Pluto
Pluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
How big is it?
2,377 km · mean diameter
Mean diameter · approximate
A little perspective
Pluto vs Triton: diameter comparison
The mean diameter of Triton is about 1.14 times the mean diameter of Pluto.
Pluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
Triton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Pluto
Mean diameter: 2,377 km; approximate.
Mean-radius spherical model for Pluto; actual shape is not perfectly spherical.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Triton
Mean diameter: 2,705 km; approximate.
Rounded mean-radius model of Triton. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
NASA JPL — Planetary satellite physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 2,377 km
We compare the mean diameter of Pluto. This is an estimate; check the notes for its rounding and uncertainty.
Mean-radius spherical model for Pluto; actual shape is not perfectly spherical.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2,377 km | Not recorded | approximate | |
| 1,188 km | Not recorded | approximate | |
| 7,466 km | Not recorded | derived | |
| 17,740,000 km² | Not recorded | derived | |
| 7.029 × 10⁹ km³ | Not recorded | derived | |
| 1.303 × 10¹⁹ t | Not recorded | approximate | |
| 0.62 m/s² | Not recorded | approximate | |
| 39.48 AU | Not recorded | rounded orbital anchor | |
| 17,060 km/h | Not recorded | rounded orbital anchor |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePlanets, moons and spaceEris2,326 kmDiameterEris is a dwarf planet in the scattered disc region beyond Neptune, composed of rock and ice.
Around the same scalePlaces and natural featuresMurray River2,530 kmApproximate main-channel lengthThe Murray River is a major river in southeastern Australia, flowing from the Snowy Mountains to the Southern Ocean.
Nearest higher valuePlanets, moons and spaceMoon3,475 kmMean diameterThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NASA JPL — planetary physical parametersMean radii and masses. Spherical area and volume here are derived from mean radius. This atlas rounds for scale comparison.
- NASA — Planet CompareConventional surface gravities; giant-planet values refer to an atmospheric reference level. Earth uses standard gravity, 9.80665 m/s².
- Defined examples — our methodology
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.
SpaceTriton2,705 kmTriton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
SpaceEuropa3,122 kmEuropa is a natural satellite of Jupiter, with a smooth icy surface thought to cover a subsurface ocean.SpaceEris2,326 kmEris is a dwarf planet in the scattered disc region beyond Neptune, composed of rock and ice.
SpaceIo3,643 kmIo is a natural satellite of Jupiter, covered with active volcanoes and sulphur deposits.