How the dog food calculator works
We start with your dog’s resting energy requirement (RER), the energy needed at complete rest: 70 × body weight in kilograms raised to the power of 0.75. That number is then multiplied by a life-stage factor. A neutered adult uses about 1.6 × RER, while a puppy under four months can need around 3 × RER.
To turn calories into cups, we divide by the kcal per cup on your food. That last input matters more than most people expect: two foods can differ by 100 calories per cup, which changes the portion by nearly a third.
Using the result without overthinking it
Treat the daily calories as a starting point for two to three weeks, not a permanent prescription. Weigh your dog monthly and adjust portions by about 10% if the scale drifts. A dog at a healthy weight has a visible waist from above and ribs you can feel with light pressure.
Treats count toward the total. Keep them under 10% of daily calories so the complete food still supplies the vitamins and minerals your dog needs.
- Split the daily amount into two meals for most adults.
- Puppies usually do better with three to four smaller meals.
- Transition to a new food over 7-10 days to avoid stomach upset.
- Do not ration water, even when managing weight.
When to ask your vet
Use veterinary guidance for pregnant or nursing dogs, dogs with kidney, heart or endocrine disease, and any dog that needs to lose more than a few pounds. Rapid weight change, a sudden change in appetite, or vomiting and diarrhea that lasts more than a day deserves a call.