In Flutter, you can retrieve the status bar height using the `MediaQuery` class. The steps are as follows:

1. First, ensure your widget has access to the `BuildContext`.
2. Use `MediaQuery.of(context)` to obtain the current `MediaQueryData`.
3. From the `MediaQueryData`, access the status bar height via the `padding.top` property.

Here is an example:

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

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    double statusBarHeight = MediaQuery.of(context).padding.top;

    return Scaffold(
      appBar: AppBar(title: Text("Status Bar Height")),
      body: Center(
        child: Text("Status bar height is: $statusBarHeight pixels"),
      ),
    );
  }
}
```

In this example, we first retrieve the status bar height using `MediaQuery.of(context).padding.top` and display it on the screen. This method works consistently across different devices and platforms, including iOS and Android.

Flutter: How to Get the Status Bar Height?