How the calorie calculation works
This calculator uses the formula recommended by the World Small Animal Veterinary Association (WSAVA) and the American Animal Hospital Association (AAHA).
Step 1 — Resting Energy Requirement (RER)
RER is the number of calories your dog burns at complete rest — just to keep organs running. The formula is:
RER = 70 × (body weight in kg)0.75
This power function (³⁄₄ exponent) is more accurate across the wide weight range of dogs than a simple linear formula, because smaller dogs burn more calories per kg than larger dogs.
Step 2 — Maintenance Energy Requirement (MER)
MER is the realistic daily requirement. It multiplies RER by a factor that accounts for your dog's life stage, activity, and reproductive status.
| Life stage / status | Typical MER multiplier |
|---|---|
| Puppy under 4 months | 3.0 × RER |
| Puppy 4–12 months | 2.0 × RER |
| Intact adult | 1.8 × RER |
| Neutered adult | 1.6 × RER |
| Sedentary or weight-loss | 1.0 × RER |
| Active / working dog | 2.0–5.0 × RER |
| Senior (low activity) | 1.2 × RER |
Important: These are starting estimates, not prescriptions. Individual metabolism varies by 20–30%. Re-check your dog's body condition every 2 weeks and adjust portions if they are gaining or losing weight unintentionally.
How to use the result
- Find the calories-per-cup (or per gram) figure on your dog's food label.
- Divide your dog's daily calorie target by that number — that's the daily portion.
- Remember that treats and table food count. Treats should not exceed 10% of daily calories.
- Always provide fresh water alongside food.
Frequently asked questions
Why does my food bag say a different amount?
Pet food labels use generous estimates that work for the "average" intact, active dog. Most house pets are neutered and less active, so following the bag often leads to weight gain. Calorie-based calculation is more accurate for your individual dog.
Should I feed once or twice a day?
Adult dogs do best with two meals daily — splitting the calorie target in half. Puppies under 6 months need three to four meals. Single-meal feeding is linked to higher rates of bloat in deep-chested breeds.
How quickly should an overweight dog lose weight?
A safe rate is 1–2% of body weight per week. Faster loss risks muscle wasting and nutritional deficiencies. For severe obesity, work with a veterinarian on a structured plan, which may include a prescription weight-loss diet.
Do I need to change calories for cold weather?
Indoor dogs do not. Outdoor working dogs or dogs that live primarily outside in cold climates may need 10–30% more calories in winter to maintain body temperature. Always re-assess body condition rather than guessing.
Is this calculator suitable for pregnant or lactating dogs?
No. Pregnant dogs in the last trimester and lactating dogs have dramatically higher calorie needs (up to 4× RER for lactation). These cases require a veterinarian-supervised plan.