🧱 Planet Density Calculator
Mass divided by volume reveals what a world is made of — rock, gas, or ice.
Results
- Average density
- 5,513.26 kg/m³
- Earth check: ~5,514 kg/m³ · Water: 1,000 kg/m³
How it works
ρ = M / (4/3 π R³)
Earth is the densest planet (5,514 kg/m³) because gravity compresses its iron-nickel core. Saturn is so light (687 kg/m³) it would float in a big enough ocean.
Assumptions: Spherical planet, average density.
Reference: NASA Planetary Fact Sheets