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Daily calories and cups from your dog's weight and lifestyle, using the same energy formula vets use.
Vets estimate energy needs from resting energy requirement: 70 times body weight in kilograms raised to the power 0.75, multiplied by a life stage factor. We use that formula, then convert calories to cups at 380 kcal per cup, the middle of the typical dry food range. Your own bag's label is the authority for your dog; weigh your dog monthly while you settle a ration.
Last updated: November 2026. Every calculator on this site shows its method: see how we calculate and verify.