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 an easy way to overfeed; 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.

How many calories does my dog need per day?

Vets estimate it in two steps. First, the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75, the calories a dog burns just staying alive. Then multiply by a life-stage factor to get the daily Maintenance Energy Requirement (MER): about 1.6 for a typical neutered adult, 1.8 for an intact adult, 1.2–1.4 for seniors or dogs prone to weight gain, and 2–3 for working dogs and growing puppies. Example: a 10 kg (22 lb) neutered adult has an RER of about 400 kcal, so roughly 630 kcal per day. Real needs vary widely — up to ±50% — so treat the number as a starting point and adjust to hold a lean 4–5/9 body condition score, per AAHA and WSAVA guidance.

How much should I feed my dog by weight?

Body weight sets the calorie target, and the bag's calorie density turns it into grams. Work out daily calories with the vet formula (RER = 70 × kg^0.75, times an activity factor), then divide by the food's metabolizable energy — printed on every bag as kcal per kg or per cup. Rough adult-maintenance figures: a 5 kg (11 lb) dog needs around 370 kcal a day, 10 kg about 630, 20 kg about 1,050, and 30 kg about 1,400. For a typical dry food at 3,500–4,000 kcal/kg, that works out to roughly 100–380 g of kibble a day across that range. Weigh the portion on a kitchen scale, and let body condition make the final call: ribs easily felt and a visible waist, as AAHA and WSAVA recommend.

How often should I feed my dog?

Two meals a day, about 8–12 hours apart, is the standard for most healthy adult dogs; it steadies energy and appetite, and AAHA feeding guidance favors consistent, measured meals over free-feeding. Puppies need to eat more often: 3–4 small meals a day until about 4 months old, then 2–3 until they reach adult size (toy breeds may need extra meals to guard against low blood sugar). Whatever the schedule, split the same daily calorie total — from the RER × activity-factor formula — across the meals rather than adding a full portion each time. Measured meals also make appetite changes, one of the earliest signs of illness, easy to spot. Deep-chested breeds should avoid one big daily meal and hard exercise right after eating.

Interactive tool · Feeding your dog

Dog Feeding Calculator: daily calories and cups from your dog’s weight

A daily calorie range from the standard RER formula vets start with (resting need × a life-stage factor); then your food’s kcal per cup turns it into a real bowl. Your dog’s waistline makes the final call, and 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 an easy way to overfeed; 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.
How many calories does my dog need per day?: Vets estimate it in two steps. First, the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75, the calories a dog burns just staying alive. Then multiply by a life-stage factor to get the daily Maintenance Energy Requirement (MER): about 1.6 for a typical neutered adult, 1.8 for an intact adult, 1.2–1.4 for seniors or dogs prone to weight gain, and 2–3 for working dogs and growing puppies. Example: a 10 kg (22 lb) neutered adult has an RER of about 400 kcal, so roughly 630 kcal per day. Real needs vary widely — up to ±50% — so treat the number as a starting point and adjust to hold a lean 4–5/9 body condition score, per AAHA and WSAVA guidance.
How much should I feed my dog by weight?: Body weight sets the calorie target, and the bag's calorie density turns it into grams. Work out daily calories with the vet formula (RER = 70 × kg^0.75, times an activity factor), then divide by the food's metabolizable energy — printed on every bag as kcal per kg or per cup. Rough adult-maintenance figures: a 5 kg (11 lb) dog needs around 370 kcal a day, 10 kg about 630, 20 kg about 1,050, and 30 kg about 1,400. For a typical dry food at 3,500–4,000 kcal/kg, that works out to roughly 100–380 g of kibble a day across that range. Weigh the portion on a kitchen scale, and let body condition make the final call: ribs easily felt and a visible waist, as AAHA and WSAVA recommend.
How often should I feed my dog?: Two meals a day, about 8–12 hours apart, is the standard for most healthy adult dogs; it steadies energy and appetite, and AAHA feeding guidance favors consistent, measured meals over free-feeding. Puppies need to eat more often: 3–4 small meals a day until about 4 months old, then 2–3 until they reach adult size (toy breeds may need extra meals to guard against low blood sugar). Whatever the schedule, split the same daily calorie total — from the RER × activity-factor formula — across the meals rather than adding a full portion each time. Measured meals also make appetite changes, one of the earliest signs of illness, easy to spot. Deep-chested breeds should avoid one big daily meal and hard exercise right after eating.

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