Calculator 991 (CalcES) is a compact scientific calculator app designed for accurate arithmetic and common engineering calculations, with an expression editor, history, and standard scientific functions.

Features

• Calculator 991 (CalcES) provides basic and scientific operations including addition, subtraction, multiplication, division, powers and roots.
• Common scientific functions: trigonometry, logarithms, factorials and percentage calculations.
• Expression input with operator precedence and parentheses for multi-step calculations.
• Calculation history and memory slots to review and reuse past results and recent expressions.
• Angle modes (degrees and radians) to suit different calculation needs.

How to use

Calculator 991 (CalcES) focuses on straightforward input: type an expression, use parentheses to control order of operations, and recall previous results from history or memory for continued calculations. The layout is designed for quick, reliable calculations without unnecessary complexity.