Enter the velocity (km/s) and the Hubble Constant (km/s/Mpc) into the Redshift Distance Calculator. The calculator will evaluate and display the Redshift Distance. 

Redshift Distance Formula

The following formula is used to calculate the Redshift Distance. 

RD = v / H

  • Where RD is the Redshift Distance (Mpc)
  • v is the velocity (km/s) 
  • H is the Hubble Constant (km/s/Mpc) 

How to Calculate Redshift Distance?

The following example problems outline how to calculate Redshift Distance.

Example Problem #1:

  1. First, determine the velocity (km/s). 
    • The velocity (km/s) is given as: 150.
  2. Next, determine the Hubble Constant (km/s/Mpc). 
    • The Hubble Constant (km/s/Mpc) is provided as: 74.
  3. Finally, calculate the Redshift Distance using the equation above: 

RD = v / H

The values given above are inserted into the equation below and the solution is calculated:

RD = 150 / 74 = 2.02 (Mpc)


Example Problem #2: 

For this problem, the variables needed are provided below:

velocity (km/s) = 200

Hubble Constant (km/s/Mpc) = 69.8

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

RD = v / H = ?