Adult dogs have different caloric needs than puppies. This calculator uses the RER (Resting Energy Requirement) formula used by veterinary nutritionists.
Calculate the perfect daily food portion for your adult dog — by weight, age, and activity level.
Adult dogs have different caloric needs than puppies. This calculator uses the RER (Resting Energy Requirement) formula used by veterinary nutritionists.
Overfeeding is the most common nutrition mistake — over 50% of US dogs are overweight or obese, significantly increasing risk of diabetes, joint disease, and cancer while reducing lifespan by up to 2 years. Bag feeding guides are notoriously generous.
This calculator uses the Resting Energy Requirement (RER) formula: RER = 70 × (body weight in kg)0.75. This gives the calories needed at complete rest, then we multiply by an activity factor to account for your dog's lifestyle. The result is divided by your food's kcal/cup for a practical daily cup amount.
Body condition scoring is more important than any calculation. Monthly, run your hands along the ribcage with light pressure — you should feel each rib individually. From above, a visible waist should be apparent. From the side, a slight abdominal tuck should be visible. If ribs are impossible to feel, reduce food by 10%. If ribs are visible, increase by 10%. Adjust gradually and reassess monthly.
Treats are a hidden calorie source that derails many weight management efforts. A single milk bone biscuit contains approximately 40 calories — equivalent to 3-4 tablespoons of kibble. Training treats given generously during a session can add 100-200+ calories. Measure treats and subtract their calorie equivalent from the daily food allowance. Low-calorie options (carrot pieces, green beans) minimize the math required.
Hunger signals in dogs are often behavioral rather than physiological. Dogs who have been fed more than needed develop a baseline expectation. If your dog is at a healthy body condition score and passes the rib check, they are not underfed regardless of mealtime behavior. High-fiber foods can increase satiety — ask your vet about options if hunger behavior is problematic.
Twice daily is generally recommended. Once-daily feeding can lead to longer periods of stomach acidity between meals (associated with bilious vomiting — the yellow foam some dogs produce in the morning), and twice-daily feeding reduces bloat risk in deep-chested breeds. Twice daily also makes appetite changes easier to notice.
Senior dogs (over 7 years for most breeds) typically need 10-20% fewer calories due to decreased metabolism and activity. However, some senior dogs need more if losing muscle mass. Monitor body condition more frequently in senior dogs and discuss adjustments with your vet at each annual exam.
Reduce daily intake by 10-15% and reassess body condition monthly. Never reduce by more than 20% without veterinary supervision. Weight loss should be gradual — approximately 1-2% of body weight per month is appropriate. Rapid weight loss causes muscle loss rather than fat loss. Exercise increases help but food management is the primary lever.