Britannica Sources used in this answer

How much of Earth’s surface is covered by the Atlantic Ocean?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

The Atlantic Ocean covers approximately one-fifth of Earth’s surface.12

Its total area varies depending on whether its dependent seas are included in the measurement:

Without dependent seas: Approximately 31,568,000 square miles (81,760,000 square km)12
With dependent seas: Approximately 32,870,000 square miles (85,133,000 square km)123