# How is Hubble's Constant calculated?

Dec 15, 2015

The formula $H = \frac{v}{d}$ can be used.

#### Explanation:

The Hubble Constant can be used to determine the size and age of the universe, and the rate at which the universe is expanding.

Finding a true value for the Hubble Constant is complicated.

Two measurements are necessary.

1. Spectroscopic Observations : indicate galaxy's radial velocity [v]
2. Galaxy's Distance From Earth [d]

Then, the following formula is used.

$H = \frac{v}{d}$

The units of the calculation are kilometers per second per megaparsec.