Check this site:
http://en.wikipedia.org/wiki/Gravitation
Which planet has the gravitational force that is closest to Earth's gravitational force?
2 answers
Which planet is closest to size of Earth?
It is a little more complicated than that, but that will get you close.
http://idahoptv.org/ntti/nttilessons/lessons2000/lau11.html
It is a little more complicated than that, but that will get you close.
http://idahoptv.org/ntti/nttilessons/lessons2000/lau11.html