DuoCalculator

Contains adsIn-app purchases
500+
Downloads
Content rating
Everyone
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About this app

The ultimate calculator: rotate your phone between a basic and a very capable scientific one (but you can lock it down to one, if you prefer):

In portrait mode, you have a basic calculator with:
- basic mathematical operations
- 00 and double-sized plus buttons
- normal and financial (two decimal digits) display
- percent, reciprocal, square and square root
- memory add, subtract, read, write, clear
- value added tax calculation
- currency conversion
- paper-like, scrollable multi-line display.

When you are in landscape mode, the calculator becomes a full-fledged scientific calculator with:
- seven modes: normal (decimal and fraction), engineering, scientific, fixed point, complex, programmer's, statistics
- true 128-bit decimal floating point calculations without rounding errors (retaining significant trailing zeroes)
- precision up to 32 decimal places, number range: 1e-6143 to 1e+6144 (as per the IEEE 754 standard)
- basic and advanced operations (modulo, power, root, exponential, logarithmic, trigonometric, hyperbolic)
- standard mathematical operation precedence
- trigonometric functions: arguments in radians, degrees and gradians, angle conversion
- random numbers
- infinitely nested parentheses
- advanced data entry: decimals, fractions, scientific, engineering (SI) prefixes (atto to zetta)
- sexagesimal calculation with degrees, minutes and seconds
- rectangular and polar co-ordinates
- memory functions
- complex numbers, absolute values and arguments, complex support for all exponential, logarithmic, trigonometric and hyperbolic functions
- programmer's mode: binary, octal, decimal, hexadecimal with logical and shift operations
- statistical mode: mean values, standard and popular deviations, various x and y summa values, permutations, combinations, GCD, LCM, prime testing, factorization

If you have a crash, please, send a report to the support address. This is the only way to fix it for you and for others. :-)
Updated on
Sep 1, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity, App info and performance, and Device or other IDs
This app may collect these data types
App activity, App info and performance, and Device or other IDs
Data is encrypted in transit
Data can’t be deleted

What’s new

16k page requirement