Automatic eligibility
Players whose 19th birthday falls during or before the calendar year of the draft, are at least one year removed from the graduation of their high school class, and who do not meet the criteria for "international" players are automatically eligible if they meet any of the following criteria:
They have completed 4 years of their college eligibility.
If they graduated from high school in the U.S., but did not enroll in a U.S. college or university, four years have passed since their high school class graduated.
If they did not graduate from high school in the U.S., four years have passed since their high school class graduated.
They have signed a contract with a professional basketball team outside of the NBA, anywhere in the world, and have played under that contract.
Those who have reached the minimum eligibility age of 19 and meet the criteria for "international" players are automatically eligible if they meet any of the following criteria:
They are least 22 during the calendar year of the draft.
They have signed a contract with a professional basketball team outside of the NBA within the United States, and have played under that contract.