Learn how to read commercial dog food labels from Pet Health Questions Pro. I understand it's not practical for most people to never use commercial dog food ever again. Although not best case, you can use it sparingly for maybe a few meals during the week.
Use the 'Varying Needs Calorie Chart' to quickly calculate the perfect-portions for your dog if you have colder than usual winters, hotter than usual summers, your dog is still a pup or your dog is overweight.