Is California bigger than the east coast?

No, California is not bigger than the East Coast of the United States. The combined land area of the 14 East Coast states (Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, and South Carolina) is approximately 1.2 million square miles (3.1 million square kilometers), while the land area of California is approximately 163,700 square miles (423,970 square kilometers).