HOW BIG
DiscoverPlanets

Planets

Mercury: size, dimension and comparison

The adopted reference is about 4,878.8 km.

Mean diameter ≈ 4 879 km

4,878.8 km = 4,878,800 m. A kilometer contains 1,000 meters.

One of the eight planets in the Solar System.

Explore at this scale
Mercury, 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.

Compare with Mars in the explorer →

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.