RER (Resting Energy Requirement) is the baseline energy your dog needs at rest — just to maintain vital functions like breathing, circulation, and body temperature. It's calculated using the formula:
RER = 70 × (body weight in kg)0.75
This formula accounts for the fact that smaller animals have higher metabolic rates per kilogram than larger ones. For example, a 10 kg dog has an RER of about 400 kcal, while a 30 kg dog's RER is around 900 kcal — not 3× as much, but about 2.25×.

MER (Maintenance Energy Requirement) = RER × activity factor. While RER is the resting baseline, MER accounts for your dog's actual lifestyle — activity level, life stage, spay/neuter status, and body condition goals. An active working dog may need 3–5× their RER, while a sedentary senior dog may only need 1.1–1.4× RER. Our calculator combines all these factors to give you an accurate MER.

Puppies need significantly more energy per pound of body weight than adult dogs because they're growing rapidly. A puppy aged 0–4 months may need 3× their RER, while puppies 4–12 months need about 2× RER. Large breed puppies have slightly lower energy density needs than small breeds to prevent overly rapid growth, which can stress developing joints. Always consult your veterinarian for a personalized puppy feeding plan.

After spaying or neutering, a dog's metabolic rate typically drops by 20–30% due to hormonal changes. This means a spayed/neutered dog needs fewer calories to maintain the same weight. Our calculator reduces the MER factor by approximately 0.2–0.3 for altered dogs. If you've recently had your dog spayed or neutered, monitor their weight closely and adjust food intake as needed to prevent unwanted weight gain.

Low: Mostly indoor, short potty walks only, sleeps much of the day — typical for senior or very laid-back dogs.
Normal: One or two 20–30 minute walks daily, some playtime — the average companion dog.
Active: Long walks, runs, fetch sessions, or hiking several times a week — common for sporting breeds.
High Energy: Working dogs (herding, hunting, service), daily intense exercise, agility training, or running miles per day. If unsure, choose the level below your estimate — it's safer to slightly underfeed than overfeed.

For weight loss, select the "Weight Loss" goal in our calculator — this applies roughly 80% of the maintenance MER. Combine reduced calorie intake with gradually increased exercise. Aim for 1–2% body weight loss per week. Always have your veterinarian rule out underlying conditions (like hypothyroidism) before starting a weight loss program. Use a kitchen scale to measure portions precisely — even small overestimates add up over time.

Yes — breed-specific traits affect energy needs. High-energy breeds (Border Collies, Huskies, Jack Russells) often fall into the "Active" or "High Energy" category. Brachycephalic breeds (Bulldogs, Pugs) may expend more energy just breathing, slightly increasing needs. Giant breeds (Great Danes, Mastiffs) have slower metabolisms per pound. Our activity level and life stage selections help account for these differences, but individual variation exists — monitor your dog's body condition score (BCS) and adjust accordingly.

Puppies (0–4 months): 3–4 small meals daily to support rapid growth and prevent hypoglycemia.
Puppies (4–12 months): 2–3 meals daily.
Adult dogs: 1–2 meals daily — splitting into two meals may reduce begging behavior and bloat risk in large breeds.
Senior dogs: 2 smaller meals for easier digestion.
Always divide the total daily calories by the number of meals. Free-feeding (leaving food out all day) is not recommended as it can lead to overeating and obesity.

Yes — this calculator gives you a daily calorie target that applies regardless of food type. For homemade diets, you'll need to calculate the caloric content of your recipe (ingredient by ingredient). Consult a board-certified veterinary nutritionist to ensure your homemade diet is complete and balanced. Homemade diets that are not properly formulated can lead to serious nutritional deficiencies over time.

This calculator uses the veterinary-standard RER/MER methodology recommended by organizations like AAHA and WSAVA. It provides a scientifically grounded estimate suitable for most dogs. However, individual variation exists — factors like breed, genetics, underlying health conditions, and environment all influence actual needs. Use this as a starting point, then monitor your dog's body condition score (BCS) and weight trends, adjusting intake by 5–10% as needed. For dogs with medical conditions, always consult your veterinarian.