scaler 1.1.2+1

Set your width height on the basis of percentage of the screen. Its value will be between ( 0 -1 ) set the value between 0 to 1 for 0 to 100% scale to width/height of screen.

example/main.dart

import 'package:flutter/material.dart';
import 'package:scaler/scaler.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Scaler Responsive UI Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Set width/height in percentage'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool isVisible = false;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Container(
          height: Scaler.height(0.25, context),
          width: Scaler.width(0.25, context),
          child:
              Container()), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}