1) Pacific Ocean: Approximately 165.25 million square kilometers (64.20 million square miles)
2) Atlantic Ocean: Approximately 106.4 million square kilometers (41.1 million square miles)
3) Indian Ocean: Approximately 73.44 million square kilometers (28.36 million square miles)
4) Arctic Ocean: Approximately 14.06 million square kilometers (5.43 million square miles)