A US pint (that is, the fluid pint) is a unit of volume measure equal to 2 cups, ½ quart, or 16 fluid ounces. It is approximately equal to 473 ml. When converting a recipe to metric, it is usually sound to round the pint to 500 mL, along a pound of 500 g.
The dry pint, approximately 551 ml, is not commonly used in cooking. It is used in the sale of some items such as blueberries in the United States.
The Imperial pint is almost exactly 20% larger, 568 ml, and divided into 20 imperial fluid ounces rather than 16 US fluid ounces. (Note that US fluid ounces are slightly larger than imperial fluid ounces.)