How many sq km is planet earth?

Earth's Circumference at the Equator: 24,901.55 miles (40,075.16 km)

Earth's Circumference Between the North and South Poles: 24,859.82 miles (40,008 km)

Earth's Diameter at the Equator: 7,926.28 miles (12,756.1 km)

Earth's Diameter at the Poles: 7,899.80 miles (12,713.5 km)