Hubble Law Calculator

Work out hubble law instantly with clear inputs, formula shown and shareable results.

About Hubble Law Calculator

Hubble's law states v = H0.d, so a galaxy 100 Mpc away recedes at about 7000 km/s if H0 is 70 km/s/Mpc. The reciprocal of H0 is the Hubble time, 13.97 billion years - close to the age of the universe because the expansion rate has not changed enormously over cosmic history.

Formulas

Hubble's law

v = H0 x d

Hubble time

t(H) = 1 / H0, about 977.8 / H0 in Gyr

Worked example

With the default values below, Hubble Law Calculator returns Recession Velocity of 7,000.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Distance to the galaxyminimum 0 Mpc: 100 Mpc
Hubble constantminimum 0 km/s/Mpc: 70 km/s/Mpc

Results

Recession Velocity: 7,000.0 km/s
Approximate Redshift: 0.02335
Hubble Time: 13.969 Gyr
Distance In Light Years: 3.2616 × 10⁸

Step by step

1Values used
2Hubble's law
3Hubble time
4Recession Velocity= 7,000.0 km/s
5Approximate Redshift= 0.02335
6Hubble Time= 13.969 Gyr
7Distance In Light Years= 326,156,000.0000

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 5 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is the Hubble constant disputed?

Because supernova distance ladders give about 73 km/s/Mpc while cosmic microwave background fits give about 67. The gap is the Hubble tension.

Does Hubble's law mean we are at the centre?

No. Every observer sees the same recession pattern, because space itself expands rather than galaxies flying away from one point.