How long does a bag of cat food last?

A cat’s feeding amount is generally based on its weight. A 4 kg adult British Shorthair eats about 60 g of food per day, so a 500 g bag of cat food typically lasts about a week.

However, because cats vary greatly as individuals, there is roughly a 50% margin either way. A less active, smaller cat may eat less than that in a day. On the other hand, an overweight cat that needs to lose weight should be fed less, so a 500 g bag could last 1 to 2 weeks.