Planetary radius as a function of mass
Do a google image on "planetary radius as a function of mass" and you get all kinds of colorful graphs.
Also, look at figures 4 and 5 in this article.
https://www.gl.ciw.edu/static/users/bmilitzer/papers/34_seager_kuchner_hier-majumder_militzer_2007.pdf
or here, for density as a function of radius:
