Dog Calorie Calculator — Free Daily Calorie & Nutrition Tool by Breed
Free dog calorie calculator. How many calories does my dog need? Calculate your dog
RER and MER Calculator
Calculate your pet's Resting Energy Requirement (RER) and Maintenance Energy Requirement (MER) using standard veterinary formulas. Essential for nutrition planning and calorie calculations.
How It Works
RER Formula
RER = 70 × (weight in kg)0.75
This is the standard veterinary formula for dogs and cats. RER represents the calories needed at complete rest (base metabolism).
MER Formula
MER = RER × Activity Factor
MER includes calories for normal activity. Typical multipliers:
- Low activity: 1.2×
- Moderate activity: 1.4–1.6×
- High activity: 1.8–2.0×
RER vs MER
RER is the minimum calories at rest. MER is the total daily calories including activity, digestion, and metabolism. Use RER for weight loss calculations; use MER for maintenance feeding.
RER Calculator
Results:
Estimated MER (Maintenance Energy Requirement):
RER Quick Reference Table
Common RER values by body weight. Find your pet's weight and see their resting calorie needs instantly. MER columns show daily calories at different activity levels.
| Weight | RER (kcal/day) | MER Low (1.2×) | MER Moderate (1.4×) | MER Active (1.8×) |
|---|---|---|---|---|
| 5 lbs (2.3 kg) | 131 | 157 | 183 | 236 |
| 10 lbs (4.5 kg) | 218 | 262 | 305 | 392 |
| 20 lbs (9.1 kg) | 366 | 439 | 512 | 659 |
| 30 lbs (13.6 kg) | 497 | 596 | 696 | 894 |
| 50 lbs (22.7 kg) | 727 | 872 | 1,018 | 1,309 |
| 70 lbs (31.8 kg) | 935 | 1,122 | 1,309 | 1,683 |
| 100 lbs (45.4 kg) | 1,218 | 1,462 | 1,705 | 2,192 |
Values calculated using RER = 70 × (kg)^0.75. Use the calculator above for exact results with your pet's specific weight.
Dog MER Activity & Life Stage Factors
For dogs, MER multipliers vary by activity level, life stage, and reproductive status. These are standard veterinary guidelines used by the AAHA and WSAVA:
| Dog Status | MER Factor | Notes |
|---|---|---|
| Neutered adult, low activity | 1.2 × RER | Indoor dogs, minimal exercise |
| Intact adult, moderate activity | 1.6 × RER | Regular walks and play |
| Active/working dog | 2.0–5.0 × RER | Herding, hunting, sled dogs |
| Puppy (0–4 months) | 3.0 × RER | Rapid growth phase |
| Puppy (4–12 months) | 2.0 × RER | Continued growth, moderate pace |
| Pregnant (last trimester) | 1.8–3.0 × RER | Increases with litter size |
| Lactating | 3.0–6.0 × RER | Depends on litter size and stage |
| Weight loss | 1.0 × RER | At target weight, vet supervised |
| Senior dog | 1.0–1.4 × RER | Reduced metabolism, adjust individually |
Cat MER Activity & Life Stage Factors
Cats generally have lower activity multipliers than dogs. Indoor cats are particularly prone to obesity because their energy expenditure is much lower than outdoor cats.
| Cat Status | MER Factor | Notes |
|---|---|---|
| Neutered indoor cat | 1.0–1.2 × RER | Sedentary indoor lifestyle |
| Intact adult cat | 1.2–1.4 × RER | Slightly higher metabolism than neutered |
| Active outdoor cat | 1.4–1.6 × RER | Hunting, exploring, temperature regulation |
| Kitten (0–4 months) | 2.5 × RER | Rapid growth phase |
| Kitten (4–12 months) | 2.0 × RER | Continued growth, slightly less than young kitten |
| Pregnant cat | 1.6–2.0 × RER | Increases through pregnancy |
| Lactating cat | 2.0–6.0 × RER | Depends on litter size, free-feed recommended |
| Weight loss | 0.8 × RER | At target weight, vet supervised — never fast a cat |
| Senior cat (11+ years) | 1.0–1.1 × RER | Reduced activity, monitor weight closely |
Important: RER/MER Are Starting Points
RER and MER calculations provide a starting point for calorie planning. Every pet is different — monitor your pet's weight and body condition every 2–4 weeks and adjust portions accordingly. Consult your veterinarian for personalized feeding plans, especially for weight loss, pregnancy, or medical conditions.
For a complete daily calorie plan based on your pet's specific factors, use our Dog Calorie Calculator or Cat Calorie Calculator. For weight loss planning, see the Dog Weight Loss Calculator or Cat Weight Loss Calculator.
