50 moons could fit inside the Earth and 1,321 Earths could fit inside Jupiter, so Sailor Jupiter is 66,050 times the size of Sailor Moon. This chart by Twitter member Sario572 scales the Sailor Scouts in the anime series Sailor Moon to the relative size of the planets that they represent.
From right to left, they are Sailor Jupiter, Sailor Saturn, Sailor Uranus, Sailor Neptune, Sailor Venus, Sailor Mars, Sailor Mercury, Sailor Moon, and . . . I honesty don't know about the last two.
You can see a much larger version here.
-via Richard Eisenbeis