How do I calculate my dog's daily calorie needs?

Our calorie calculator uses the AAFCO Maintenance Energy Requirement (MER) formula: RER × activity multiplier. RER = 70 × (weight in kg)^0.75. The multiplier adjusts for neuter status, activity level, and life stage.

How much should I feed my dog each day?

The amount depends on your dog's weight, activity level, neuter status, and the calorie density of their food. Our calculator shows both the daily calorie target and the grams of food needed based on your specific dog food's kcal/kg.

What's the difference between RER and MER for dogs?

RER (Resting Energy Requirement) is the baseline energy a dog needs at complete rest — no activity, no growth, no pregnancy. Calculated as 70 × weight(kg)^0.75, it's the minimum energy for vital functions like breathing, circulation, and body temperature regulation. MER (Maintenance Energy Requirement) adjusts RER for real life: MER = RER × activity factor. A neutered adult dog's activity factor is 1.6; an active puppy's is 3.0. MER is the number you actually use to determine daily food portions. Our calculator shows both values so you understand the full picture.

How many calories should I feed my puppy?

Puppies have much higher energy requirements than adult dogs. A puppy under 4 months needs approximately 3× their RER — that's nearly double an adult dog's calorie needs per kg of body weight. From 4 months to adulthood, the multiplier drops to 2× RER. Because puppies are growing rapidly, they need frequent meals (3-4 per day until 6 months) and calorie-dense nutrition. Our calculator adjusts for your puppy's age to give a calorie target appropriate for their growth stage. Always monitor body condition and adjust — the calculator provides a starting point, not an absolute rule.

Should I feed my dog before or after a walk?

Veterinarians recommend feeding your dog after a walk, not before — and waiting at least 30-60 minutes after exercise before feeding. The primary reason is bloat (Gastric Dilatation-Volvulus or GDV) prevention: exercising on a full stomach increases the risk of life-threatening stomach twisting, especially in large, deep-chested breeds (Great Danes, German Shepherds, Standard Poodles, Boxers). Bloat has a mortality rate of 10-30% even with emergency surgery. Other reasons to feed after: dogs digest better when resting (blood flow stays with digestion rather than muscles), post-exercise feeding helps with training reinforcement, and a post-walk meal signals relaxation. If you must feed before exercise, wait at least 2 hours, or feed half the portion 2+ hours before and the rest after. Smaller dogs have lower GDV risk but the same digestion principles apply.

Why is my dog always hungry?

Dogs have a strong evolutionary drive to eat whenever food is available — their wild ancestors didn't know when the next meal would come. Common reasons for excessive hunger include: the food lacks sufficient protein or fiber (dogs feel fuller on high-protein, high-fiber diets); feeding too little for their activity level (try our calorie calculator for an accurate target); medical conditions like diabetes, Cushing's disease, hyperthyroidism, or exocrine pancreatic insufficiency (EPI) — these cause real physiological hunger; intestinal parasites that steal nutrients; boredom or anxiety that manifests as food-seeking behavior; and certain medications like prednisone that increase appetite. If your dog is eating the right amount but constantly begging, try splitting meals into 2-3 smaller portions, adding low-calorie vegetables (green beans, carrots) as fillers, using slow-feeder bowls, and increasing exercise. If you've ruled out underfeeding and your dog is losing weight despite eating normally, see a vet — this is a red flag for metabolic disease.

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Dog Calorie Calculator: How Much Should Your Dog Eat

Calculate your dog's exact daily calorie needs using the AAFCO MER formula. Get feeding amounts for any dog food brand.

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4 个月至成年幼犬	系数 2
成年，已绝育（典型）	系数 1.4
成年，未绝育	系数 1.6
减重 / 肥胖倾向	系数 1
活跃 / 工作犬	系数 5

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Key Knowledge

What Is RER?

Resting Energy Requirement (RER) is the baseline energy a dog needs at rest — no activity, no growth, no pregnancy. RER = 70 × weight(kg)^0.75. This formula, developed through metabolic studies, is the foundation of all dog feeding calculations (AAFCO, 2023).

Source: AAFCO Guidelines

What Is MER?

Maintenance Energy Requirement (MER) adjusts RER for real-life energy needs: MER = RER × activity factor. A neutered adult dog needs MER = RER × 1.6; an active puppy under 4 months needs RER × 3.0. AAHA provides the standard activity multipliers.

Source: AAHA Canine Life Stage Guidelines

Why Use AAFCO-Based Formulas?

AAFCO (Association of American Feed Control Officials) establishes nutrient profiles that all commercial pet foods sold in the US must meet. Our MER calculator aligns with AAFCO standards, ensuring your feeding plan matches what veterinary nutritionists define as adequate daily intake.

Source: AAFCO Dog Food Nutrient Profiles

How Much Should I Feed My Dog?

After calculating your dog's daily calorie target (MER), divide by your dog food's calorie density (kcal/kg or kcal/cup, printed on the bag). Example: a 20 kg neutered adult dog needs ~740 kcal/day. If your kibble is 3,700 kcal/kg, feed ~200 g/day. Always monitor body condition and adjust.

Source: AAHA Weight Management Guidelines

Data verified by petsMetrics using peer-reviewed veterinary sources. Citations: ASPCA, AVMA, AAFP. Last reviewed: 2026.

The Science Behind the Dog Calorie Calculator

This calculator uses the AAFCO Maintenance Energy Requirement (MER) formula: MER = RER × activity factor, where RER = 70 × weight(kg)^0.75. The exponent 0.75 (Kleiber's Law) describes how metabolic rate scales with body mass across species. Activity factors — from 1.0 for weight loss to 3.0 for young puppies — are defined by AAHA 2021 Canine Life Stage Guidelines. The result is a science-backed daily calorie target that adapts to your dog's age, activity level, and body condition.

References: AAFCO Dog Food Nutrient Profiles (2023); AAHA Canine Life Stage Guidelines (2021)— via petsMetrics

Predict Your Puppy's Adult Size

Knowing your dog's calorie needs is great — but how big will they get? Use our Puppy Growth Predictor to estimate adult size and adjust feeding accordingly.

Predict Adult Size →