About the Hubble's Law Calculator
Calculate a galaxy's recession velocity or distance using v = Hโ ร d.
What it is
Edwin Hubble's 1929 observation that distant galaxies recede faster the farther away they are became one of the first pieces of evidence for an expanding universe. This tool applies that relationship, v = Hโ ร d, letting you solve for either recession velocity or distance, with the Hubble constant adjustable across its real measured range to reflect ongoing scientific debate.
Features
Solve for distance or velocity
Switch direction depending on which quantity you already know.
Adjustable Hubble constant
Slide across the real measured range (67โ73 km/s/Mpc) to see the Hubble tension's effect on results.
Unit handling for Mpc/ly
Enter distance in megaparsecs, million light-years, or light-years.
v/c comparison
See recession velocity as a fraction of the speed of light for very distant galaxies.