Moon size comparison
The Moon next to Earth, Mars, Pluto and the dwarf planet Ceres, drawn to scale. Diameters from NASA.
Moon size comparison: the tool
The sizes
- Earth: 12,756 km (7,926 mi) across.
- Mars: 6,792 km (4,220 mi) across.
- Moon: 3,475 km (2,159 mi) across.
- Pluto: 2,376 km (1,476 mi) across.
- Ceres: 952 km (592 mi) across.
| What | Size | Source |
|---|---|---|
| Earth Equatorial diameter. | 12,756 km (7,926 mi) across | NASA NSSDC |
| Mars Equatorial diameter. | 6,792 km (4,220 mi) across | NASA NSSDC |
| Moon Diameter. | 3,475 km (2,159 mi) across | NASA NSSDC |
| Pluto Equatorial diameter. | 2,376 km (1,476 mi) across | NASA NSSDC |
| Ceres Twice the stated radius of 476 km. | 952 km (592 mi) across | NASA Science |
Add anything else from the space size comparison list on the right, or yourself. More on the space size comparison page.
Drawings are to scale on the measured dimension. The other proportions of each silhouette are approximate.
Questions
How much bigger is Earth than Mars?
Earth is 12,756 km (7,926 mi) across and Mars is 6,792 km (4,220 mi), so about 1.9 times as wide. Figures from the sources listed below.
How many times bigger is the largest one here than the smallest?
Earth (12,756 km (7,926 mi)) is about 13.4 times the diameter of Ceres (952 km (592 mi)).
Which is the biggest on this page?
Earth, at 12,756 km (7,926 mi) across, from NASA NSSDC.
Sources
- NASA NSSDC: Planetary Fact Sheet (checked 2026-10-02)
- NASA Science: Ceres: Facts (checked 2026-10-02)
Last checked: 5 October 2026