How much should they actually eat?
Bag instructions overfeed by an average of 25%. This calculator uses the veterinary RER (Resting Energy Requirement) formula to give you a real, evidence-based daily portion — plus what it'll cost monthly.
The math
We start with RER (Resting Energy Requirement) = 70 × (weight_kg)^0.75. Then we multiply by an MER factor based on life stage, neutering, body condition, and activity — values pulled from the Small Animal Clinical Nutrition textbook used in vet schools. The treat budget is set at 10% of daily calories per AAHA guidelines.