Reply #8

Density and physical size determine surface gravity more than mere mass on those scales. Assuming it's rocky and made of roughly the same stuff as Earth, you'd have a planet with a little under twice the diameter and would be looking at about 1.96 gravities on the surface.

If it was the same diameter as Earth, which it absolutely certainly isn't, then you'd get seven gravities on the surface. If it was half as dense as Earth somehow, the surface gravity would actually be lower than here despite all the extra mass. It can lead to some pretty odd things; Jupiter's over three hundred Earth masses, but its gravity at what people define as its equivalent to "the surface" is only 2.58 g.