How do they calculate lucky numbers?

Answer 1

According to the website I saw - - they say there is ONE specific method to accurately find all of your lucky numbers - Astro Prime Numbers.
Using the Astro Prime Numbers method, calculations are laid-out in numerical strengths. You can tell exactly how much power there is for each planet, house, and sign. You can see the "harmony" or "dis-harmony" for each of your planets, houses, and signs. -
Here is the site that explains - -
http://www.GetNewLuckyAddress.AstroWishes.com

Answer 2

Call me cynical, but probably a random number generator (or some sort of process that resembles one).