How does the Earth look (regarding the size) if you were standing on the Moon?

The moon's diameter is about 3 478 km. It would probably look 3.68 times bigger, with a little error as the moon has an incredibly thin atmosphere.

Also you have to take in consideration that where the Moon subtends an angle of about 30' of arc, Earth will subtend an angle of 2 degrees, more or less.

It looks roughly four times as large in diameter as the Moon does from the Earth (since the distance is the same in both directions, and the actual diameter of the Earth really is about four times larger). It is also seen to go through a complete cycle of phases once every solar month, just as the Moon does. However, unlike the Moon, the Earth can also be seen to rotate, since it is not tidally locked to the Moon, and changing weather patterns (hurricanes and so on) would also be visible on its surface.

The angular diameter of the Moon as seen from the Earth is 0.5155 degrees. The Earth viewed from the Moon has an angular diameter of 1.8698 degrees (With small variations because the distance between varies by about 42,000 kilometers).

The Earth viewed from the Moon would look 3.627 times larger in diameter than the Moon from the Earth. That means the disc of the Earth would appear 14.072 times larger in surface area than the Moon's disc viewed from Earth.

Because the Earth reflects a higher percentage of the Sun's light (albedo) than the Moon, the Earth would provide 37.971 times as much light viewed from the Moon as the Moon viewed from the Earth (during comparable phases).

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Bigger and brighter. Being 4 times larger in diameter than the moon, the earth would have 16 times the surface area. Its higher albedo also makes it about 50 times as bright as the moon from earth.

Moon does not have water on it and its face is so much roughen from the strikes of meteoroids. on the opposite of it our Earth is having water and having atmosphere. so the main benefit of that is water is more reflective then any roughen or polished surface and the Earth is having atmosphere that means Earth is having Clouds that is the main benefit which moon does not have.

so the ans is from the Moon, Earth is looking 3 times bigger then moon we watch from Earth. and the Earth's Reflection power is 0.36 Magnitude and the moon's is 0.20 so Earth is looks like Blue shaded big ballsized of 3X bigger football.

See the famous photo taken by astronaut William Anders in 1968 during the Apollo 8 mission.

http://en.wikipedia.org/wiki/Earthrise

about seven times the size of the moon from earth

If you were on the Moon and extended your arm, you could cover it from your view using your thumb.

FLAT