Planet Diameter Comparison (NASA KM Data)
How wide is Jupiter? Compare 13 NASA diameters, from Vesta at 525 km to Jupiter at 142984, with Earth, Moon, Mars, Saturn and Pluto. See all 13 rows inside.
Visual comparison
All values
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| Name | Value | Context | Source |
|---|---|---|---|
| Vesta Mean diameter 525. Smallest here. | 525 kilometers | Asteroid belt body, Dawn target | NASA Dawn mission science: Vesta mean diameter 525 km |
| Ceres About 940 across. A third of the belt mass. | 940 kilometers | Inner system dwarf planet, Dawn target | NASA Dawn mission Ceres page: about 940 km across |
| Eris 2326 per NASA. Near Pluto in size. | 2,326 kilometers | Scattered disc dwarf planet | NASA JPL planetary parameters: Eris diameter 2326 km class |
| Pluto 2377 equatorial. Older tables print 2376. | 2,377 kilometers | Kuiper Belt dwarf planet, New Horizons target | NASA Science Pluto facts: equatorial diameter 2377 km |
| Moon 3475 equatorial. About a quarter of Earth. | 3,475 kilometers | Earth natural satellite, reference row | NASA Planetary Fact Sheet: Moon diameter 3475 km |
| Mercury 4879 equatorial. A little over one third of Earth. | 4,879 kilometers | Smallest planet, closest to the Sun | NASA Planetary Fact Sheet: Mercury diameter 4879 km |
| Mars 6792 equatorial. About half of Earth. | 6,792 kilometers | Fourth planet, thin atmosphere | NASA Planetary Fact Sheet: Mars diameter 6792 km |
| Venus 12104 equatorial. Near Earth in width. | 12,104 kilometers | Second planet, Earth twin in size | NASA Planetary Fact Sheet: Venus diameter 12104 km |
| Earth 12756 equatorial. Mean runs 12742. | 12,756 kilometers | Third planet, home yardstick | NASA Planetary Fact Sheet: Earth diameter 12756 km |
| Neptune 49528 equatorial. About four Earths wide. | 49,528 kilometers | Ice giant, fastest winds | NASA Planetary Fact Sheet: Neptune diameter 49528 km |
| Uranus 51118 equatorial. Just over Neptune. | 51,118 kilometers | Sideways ice giant | NASA Planetary Fact Sheet: Uranus diameter 51118 km |
| Saturn 120536 equatorial. About nine and a half Earths. | 120,536 kilometers | Ringed gas giant | NASA Planetary Fact Sheet: Saturn diameter 120536 km |
| Jupiter 142984 equatorial. About eleven Earths. Widest here. | 142,984 kilometers | Largest planet, gas giant | NASA Planetary Fact Sheet: Jupiter diameter 142984 km |
About this converter
NASA prints planet diameters at the equator, and this table follows that sheet. Vesta opens at 525 km, Ceres at 940, Eris at 2326, Pluto at 2377, Moon at 3475, Mercury at 4879, Mars at 6792, Venus at 12104, Earth at 12756, Neptune at 49528, Uranus at 51118, Saturn at 120536 and Jupiter at 142984. That makes Jupiter about eleven Earths wide. Gas giant figures run to the visible cloud tops. Small body rows pin mean diameters, as noted.
How to use it
Pick two entries and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. One box holds a count of the first, one holds the matching count of the second, one holds the diameter in the chosen unit. Try 1 Jupiter against Earths.
Planet rows pin equatorial diameter from the NASA Planetary Fact Sheet. Earth mean diameter is 12742; the row uses 12756 equatorial. Pluto rows 2377 from NASA Science; the older fact sheet table prints 2376. Ceres rows 940 from Dawn data and Vesta 525 mean. Eris rows 2326 per NASA. Feet stay out because planets sit far above human scale. Radii are half these figures; double checking against radius sources keeps math clean.
FAQ
How wide is Jupiter?
142984 km equatorial, per the NASA Planetary Fact Sheet. About eleven Earths.
How wide is Earth?
12756 km equatorial. The mean figure is 12742.
How wide is Pluto?
2377 km per NASA Science. Older tables print 2376.
What is the smallest body here?
Vesta at 525 km mean, from Dawn mission data.
Sources
- NASA Planetary Fact Sheet metric table, NSSDCA (Mercury through Neptune plus Moon equatorial diameters)
- NASA Planetary Fact Sheet notes (diameter defined as equatorial, gas giants to cloud tops)
- NASA Science Pluto facts page (equatorial diameter 2377 km, New Horizons era)
- NASA Dawn mission pages and JPL planetary parameters (Ceres 940, Vesta 525 mean, Eris 2326)
Last verified: 2026-09-30 · 13 entries
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