Interactive Tool
Cat & Dog Food Portion Calculator
Estimate your pet daily calorie needs and a rough range of food per day, based on weight and life stage. This is a general estimate, not a fixed diet plan.
Choose your pet
Current weight (kg)
Slide or type. Use decimals, for example 4.2 kg.
Life stage and activity
Type of food
Estimated daily energy
210 kcal per day
Rough amount of food per day
50 to 60 grams per day
Food density varies by brand, so always check the calories per 100 g on the label and split into 2 to 3 meals.
This calculator is an aid, not a diagnosis or a prescription diet. Real needs change with body condition, health, and whether your pet is spayed or neutered. For a weight-loss or medical diet, use your pet target weight and confirm the amount with a vet.
References
The formula (RER = 70 x BW^0.75) and factors follow publicly available veterinary nutrition guidance: