We are a family of 7: I have cooked around 5lbs of chicken thighs (12 pieces), made honey sesame chicken and around 5lbs of chicken breast (8 pieces), made Mongolian chicken. (Chicken purchase from COSTCO) Both did not hit the max capacity line, with ALOT more room. Ingredients should not exceed the max line in pot. FYI- If browning chicken first you should brown in batches for best results. I have not cooked my roast yet. This will be my next venture. Roast would follow same suit, as long as it does not exceed max line. I buy my roast from COSTCO too and buy about 6lbs +. This is 2 roast and I would definitely say they would fit. THE POT IS RATHER LARGE. Hope this helps.