Two Algebraic Modes with Editable Equations
- Two RPN Modes with Undo Support and up to 100 Stack Registers
- A Basic Mode with all the Essentials
- Calculation History with 100 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
- Over 300 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

Ratings and reviews

Finding a free calculator that has 1/x, +/-, and DMS was impossible until now. My only issue is when the result is a negative number, I will select the +/- and a new line starts with a negative instead of turning the result into positive. I have not yet figured out how to start a new line using the result from the previous line as I have only used single line calculators... until now.

I've been using this calculator for years. It's the only one I use anymore. Honestly can't find any fault with it. Totally free, ad free, the most comprehensive set of features I've found in any free calc app. All I will ever need for astrophysical calculations. Just great. 1,561 reviews a grand total of 2 critical. Need I say more?

An incredible amount of thought must have gone into this. The layout and feature set is fantastic. Multiple values can be saved to memory. The running ticker allow you to click on previous values and add them to your current equation. If all you want is a basic calculator, the basic mode hass all if the features I wanted in one calculator but couldn't find. The memory and ticker (tape) add a ton of value to the basic calculator too.

What’s new

- RPN users now have an UNDO feature that will revert the last stack operation.
- Updated power and nth-root to be more natural for each input type.
- Increased maximum history and stack sizes to 100.
- Added a setting to clear the screen when the app shuts down.
- Improved support for Android 15 devices.
- Visit the website for other minor improvements and fixes.