Hey, look, it's Hugo-nominated, Nebular-winning sf/f author Eric Jame Stone's Gravitator gravity calculator for astronomical bodies! Just, you know, enter in the radius and relative density for the object you wish to calculate, and it spews forth the relative gravity and acceleration due to gravity! It's useful for, well, exactly that kind of thing. I guess. Want to know the gravity of a diamond the size of the earth, for, say, some kind of story in which your characters find a diamond the size of the earth? Easy! It's .64 Earth normal gravity. So, uh, now you know.
http://www.ericjamesstone.com/blog/home/gravity-calculator-for-astronomical-bodies-based-on-radius-and-density/
And there's this tool I found, "Density of the Terrestrial Planets," which is sort of an educational exercise where you have to adjust the ratio of rock to iron core for the Earth, Mars, Mercury, Venus, and the Moon. It's useful for calculating the relative density of a planet based on its core composition.
http://www.mesacc.edu/~kev2077220/flash/planet-density.html
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