Dog Calorie Calculator

Vets estimate a dog’s daily calories in two steps: first the resting energy requirement (RER), the energy needed at rest, then a multiplier for life stage and activity. This calculator uses that method with selected starting multipliers from the AAHA nutrition guidelines, then turns the result into cups using the calorie figure on the food bag. Treat it as a starting point, not a diagnosis.

How to use this tool

1. Enter your dog’s current weight and pick pounds or kilograms.
2. Choose the life stage and activity level; for supervised weight loss, also enter the vet-approved target weight.
3. Enter the kcal per cup from the food bag and the number of meals.
4. Leave the treat box ticked to reserve 10% of calories for treats.

Formula

RER = 70 × (body weight in kg)^0.75; daily calories = RER × multiplier

Multipliers: 1.6 for a neutered adult, 1.8 for an intact adult, 1.2 for inactive or obesity-prone dogs (range 1.0–1.2), 2.0 for light work (range 1.6–2.0), 3.0 for puppies under 4 months and 2.0 from 4 months to adult. For weight loss the RER is worked out at the target weight and multiplied by 1.0. Underweight dogs need an individual veterinary feeding plan. Cups per day = calories for the main food ÷ kcal per cup.

Example

A 30 lb (13.61 kg) neutered adult dog has an RER of 70 × 13.61^0.75 ≈ 496 kcal, so its daily need is 1.6 × 496 ≈ 794 kcal. Keeping 10% (79 kcal) for treats leaves 714 kcal from food. With a food that has 350 kcal per cup, that is about 2.04 cups a day, or 1.02 cups at each of two meals.