13precision calculators — cosmology, stellar physics, black holes, orbital mechanics & more
Engineered by Mahesh Naidu ↗·Research & Development · All computations run locally in your browser
13
Calculators
12
Physical constants
6
Fields of physics
100%
Client-side only
AstroFun by C. Marasco · Simulate planet formation, stellar evolution, black holes, and solar system dynamics · Runs in-browser via WebGL
c
Speed of light
2.99792 × 10⁸ m/s
G
Gravitational constant
6.674 × 10⁻¹¹ N·m²/kg²
ℏ
Reduced Planck constant
1.0546 × 10⁻³⁴ J·s
k_B
Boltzmann constant
1.3806 × 10⁻²³ J/K
σ
Stefan-Boltzmann
5.6704 × 10⁻⁸ W/m²/K⁴
H₀
Hubble constant (Planck)
67.4 km/s/Mpc
M☉
Solar mass
1.989 × 10³⁰ kg
R☉
Solar radius
6.957 × 10⁸ m
L☉
Solar luminosity
3.828 × 10²⁶ W
1 AU
Astronomical unit
1.496 × 10¹¹ m
1 pc
Parsec
3.0857 × 10¹⁶ m
1 ly
Light-year
9.461 × 10¹⁵ m
SpaceIntel Astrophysics Suite · Research & Development by Mahesh Naidu · All constants from NIST CODATA 2018 · ΛCDM cosmological parameters from Planck 2018