Hubble Law Distance Calculator

Your details

Choose whether you know the distance and want the velocity, or know the velocity and want the distance.
Proper distance to the galaxy in the selected unit.
Planck 2018 gives 67.4; SH0ES (Cepheid-based) gives 73.0. Try both to explore the Hubble Tension.
km/s/Mpc
Recessional velocitySub-relativistic
6,740km/s

How fast the galaxy is moving away from us

Velocity as fraction of c0.022482
Distance100Mpc
Distance326.147million ly
Hubble time14.51Gyr
Hubble radius4,447.96Mpc
Recession speed (fraction of c)0.022482

Galaxy distance: 100.0 Mpc - recessional velocity: 6,740 km/s

  • At 100.0 Mpc (about 326 million light-years), this galaxy recedes at 6,740 km/s, or 2.25% of the speed of light.
  • This recession speed is well within the regime where Hubble's linear approximation (v = H0 d) is accurate to better than 1%.
  • The Hubble radius for H0 = 67.4 km/s/Mpc is 4448 Mpc: objects beyond this distance recede faster than light.
  • The Hubble time (1/H0) is 14.5 billion years, a rough upper bound on the age of the universe.

Next stepFor redshifts z > 0.1, use a cosmological distance calculator that accounts for the expansion history. For z < 0.1, Hubble's linear law is an excellent approximation.

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