How to round a number in Dart

In order to round numbers in Dart, we can use the round() method. This method returns the closest integer to the input number. If cannot determine the closest integer (e.g. 0.5, -2.5, 3.5, etc), rounds away from zero.

Example:

import 'package:flutter/foundation.dart';

void main() {
  var x = 10.3333;
  if (kDebugMode) {
    print(x.round());
  }

  var y = -1.45;
  if (kDebugMode) {
    print(y.round());
  }

  var z = 4.55;
  if (kDebugMode) {
    print(z.round());
  }

  var t = 1.5;
  if (kDebugMode) {
    print(t.round());
  }
}

Output:

10
-1
5
2

You can find more information about the round() method in the official docs.

Further reading:

• Dart: Convert Class Instances (Objects) to Maps and Vice Versa
• How to Flatten a Nested List in Dart
• Inheritance in Dart: A Quick Example
• Flutter & Dart: 3 Ways to Generate Random Strings
• Flutter & Dart: Displaying Large Numbers with Digit Grouping

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