When comparing the size of the Earth and Moon, volume or mass can be considered.
From Wikipedia for Earth:
Volume 1.0832073 × 10^12 km^3
Mass 5.9736 × 10^24 kg
From Wikipedia for Moon:
Volume 2.1958 × 10^10 km^3
Mass 7.3477 × 10^22 kg
With some simple calculations:
The Earth has just over 49 times the volume of the Moon.
The Earth is over 81 times as massive as the Moon.
Clearly the Earth is also a lot denser which must be because it has collapsed under it's stronger gravitational field due to being more massive.
|Includes CC-BY-SA content from Wikipedia's Moon article (authors)|
|Includes CC-BY-SA content from Wikipedia's Earth article (authors)|