How is the calorie estimate calculated?

In two steps, the way vets do it. First the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75 — the calories a dog burns at rest. Then daily calories = RER × a life-stage or activity factor (about 1.6 for a typical neutered adult, 1.8 intact, 1.2–1.4 for a weight-prone or senior dog, 2–3 for active and working dogs, 2–3 for growing puppies). This is the standard from the Merck Veterinary Manual and the AAHA nutrition guidelines.

Cups or grams — which is more accurate?

Grams, on a kitchen scale. Every bag lists its energy as “metabolizable energy” (kcal per cup or per kg); dividing your dog’s daily calories by that gives the portion. A measuring cup is fine, but eyeballing “a scoop” is the single most common cause of overfeeding — weighing the food is the reliable way.

My dog needs to lose weight — what do I enter?

Enter your dog’s ideal / target weight, not its current weight, and pick the weight-loss profile. Feed to roughly the ideal-weight resting need and aim to lose no more than about 1–2% of body weight per week. Weight-loss plans should always be vet-supervised to rule out medical causes and keep it safe.

How do treats fit in?

Treats, chews, dental sticks and table scraps should be no more than 10% of the day’s calories (AAHA and WSAVA). Subtract that 10% from the meal allowance rather than adding it on top, so the day still totals the target — treats on top are how weight creeps up.

The number seems off for my dog.

That’s expected — it’s a starting point, not a prescription. Research shows an individual dog’s real maintenance need can vary by roughly ±50% with metabolism, breed, coat, temperature and true activity. Body condition matters more than any calorie figure: aim for a 4–5/9 body condition score (ribs easily felt, a visible waist, a tucked belly), and if your dog is gaining, feed less; if it’s ribby, feed more. Feed the dog in front of you, not the chart.

Interactive tool · Feeding your dog

Dog Feeding Calculator

How much should you feed your dog? Enter your dog’s weight and how active it is for a daily calorie range — built on the vet formula (resting need × a life-stage factor) — plus how to turn that into a real bowl. Estimates only: your vet is the source of truth.

Enter your dog’s weight and pick a profile above for a daily calorie estimate. (The live result needs JavaScript — with it off, use the formula below.)

How much should I feed my dog?

Vets work it out in two steps. First, the Resting Energy Requirement (RER) — what a dog burns just existing: RER = 70 × (weight in kg)^0.75. Then the day’s calories are RER × a life-stage or activity factor — about 1.6 for a typical spayed/neutered adult, 1.8 for an intact one, 1.2–1.4 for a couch-potato or senior, 2–3 for active and working dogs, and 2–3 for growing puppies. To turn calories into a bowl, divide by your food’s energy (the “kcal per cup” or “kcal per kg” printed on the bag).

The daily-calorie factors

Neutered adult — 1.6 × RER (the default for most pets).
Intact adult — 1.8 × RER.
Inactive / weight-prone — 1.2–1.4 × RER.
Active / working — 2–3 × RER (more for hard endurance work).
Weight loss — ~1.0 × RER of the target weight, vet-supervised.
Puppy — 3 × RER under 4 months, 2 × RER from 4 months to adult. Large- and giant-breed puppies: don’t overfeed or add calcium — keeping them lean (body condition 4/9) on a large-breed growth diet protects developing joints. Follow your vet’s guidance.
Senior — 1.2–1.4 × RER; judge by body condition, not age alone.

A starting point, not a rule

These numbers are a starting ration, then you adjust to the dog in front of you. An individual dog’s real need can vary by roughly ±50% with metabolism, breed, coat and true activity, so the single most important gauge is body condition: aim for a 4–5 on the 9-point score — ribs easily felt, a visible waist, a tucked belly. If your dog is gaining, feed a little less; if it’s ribby, feed a little more. Growth, pregnancy, weight loss and any illness change the math and should be guided by your vet.

Frequently asked questions

How is the calorie estimate calculated?: In two steps, the way vets do it. First the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75 — the calories a dog burns at rest. Then daily calories = RER × a life-stage or activity factor (about 1.6 for a typical neutered adult, 1.8 intact, 1.2–1.4 for a weight-prone or senior dog, 2–3 for active and working dogs, 2–3 for growing puppies). This is the standard from the Merck Veterinary Manual and the AAHA nutrition guidelines.
Cups or grams — which is more accurate?: Grams, on a kitchen scale. Every bag lists its energy as “metabolizable energy” (kcal per cup or per kg); dividing your dog’s daily calories by that gives the portion. A measuring cup is fine, but eyeballing “a scoop” is the single most common cause of overfeeding — weighing the food is the reliable way.
My dog needs to lose weight — what do I enter?: Enter your dog’s ideal / target weight, not its current weight, and pick the weight-loss profile. Feed to roughly the ideal-weight resting need and aim to lose no more than about 1–2% of body weight per week. Weight-loss plans should always be vet-supervised to rule out medical causes and keep it safe.
How do treats fit in?: Treats, chews, dental sticks and table scraps should be no more than 10% of the day’s calories (AAHA and WSAVA). Subtract that 10% from the meal allowance rather than adding it on top, so the day still totals the target — treats on top are how weight creeps up.
The number seems off for my dog.: That’s expected — it’s a starting point, not a prescription. Research shows an individual dog’s real maintenance need can vary by roughly ±50% with metabolism, breed, coat, temperature and true activity. Body condition matters more than any calorie figure: aim for a 4–5/9 body condition score (ribs easily felt, a visible waist, a tucked belly), and if your dog is gaining, feed less; if it’s ribby, feed more. Feed the dog in front of you, not the chart.

Share this Share on WhatsApp