Planets - Calculate Volumes

Calculator for the approximate volumes of Sun, Moon, Earth and the planets in cubic kilometers, cubic miles and compared to each other. The common unit for large volumes is cubic kilometers, km³. The volume is a three-dimensional unit, therefore the very large values and differences between big and small celestial bodies. Earth has slightly more than one trillion cubic kilometers, the Moon has about 22 billion and Jupiter has more than 1.5 quadrillion cubic kilometers.

Cubic kilometers:
Cubic miles:
Volumes		km³ mi³ Earth volume Jupiter volume Sun volume
Moon:
Mercury:
Venus:
Earth:
Mars:
Jupiter:
Saturn:
Uranus:
Neptune:
Pluto:
Sun:

Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places.

Please enter one value, the other values will be calculated.

Example: Sun has 109 times Earth's diameter. With its 1.4 quintillion km³, it has 1.3 million times the volume of Earth, which is almost exactly 109³.

If the radius of a celestial body doubles while its shape remains constant, its volume increases eightfold. This is because the radius extends along one dimension while volume extends along three. Consequently, the value must be doubled three times to arrive at the new volume. Mathematically expressed as 2³=8. Therefore, a planet with a diameter just 1.26 times (the cube root of two) that of Earth possesses twice Earth's volume. Earth is the largest rocky planet in our solar system, whereas gas giants are considerably larger. However, there are indeed exoplanets, rocky ones, in this size range and even larger.
When discussing the size of a celestial body, the term may refer to the radius or diameter, the surface area, or the volume, depending on the context. Without specific context, size implies dimensions in all directions, that is volume, although volume of celestial bodies is arguably cited or discussed less frequently than the other measurements.
While greater volume also tends towards greater mass, density also plays a role. Saturn, for instance, has roughly 764 times the volume of Earth but only about 95 times its mass.

Last updated on 08/01/2026. Author: Jürgen Kummer

Calculators for Planets and Astronomy

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