In Dart is there a quick way to convert int to double?

In Dart 2.1, integer literals may be directly used where double is expected. (See https://github.com/dart-lang/sdk/issues/34355.)

Note that this is syntactic sugar and applies only to literals. int variables still won't be automatically promoted to double, so code like:

double reciprocal(double d) => 1 / d;

int x = 42;
reciprocal(x);

would fail, and you'd need to do:

reciprocal(x.toDouble());

Simply toDouble()

Example:

int intVar = 5;
double doubleVar = intVar.toDouble();

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Thanks to @jamesdlin who actually gave this answer in a comment to my previous answer...

You can also use:

int x = 15;
double y = x + .0;