Human beings have a height that is typically 1.7 or 1.8 meters (assuming you choose to use the height as the human's "size"!).
The Earth has a diameter of about 13,000 km, or 13 million meters. You can calculate from there; as you see, it is quite a big more than a million times bigger.
The above applies if you use linear measures (lengths). If you choose to compare surface area, the ratio would be several trillion; if you compare volumes, or masses, the ratio would be several quintillion.
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The Moon is about 3.7 times smaller than the Earth
It is 11.78 times bigger.
Its two times bigger than New Zealand
Australia is around 2.3 times the size of India, but India's population is bigger.
You have your moon and earth placed backwards. It takes 28-29 days for the moon to orbit the earth. Actualy, it has been scientificaly proven that the earth and moon go round each other. (see QI -BBC2)