HOW BIG
DiscoverPlanets

Planets

Neptune: size, dimension and comparison

The adopted reference is about 49,244 km.

Mean diameter ≈ 49 240 km

49,244 km = 49,244,000 m. A kilometer contains 1,000 meters.

One of the eight planets in the Solar System.

Explore at this scale
Neptune, interpreted illustration
Interpreted illustration · dimension stated in the fact sheet.

What does this number measure?

Mean diameter calculated from the volume-equivalent radius in the NASA/JPL table. Rings and the outer atmosphere are excluded.

Compare the stated dimensions

The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.

Source and limitations

Catalogue value: a source is provided, but the measurement has not been individually audited in this project.

Interpreted planetary view. Textures and clouds are illustrative; this image is not a space-mission photograph or a scientific map.