HI Jackie
It really depends on thier lifesstyle and if they are active cats or not. I would say that most indoor cats would need to eat less than the outside cats if they are not getting as much excerise. Or if they are older and less active. If all is ok at the vets and weight gain or loss is not due to any illness then for the average outside cat two pouches a day is norm and can be fed in two meals or split up in day.
Cats do tend to like to have more small meals than big ones.
Section taken from FAB web site -
http://www.fabcats.org/owners/feeding/info.html Many cats control their energy intake regardless of differences in the energy density, moisture content and texture of the diet. In general cats will normally eat the amount of food required to satisfy their energy requirements. Cats that hunt for food or are normally outdoors for long periods of time tend to take larger meals, but less of them. However cats readily adapt to different feeding schedules and if set feeding times are used then they will normally adjust food intake to accommodate this. The energy in food is measured in kilocalories (kcal) and is derived from fats, carbohydrates and protein. It is important that the percentage of energy provided by the protein part of the diet is at least 25% of the whole, otherwise the cat's appetite will be satisfied before it has taken in enough protein for its health requirements. Similarly it is also important that the food intake level is sufficient to supply the other necessary nutrients such as fats, carbohydrates, vitamins and minerals.
and from My Moggie web site
http://www.moggies.co.uk/articles/nutrition.html#5How much should I feed my cat?
The first place to start is to look for feeding guidelines on the package, they are an excellent place to start. Remember that these are guidelines only and that your pet's age, activity level and environmental temperatures all have an effect on how much your pet needs. The best method is to weigh your cat regularly and increase the amount of food if your cat appears to be losing weight and decrease the amount if your pet appears to be gaining weight. Many pet stores and most veterinarian offices have scales you can use to weigh your pet.
Young growing pets should be fed two or three times per day, with newly weaned kittens being fed three times a day and older growing kittens being fed twice a day. Adult cats can be fed free choice, once a day or twice a day depending upon the cat and owner preference. Adult dogs or cats that are overweight and are being fed to lose weight should be fed twice a day to help minimize the risk of begging.