Dog Calorie Calculator — Daily Energy Needs
Enter your dog's weight and lifestyle to get their daily calorie needs — calculated using the standard veterinary RER formula used by vet nutritionists worldwide.
kg
Weight unit
Lifestyle / life stage
Daily Energy Requirement — total calories your dog needs per day
- 1
Weight in kg
20 - 2
Metabolic weight (kg^0.75)
20^0.75 = 9.457Allometric scaling: larger animals need fewer calories per kg than smaller ones. - 3
Resting energy (RER)
70 × 9.457 = 662 - 4
Daily calories (DER)
662 × 1.6 = 1,059
How does this calculator work?
A dog's daily calorie need is RER × lifestyle factor, where RER = 70 × weight_kg^0.75 (kcal/day). A neutered adult dog at 20 kg needs about 70 × 20^0.75 × 1.6 ≈ 893 kcal/day. Adjust by 10–20% based on actual body condition and consult a vet for dietary decisions.
Formula
How this is calculated
The Resting Energy Requirement (RER) is the baseline calories a dog needs at rest in a thermoneutral environment — roughly equivalent to the basal metabolic rate. The standard veterinary formula, RER = 70 × (weight in kg)^0.75, uses allometric scaling (the 0.75 exponent) to account for the fact that larger animals burn fewer calories per kilogram than smaller ones. This formula is endorsed by the WSAVA Global Nutrition Committee and AAFCO.
The Daily Energy Requirement (DER) multiplies RER by a lifestyle factor that reflects the dog's activity level, reproductive status and life stage. A neutered adult dog (factor 1.6) needs about 60% more than its resting requirement; a working sled dog (factor 5+) may need five times the RER. Puppies under 4 months use a factor of 3.0 because growth requires substantial extra energy; this drops to 2.0 from 4 months until the dog reaches adult size.
These are starting estimates — individual metabolism, exact breed, coat insulation, body composition and food type all influence actual needs. Monitor your dog's body condition monthly and adjust feeding by 10–20% if weight is drifting, ideally in consultation with a vet or veterinary nutritionist.
Frequently asked questions
RER stands for Resting Energy Requirement — the calories burned at complete rest. The 0.75 exponent (metabolic body weight) is an empirically derived allometric scaling factor reflecting that metabolic rate scales with surface area (roughly weight^0.67) adjusted upward for internal organs. It gives more accurate predictions than simple linear scaling across the huge size range of dog breeds.
Neutered dogs typically need about 20–30% fewer calories than intact dogs of the same size and activity level. Neutering reduces sex hormones that influence metabolism and can alter satiety signalling, making neutered dogs more prone to weight gain. The factor used here (1.6 neutered vs 1.8 intact) reflects this.
Divide the daily calorie requirement by the kilocalories per gram (or per cup) listed on your dog food bag — this is usually shown as 'kcal ME/kg'. For example, if your dog needs 700 kcal/day and the food provides 3,500 kcal/kg, feed 700/3,500 = 0.2 kg = 200 g per day.
Also known as
TG we-Calculate Editorial Team. (2026). Dog Calorie Calculator — Daily Energy Needs [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/dog-calorie-calculator
TG we-Calculate Editorial Team. "Dog Calorie Calculator — Daily Energy Needs." TG we-Calculate. 2026. https://we-calculate.com/calculator/dog-calorie-calculator.
TG we-Calculate Editorial Team, "Dog Calorie Calculator — Daily Energy Needs," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/dog-calorie-calculator
@misc{wecalculate_dog_calorie_calculator, title = {Dog Calorie Calculator — Daily Energy Needs}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/dog-calorie-calculator}}, year = {2026}, note = {TG we-Calculate} }
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