These are the planets, ranked in order of how many Earths they can fit. Topping the list, is the whopper of a planet, Jupiter, capable of fitting 1,300 Earths. The next giant, Saturn, has a planetary volume that can fit 764 Earths.
The next two planets larger than Earth are Uranus and Neptune, capable of containing 63 and 57 Earths respectively. Earth sits somewhat in the middle and can fit the remaining smaller planets - Venus, Mars and Mercury.