Resting energy
The estimated energy used for essential functions by a healthy dog at rest in a neutral environment.
Free evidence-led calculator
Dog calorie calculator
Estimate your dog’s resting energy, starting daily calorie allowance, calories per meal, and food portion using weight, life stage, meal frequency, and the energy density of the chosen food.
Instant resultskg and lbVeterinary formulaNo account required
Interactive tool
Updates instantlyCalculate your dog’s daily calories
Enter an appropriate current or ideal weight. Add kcal per cup from the food label if you also want an estimated daily portion.
Resting energy662kcal/day RERStarting daily estimate1059kcal/day MERPer meal530kcal
This estimate uses RER = 70 × body weight0.75, then applies the selected maintenance factor. It is a starting point for healthy dogs, not a prescription. Individual needs can vary substantially.
What each number means
Daily starting estimate
RER multiplied by the selected healthy-dog factor. This is the number to monitor and adjust—not a guaranteed requirement.
Label-based portion
Daily calories divided by the food’s kcal per cup. It appears only after you provide the food’s actual energy density.
How the calculation works
1. Resting energy requirement
RER = 70 × weight kg^0.75The exponential formula can be used across body weights. Weight entered in pounds is converted to kilograms before calculation.
2. Maintenance factor
- Healthy neutered adult: 1.6 × RER
- Healthy intact adult: 1.8 × RER
- Obesity-prone adult: 1.4 × RER
- Healthy puppy under 4 months: 3.0 × RER
- Healthy puppy over 4 months: 2.0 × RER
Example daily calorie estimates
These rounded examples show the formula for a healthy neutered adult. They are not breed-specific feeding prescriptions.
| Dog weight | RER | Neutered adult estimate |
|---|---|---|
| 5 kg | 234 kcal/day | 374 kcal/day |
| 10 kg | 394 kcal/day | 630 kcal/day |
| 20 kg | 662 kcal/day | 1059 kcal/day |
| 30 kg | 897 kcal/day | 1435 kcal/day |
| 40 kg | 1113 kcal/day | 1781 kcal/day |
Why actual calorie needs can differ
Dogs of the same weight can have different energy requirements because of body composition, breed, activity, age, environment, health, and individual metabolism. Review weight and body condition regularly instead of treating one calculation as permanent.
When not to rely on this calculator
Seek individualized veterinary nutrition advice for disease, pregnancy, lactation, recovery, therapeutic diets, unexplained weight change, or intentional weight loss. Puppies—especially large-breed puppies—also need a complete growth diet with appropriate nutrient balance.
Dog calorie calculator FAQs
How many calories does my dog need per day?
Start by calculating resting energy requirement from body weight, then apply an appropriate maintenance factor. The result is an estimate for a healthy dog and should be adjusted according to body condition and veterinary guidance.
Should I use current weight or ideal weight?
Use current weight when your dog is at an appropriate body condition. If your dog is underweight or overweight, ask a veterinarian which target weight and nutrition plan should be used.
How do I convert calories into cups of dog food?
Find kcal per cup on the food label or manufacturer information. Divide estimated daily calories by kcal per cup. Different foods have different energy densities, so there is no universal cup amount.
Why does a puppy need more calories than an adult dog?
Healthy growing puppies have higher energy needs relative to their body weight. The calculator uses separate documented factors for puppies under and over four months.
Does neutering change calorie needs?
Maintenance-energy references commonly use different starting factors for healthy intact and neutered adults. Individual activity, body condition, breed and environment can still change actual needs.
Can I use this calculator for weight loss?
Not as a treatment plan. Intentional weight loss should use an appropriate target weight, complete diet and monitoring plan established with a veterinarian.
Does the calculator include treats?
The daily estimate represents the total calorie budget. Treats and extras must be counted within that total so they do not unintentionally increase daily intake.
How accurate is a dog calorie calculator?
It provides a starting estimate, not an exact requirement. Veterinary references note substantial individual variation, so weight and body condition must be monitored over time.
Sources and calculation policy
Merck Veterinary Manual
RER formula, maintenance factors, limitations, and individual variability.
Open veterinary reference ↗WSAVA Global Nutrition Guidelines
Nutritional assessment, body-condition monitoring, and veterinary nutrition tools.
Open WSAVA guidance ↗Calculation method: dog-energy-rer-mer-v1 · Last reviewed: 19 July 2026 · Educational use only