Mars is about half the size of Earth in terms of diameter. Specifically, Mars has a diameter of approximately 6,779 to 6,794 kilometers, which is roughly 53% of Earth's diameter of about 12,742 kilometers

. In terms of volume, Mars is about 15% (0.15 times) that of Earth, reflecting its smaller size and lower mass

. Mars's mass is about 10-11% of Earth's mass, which contributes to its surface gravity being roughly 38-40% that of Earth's gravity

. Regarding surface area, Mars has about 28% of Earth's surface area, which is roughly equivalent to all the dry land on Earth

. To summarize:

• Diameter: Mars is about 53% the diameter of Earth.
• Volume: Mars has about 15% of Earth's volume.
• Mass: Mars has about 10-11% of Earth's mass.
• Surface gravity: About 38-40% of Earth's gravity.
• Surface area: About 28% of Earth's surface area.

This makes Mars significantly smaller and less massive than Earth, with a lower gravitational pull on its surface