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App Brewery Banner

BMI Calculator 💪

Our Goal

The objective of this tutorial is to look at how we can customise Flutter Widgets to achieve our own beautiful user interface designs. If you have a designer on board, no matter how unconventional their designs are, we can create them using Flutter.

What you will create

We’re going to make a Body Mass Index Calculator inspired by the beautiful designs made by Ruben Vaalt. It will be a multi screen app with simple functionality but full-on custom styling.

Finished App

What you will learn

  • How to use Flutter themes to create coherent branding.
  • How to create multi-page apps using Flutter Routes and Navigator.
  • How to extract and refactor Flutter Widgets with a click of the button.
  • How to pass functions as parameters and fields.
  • How to use the GestureDetector Widget to detect more than just a tap.
  • How to use custom colour palettes by using hex codes.
  • How to customise Flutter Widgets to achieve a specific design style.
  • Understand Dart Enums and the Ternary Operator.
  • Learn about composition vs. inheritance and the Flutter way of creating custom UI.
  • Understand the difference between const and final in Dart and when to use each.

This is a companion project to The App Brewery's Complete Flutter Development Bootcamp, check out the full course at

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