Mercury is the smallest planet in our solar system, both in terms of diameter and mass. Its diameter is approximately 4,879 kilometers (3,032 miles), which is only about 38% of Earth's diameter.

Compared to Other Planets:

Here's how Mercury's size compares to other planets in our solar system:

1. Jupiter: Mercury is about 1/18th the diameter of Jupiter and about 0.055% of Jupiter's mass.

2. Saturn: Mercury is approximately 1/9th the diameter of Saturn and about 0.033% of Saturn's mass.

3. Uranus: Mercury is about 1/5th the diameter of Uranus and about 0.022% of Uranus's mass.

4. Neptune: Mercury is approximately 1/4th the diameter of Neptune and about 0.017% of Neptune's mass.

5. Earth: Mercury is about 38% the diameter of Earth and about 5.5% of Earth's mass.

6. Venus: Mercury is slightly smaller than Venus, with a diameter that is about 95% of Venus's diameter. Mercury's mass is about 18% of Venus's mass.

7. Mars: Mercury is larger than Mars, with a diameter about 1.65 times that of Mars. Mercury's mass is approximately 2.28 times that of Mars.

So, although Mercury is not the largest planet, it is larger than all of the dwarf planets in our solar system, including Pluto.