List of smallest exoplanets
Below is a list of the smallest exoplanets so far discovered, in terms of physical size, ordered by radius. Some of these are unconfirmed and/or controversial.
List
The sizes are listed in units of Earth radii. All planets listed are smaller than Earth and being up to 0.7 Earth radii.| Exoplanet | Radius | Notes |
| SDSS J1228+1040 b | 0.01008824? | Remnant Iron core. |
| PSR B1828-11 b | 0.016 | Unconfirmed, controversial |
| KOI-115.03 | 0.0258±0.0015 | Unconfirmed, controversial |
| 1 Ceres | 0.074662903 | Shown for comparison |
| WD 1145+017 b | ~0.15 | Controversial, Possibly least massive exoplanet. |
| 134340 Pluto | 0.182580746 | Shown for comparison |
| Moon | 0.273925995 | Shown for comparison |
| Kepler-37 b | 0.3 | Provisionally smallest exoplanet. |
| PSR B1257+12 b | 0.338? | Least massive exoplanet, at 0.02 Earth masses. |
| Mercury | 0.38251803 | Shown for comparison |
| Kepler-444 b | 0.403 | |
| Kepler-102 b | 0.47 | |
| Kepler-444 c | 0.497 | |
| Kepler-1308 b | 0.5 | |
| Kepler-138 b | 0.52 | |
| Kepler-444 d | 0.53 | |
| Mars | 0.531436186 | Shown for comparison |
| Kepler-62 c | 0.54 | |
| Kepler-444 e | 0.546 | |
| Kepler-42 d | 0.57 | |
| Kepler-102 c | 0.58 | |
| KOI-1843.03 | 0.59 | |
| Kepler-1087 b | 0.59 | |
| Kepler-1583 b | 0.59 | |
| K2-89 b | 0.617 | |
| Kepler-1371 c | 0.63 | |
| UCF-1.02 | 0.64 | Unconfirmed, controversial |
| Kepler-1542 c | 0.64 | |
| Kepler-1351 b | 0.64 | |
| UCF-1.01 | 0.65 | Unconfirmed, controversial |
| Kepler-271 d | 0.65 | |
| Kepler-431 c | 0.654 | |
| Kepler-1558 b | 0.67 | |
| Kepler-1349 b | 0.68 | |
| Kepler-141 b | 0.69 | |
| Kepler-1339 b | 0.69 | |
| Kepler-378 c | 0.7 |