Calculate the daily food amount for your dog or cat scientifically
This calculator is for reference only. For precise feeding amounts, refer to the food packaging guide and consult your veterinarian.
Choose dog or cat.
Fill in weight (kg), life stage, activity level, body condition, and neuter status.
Press 'Calculate' to see RER, DER, and recommended food amounts.
| Weight | RER (kcal) | DER Neutered | DER Intact | Dry (g) | Wet (g) |
|---|---|---|---|---|---|
| 2 kg | 118 | 188 | 212 | 57 | 200 |
| 5 kg | 234 | 374 | 421 | 114 | 398 |
| 10 kg | 394 | 630 | 709 | 191 | 669 |
| 15 kg | 534 | 854 | 960 | 259 | 907 |
| 20 kg | 662 | 1059 | 1192 | 322 | 1125 |
| 30 kg | 897 | 1436 | 1615 | 436 | 1525 |
Cats have different protein metabolism and energy utilization compared to dogs. Cats rely more heavily on fat and protein, are less efficient at using carbohydrates, and often have lower energy requirements per kilogram of body weight. Neutered cats in particular show a significant drop in energy needs.
Yes. Neutering reduces basal metabolic rate and activity levels, increasing the risk of obesity. A 20–30% reduction in daily calories is commonly recommended after neutering. Monitor your pet's weight regularly and consult your vet.
Growth stages require intensive energy for cell division, bone and muscle development, and immune system maturation. Puppies under 4 months may need over 3× the adult DER; from 4–12 months about 2× is the guideline.
Manufacturer guidelines are based on the specific caloric density of their product and assume average activity. This calculator adjusts for individual factors like activity level, neuter status, and body condition. Use both as references and consult your veterinarian for final adjustments.
The right amount of food for your pet depends on species, weight, age, activity level, and neuter status. Using RER (Resting Energy Requirement) and DER (Daily Energy Requirement) formulas provides a science-based estimate.
RER (Resting Energy Requirement) is the energy needed at complete rest, calculated as 70 × (body weight in kg)^0.75. DER (Daily Energy Requirement) accounts for daily activities by multiplying RER by a life-factor coefficient. For a neutered adult dog the standard is DER = RER × 1.6; for a neutered adult cat, DER = RER × 1.2.
Dry food typically provides about 350 kcal per 100g while wet food provides about 100 kcal per 100g. Because calorie density varies by brand, always check the nutrition label on the packaging. Use the calculated amount as a starting point and fine-tune with your veterinarian.