Dog Calorie Calculator
Enter your dog’s weight and lifestyle to see daily calories, a weight-loss target if needed, and how many calories can go to treats.
A typical neutered adult dog needs about 1.6 times its resting energy requirement (RER), where RER = 70 × body weight in kg to the power 0.75. A 22 lb (10 kg) dog has an RER of about 394 kcal, so it needs roughly 630 kcal a day. Treat this as a starting point; needs vary by about 30%.
Dog calorie chart by weight
Daily calories for healthy adult dogs, calculated with the same formula as the calculator. To turn calories into cups, use our dog food calculator.
| Weight | RER | Neutered× 1.6 | Intact× 1.8 | Low activity× 1.4 |
|---|---|---|---|---|
| 5 lb | 129 | 207 | 233 | 181 |
| 10 lb | 218 | 348 | 392 | 305 |
| 20 lb | 366 | 585 | 659 | 512 |
| 30 lb | 496 | 794 | 893 | 694 |
| 40 lb | 615 | 985 | 1,108 | 862 |
| 50 lb | 727 | 1,164 | 1,309 | 1,018 |
| 60 lb | 834 | 1,335 | 1,501 | 1,168 |
| 70 lb | 936 | 1,498 | 1,685 | 1,311 |
| 80 lb | 1,035 | 1,656 | 1,863 | 1,449 |
| 90 lb | 1,131 | 1,809 | 2,035 | 1,583 |
| 100 lb | 1,223 | 1,958 | 2,202 | 1,713 |
How we calculate your dog’s calories (RER × factor)
Vets start with the resting energy requirement, the calories a dog burns at rest: RER = 70 × (body weight in kg)0.75. Daily needs, the maintenance energy requirement (MER), are RER multiplied by a factor for life stage and lifestyle.
You may also see a simpler formula, 30 × kg + 70. The Merck Veterinary Manual notes it only works between 2 and 45 kg; at the edges it runs about 10–17% high, so we use the exponential formula for every weight.
Calorie factors by life stage and activity
| Dog | Factor × RER | Source |
|---|---|---|
| Adult, spayed or neutered | 1.6 | Merck |
| Adult, intact | 1.8 | Merck |
| Adult, low activity or gains weight easily | 1.4 | Merck; PNA 1.2–1.4 |
| Adult, very active or working | about 1.86 | NRC 130 × kg^0.75 |
| Senior | 1.4 | petcalc choice (no single published factor) |
| Puppy under 4 months | 3.0 | Merck |
| Puppy 4 months to adult | 2.0 | Merck |
| Pregnant | 1.6–2.0 | PNA; rises in the last third |
| Nursing | 2–6 | PNA; depends on litter size, ask your vet |
| Weight loss | 1.0 at target weight | PNA 1.0 |
Growing puppies need far more per pound than adults; see how big your puppy will get with our puppy weight calculator. For pregnancy dates, use the dog pregnancy calculator.
How many calories does my dog need to lose weight?
A common approach is to feed 1.0 times RER, calculated at your dog’s target weight rather than its current weight. For a dog that should weigh 50 lb, that is about 730 kcal a day. Ask your vet to set the target weight and check progress, because how fast a dog should lose weight depends on its health.
It is worth the effort. In US veterinary records, dogs with the highest body condition score had a life expectancy of 11.7 years, compared with 13.2 for dogs at an ideal weight. See how long dogs live for more.
Is my dog overweight? Body condition score
Vets use a 9-point body condition score (BCS). WSAVA guidelines say the goal for most pets is a BCS of 4 to 5.
| Score | Meaning | What you see and feel |
|---|---|---|
| 1–3 | Too thin | Ribs, spine and hip bones easy to see; little fat. |
| 4–5 | Ideal | Ribs easy to feel under a thin layer of fat; visible waist from above. |
| 6–7 | Overweight | Ribs hard to feel; waist barely visible. |
| 8–9 | Obese | Ribs can’t be felt under heavy fat; no waist; belly may sag. |
Overweight is common and easy to miss. In a 2022 survey by the Association for Pet Obesity Prevention, vets assessed 59% of dogs as overweight or obese, yet 36% of owners of overweight dogs thought their dog was a normal weight or thin.
How many treats can my dog have?
WSAVA nutrition guidelines flag snacks, treats and table food making up more than 10% of daily calories as a risk. So for a dog that needs 1,000 kcal a day, treats should stay under about 100 kcal, and the remaining 900 kcal come from its regular food. The calculator shows this split for your dog.
Why your dog’s needs may differ
Every calorie formula is a starting point. The Merck Veterinary Manual says individual needs can vary by about 30% either way, and the Pet Nutrition Alliance says by as much as 50%. Breed, coat, climate and metabolism all play a part.
Different guidelines also disagree. WSAVA’s calorie table for healthy adult dogs gives lower numbers than the Merck factors, for example 470–590 kcal for a 10 kg dog compared with about 630 kcal using Merck’s 1.6. We use the Merck factors because they are clear and reproducible, and we show a ±30% range alongside. Weigh your dog regularly and adjust: if they gain, feed a little less; if they lose, a little more.
Frequently asked questions
How many calories does a dog need a day?
It depends on weight, age and activity. A typical spayed or neutered adult needs about 1.6 times its resting energy requirement. That is about 630 kcal for a 22 lb (10 kg) dog and about 1,160 kcal for a 50 lb dog.
What is RER vs MER?
RER, the resting energy requirement, is what a dog burns at rest: 70 × body weight in kg to the power 0.75. MER, the maintenance energy requirement, is RER multiplied by a factor for life stage and activity.
How many calories does my dog need to lose weight?
A common approach is to feed 1.0 times the RER calculated at the target weight. Ask your vet for a target weight and a safe plan before you start.
How many calories should a neutered dog eat?
About 1.6 times RER, compared with 1.8 for intact adults, according to the Merck Veterinary Manual. Choose “Low” activity if your dog gains weight easily.
How many treats can my dog have a day?
Keep treats, snacks and table food to no more than 10% of daily calories, as WSAVA guidelines advise. The calculator shows that treat budget for your dog.
Do senior dogs need fewer calories?
Often, because many are less active. There is no single published factor for seniors, so we use 1.4 times RER as a starting point and adjust by body condition.
How many calories does a puppy need?
Much more per pound than an adult: about 3.0 times RER under 4 months and 2.0 times RER from 4 months until adult size, according to the Merck Veterinary Manual.
How do I know if my dog is overweight?
Use the 9-point body condition score: 4–5 is ideal, 6–7 overweight and 8–9 obese. You should be able to feel the ribs easily and see a waist from above. Your vet can score your dog at a checkup.
Keep going
Sources
- Merck Veterinary Manual. Nutritional Requirements of Small Animals.
- Merck Veterinary Manual. Daily Maintenance Energy Requirements for Dogs and Cats (table).
- Pet Nutrition Alliance. Calculating Calories Based on Pet Needs (RER/MER).
- WSAVA Global Nutrition Committee. Calorie Needs for Healthy Adult Dogs, 2020.
- WSAVA Nutritional Assessment Guidelines Task Force. WSAVA Nutritional Assessment Guidelines. Journal of Small Animal Practice, 2011.
- Association for Pet Obesity Prevention. 2022 Pet Obesity Prevalence Survey.
- Montoya M. et al. Life Expectancy Tables for Dogs and Cats Derived from Clinical Data. Frontiers in Veterinary Science, 2023.
Estimates only — not a substitute for veterinary advice. Read our disclaimer.