991 EX Calculator

991 EX Calculator 991 EX Calculator is an Android education app by MARTINs, offering a CASIO FX-991 EX/DEX-like interface with scientific/engineering tools, equation solving, matrix & vector math, unit conversion, and saved history.

991 EX Calculator

991 EX Calculator is an Android app created by MARTINs. It aims to be a true 1:1 replica of the CASIO FX-991 EX/DEX, a calculator known for being both intuitive and highly capable. The app is widely used because it’s straightforward to operate, and it’s free to use with no hidden fees.

The goal is to give you the same kind of experience as the physical model. It includes the calculator’s core capabilities such as scientific and engineering notation, along with statistics and financial calculations. You can also perform matrix and vector computations, making it useful for both students and professionals. The interface is user-friendly, and the app stays lightweight, so it won’t take up much storage on your device.

MULTIFUNCTIONAL UTILITIES

The app’s tools are planned to keep improving over time. Users can also expect certain utilities to be added, including smart handling of information so it remains available when you need it.

Integrated Tools

Some functions you might not expect—like a QR scanner and a periodic table—are included. These additions are meant to support your calculations with relevant references and quick input.

Unit Conversion Made Simple

The calculator collects a wide range of units and lets you convert between them easily. Relationships between values are processed automatically to help you get the result you expect.

History Retention

When you’re working through more complicated problems, the built-in history feature helps you save previous calculations, so you can continue or finish solving without starting over.

Key Features

• Advanced multi-purpose calculator
• From basic math to advanced functions
• Combines hyper-calculator style tools with simple scientific calculations
• Powerful equation solver
• Engineering simulator style calculations
• Supports calculations with very large digit counts, including prime factors, random numbers, combinations, permutations, GCD, and LCM
• Graphing for function, including polar, parametric, and implicit functions



• Calculus tools such as integration and differentiation
• Math and physics helpers: formulas, unit conversion, theme and font options, and programming support

Conclusion

In short, 991 EX Calculator is a strong option if you want a powerful calculator on your Android device. It’s built as a 1:1 clone of the CASIO FX-991 EX/DEX, offering an easy-to-use layout, a smooth user experience, and a lightweight design that doesn’t heavily burden your storage.