Twice the source mean radius; body diameter only, excluding rings.
Jupiter changes the scale of the scene. Earth remains visible, but its familiar disk now feels small. Switch to “How many across?” to turn that impression into a line of Earth diameters.
Which Jupiter diameter?
This comparison uses the volume-equivalent mean diameter, rather than the larger equatorial diameter. That distinction matters for a flattened planet. If you see a different ratio elsewhere, check which diameter was used.
Keep going
Compare Jupiter with the Sun. A giant in one pairing becomes the smaller object in the next. Explore Jupiter versus the Sun.