Make a Calculator App with Flutter

What This App Does

A Calculator app serves a specific and growing need in today's mobile-first world. Building one with Flutter means you ship to iOS, Android, and the web from a single codebase, cutting development time dramatically while keeping a native-quality experience.

In this guide we walk through the essential features of a Calculator app, the packages that handle the heavy lifting, and the Dart code that ties everything together.

Main Features

Feature	Why It Matters
Expression Display	Show the full expression as the user types, not just the result
Basic Operations	Add, subtract, multiply, divide with proper operator precedence
Memory Functions	MC, MR, M+, M- buttons for storing temporary values
History Log	Keep a scrollable list of past calculations
Scientific Mode	Trigonometric, logarithmic, and exponential functions in a side panel

How to Make a Calculator App with Flutter

1. Expression Display

Show the full expression as the user types, not just the result

Reach for math_expressions for parsing and evaluating expressions to implement this without reinventing the wheel.

2. Basic Operations

Add, subtract, multiply, divide with proper operator precedence

Reach for provider for state to implement this without reinventing the wheel.

3. Memory Functions

MC, MR, M+, M- buttons for storing temporary values

Reach for provider for state to implement this without reinventing the wheel.

4. History Log

Keep a scrollable list of past calculations

Reach for provider for state to implement this without reinventing the wheel.

5. Scientific Mode

Trigonometric, logarithmic, and exponential functions in a side panel

Reach for provider for state to implement this without reinventing the wheel.