What’s the formula from mass to Gs?
Assuming no other differences, same volume and shape and 5*mass = 5Gs. however, if the size changes it roughly follows the inverse-square rule, with some minor modifications for distribution/shape and rotation effects in extreme circumstances. Above, Spunket suggests that if the picture of the planet is accurate, and that the distortion is caused by rotation effects that the rotation may reduce the subjective gravity by about 0.4Gs - which is some pretty extreme spinning.