Here's how my feed worked out for 4 chicks (RIR, EE, 2 BR). Two of my chicks are about 6 days older than the other two, due to the way they arrived at the feedstore in a split order. 25# bag medicated chick starter - lasted until the chicks were 8/9 weeks old. 50# bag grower crumbles - I still have about 8-10 lbs left, and the chicks are now 20/21 weeks old. So, the 4 chickens should be good with this feed until they start laying. I am feeding organic feed, which my local feed store says typically delays laying - so I am not expecting them to lay until at least 24 weeks or longer. The feed bags worked out just about perfectly - supplemented by free ranging, sunflower seeds from my garden, pumpkin seeds, various food scraps, and a little bit of oatmeal.