HappyCalc is a practical calculator app for everyday arithmetic and basic scientific calculations. HappyCalc provides a clean interface, a calculation history, and standard memory functions for quick reference and repeated use.

Key functions

• Basic arithmetic: addition, subtraction, multiplication, division, percent and parentheses.
• Scientific functions: trigonometry, logarithms, powers and roots with degree/radian mode.
• Memory and history: store values, recall recent calculations, and edit previous entries.
• Display options: switch between light and dark modes and adjust digit grouping.

How to use

Use the numeric keypad to enter expressions and press equals to evaluate. HappyCalc saves recent results in the history panel for review, and memory keys allow copying values into new calculations. Settings let you configure angle units and display preferences.