If you're unsure of how much dry food to feed your particular cat, you can refer to the packaging for guidelines or check with your veterinarian. To give you a general idea, you should consider factors such as your cat's weight and age. Most adult cats (one year and older) can be fed around a quarter of a cup of dry food twice daily. Older cats or ones with special needs however, may need to be fed more often. This would be a case to check in with your veterinarian. Ideally, it's recommended to feed your cat a combination of mostly wet food with dry food mixed in. This is because dry food is higher in carbs and cats don't generally need carbs in their diet. In this case, you can look at the recommended feeding amount on each type of food and half them.