Cosmology Calculator
Estimate recessional velocity from Hubble law, evaluate Friedmann expansion behavior, and compute the Universe critical density with SI or astronomical units.
Use Cases
- - Intro cosmology homework and exam practice
- - Quick checks for expansion and redshift intuition
- - Comparing cosmological parameter assumptions
- - Building intuition before simulation workflows
Formulas Used
- Hubble law: v = H0 d
- Low-z redshift: z ~= v / c
- Friedmann: H(a)^2 = H0^2 [Omega_r a^-4 + Omega_m a^-3 + Omega_Lambda + Omega_k a^-2]
- Critical density: rho_c = 3H0^2 / (8*pi*G)