Cost follows calories, not the bag price
A premium bag that costs twice as much might still be cheaper per day if it’s more calorie-dense — or more expensive if your dog needs more cups. The honest way to compare foods is cost per 1,000 kcal, which is why this calculator shows it. Start from your dog’s daily calorie need (resting energy × a life-stage factor), price the cups against the real bag economics, and the monthly number falls out naturally.
Why size changes everything
Calories scale with body weight, but not in a straight line — a dog twice as heavy doesn’t eat twice as much. Still, a large or active dog eats several times more than a small senior, so two owners feeding the same brand spend wildly different amounts. Puppies under four months need the most per kilogram (about 3× resting), working dogs about 2.5×, while a neutered senior needs only about 1.4× — and all of that shows up directly in the monthly total.
Frequently asked questions
- How much does dog food cost per month?
- It depends on your dog’s size, age, and activity, and on how expensive the food is. A typical medium adult dog eating a mid-priced dry food might cost $30–60/month; a large active dog can run $80–120/month, and a small senior far less. This calculator turns your dog’s calorie needs and your food’s real price into a monthly figure rather than guessing.
- How is the cost calculated?
- We work out your dog’s daily calories (resting energy requirement × a life-stage factor), divide by the calories per cup printed on your bag to get cups per day, then price that using your bag’s real economics — bag price ÷ bag weight in cups. That gives cost per day, which scales to month and year, plus how many days one bag lasts.
- How long does a bag of dog food last?
- A bag lasts until your dog has eaten its total calories. The calculator figures out how many cups are in the bag (from its weight) and divides by your dog’s cups per day. A 30 lb bag might last a small dog two months but a large active dog under three weeks. Knowing “days per bag” also makes it easy to compare foods by cost per day, not shelf price.
- Why does the same food cost owners different amounts?
- Because big dogs eat far more than small ones, and puppies, working dogs, and intact adults need more calories per kilogram than neutered seniors. Two owners feeding the identical brand can therefore spend very different amounts — which is why estimating from your own dog’s calorie needs, rather than a one-size average, is more accurate.
⚠️ A planning estimate for healthy dogs. Real intake varies with metabolism, breed, and activity — monitor body condition and adjust. For puppies, pregnancy, or any health condition, follow your vet’s feeding guidance.