Hubble's Law & Redshift Calculator

Recession velocity and approximate distance of a galaxy from its redshift (low-z Hubble law).

How to use the Hubble's Law & Redshift Calculator

Enter or select: Redshift z, Hubble constant H₀.
The results (Velocity (relativistic Doppler), Velocity (cz), Distance (v/H₀), Distance) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

v = H₀ · d
v ≈ c·z (z ≪ 1)

About this tool

Valid for nearby galaxies (z < ~0.1); larger redshifts require a full cosmological model.