Here is the order of planets in our solar system, listed from largest to smallest based on their mean equatorial diameter:
Jupiter: Jupiter is the largest planet in our solar system, with a mean diameter of approximately 139,820 kilometers (86,881 miles). It is more than 11 times the diameter of Earth.
Saturn: Saturn is the second-largest planet, with a mean diameter of approximately 116,460 kilometers (72,367 miles). It is about nine times the diameter of Earth.
Uranus: Uranus is the third-largest planet, with a mean diameter of approximately 50,724 kilometers (31,518 miles). It is roughly four times the diameter of Earth.
Neptune: Neptune is the fourth-largest planet, with a mean diameter of approximately 49,244 kilometers (30,598 miles). It is slightly smaller than Uranus but still about four times the diameter of Earth.
Earth: Earth is the fifth-largest planet, with a mean diameter of approximately 12,742 kilometers (7,918 miles).
Venus: Venus is the sixth-largest planet, with a mean diameter of approximately 12,104 kilometers (7,521 miles). It is slightly smaller than Earth.
Mars: Mars is the seventh-largest planet, with a mean diameter of approximately 6,779 kilometers (4,212 miles). It is less than half the diameter of Earth.
Mercury: Mercury is the smallest planet in our solar system, with a mean diameter of approximately 4,879 kilometers (3,032 miles). It is the closest planet to the Sun.
Please note that the order provided is based on their mean equatorial diameter, and variations in measurements may exist due to irregular shapes or measurements taken along different axes.