The world's population is 7 billion[32] and Earth's total area (including land and water) is 510 million square kilometres (197 million square miles).[33] Therefore, the worldwide human population density is 7 billion ÷ 510 million km2 (197 million sq mi) = 13.7 people/km2 (35 people/sq mi). If only the Earth's land area of 150 million km2 (58 million sq mi) is taken into account, then human population density increases to 46.7 people/km2 (121 people/sq mi). This calculation includes all continental and island land area, including Antarctica.