currently asia is earth s largest continent at approximately 17300000 square miles 44806812 sq km africa comes in second at about 11700000 square miles 30300000 sq km1 asia 4001623990 over 4 billion 2urrently asia is earth s largest continent at approximately 17300000 square miles 44806812 sq km africa comes in second at about 11700000 square miles 30300000 sq km 1