Online Calculator for Free Calculations | Casio fx-991CW Calculator

Online Scientific Calculator (FX-991CW Style)

This online scientific calculator is built for students, engineers, and daily users who want a reliable alternative to a physical Casio-style calculator. It works directly in your browser and supports angle modes, fractions, and scientific functions.

Unlike basic calculators, this tool is designed with a real calculator layout: a clear display at the top and function keys below, making it easy to use on both desktop and mobile.

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DEG

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Calculator Features

• DEG and RAD angle mode (for trigonometry)
• Fraction to decimal conversion
• Square root and scientific functions
• Dark mode for night use
• Mobile-friendly compact keypad

How to Use This Calculator

Select DEG or RAD before using trigonometric functions. For fractions, enter a value and tap the a/b button to convert it. All calculations run instantly without page reloads.

Disclaimer

This calculator is intended for educational and general calculation purposes. Results may vary slightly due to rounding differences compared to physical calculators.