Free Neutron Star Density Calculator
Estimate the average density of a neutron star from its mass and radius: rho = 3M / (4 pi r^3).
kg
m
Average Density
663,676,112,693,203,600 kg/m³
Relative to Nuclear Density2.89
Average Density vs Neutron Star Mass
Neutron Star Density
Formula
rho = 3M / (4π r³)
A typical neutron star (1.4 M_sun, 10 km radius) has an average density near nuclear density (~2.3 × 10¹⁷ kg/m³). A sugar-cube-sized chunk would weigh about a billion tonnes.
Example Calculation
A 1.4 M_sun neutron star with r = 10 km.
- 01rho = 3M / (4π r³)
- 024π r³ = 4π × (10000)³ = 1.257e13 m³
- 03rho = 3 × 2.78e30 / 1.257e13 = 6.63e17 kg/m³
- 04About 2.9 times nuclear density.