Why does my vet recommend fewer calories?
Vets account for specific health status and weight goals. Formula estimates vary ±50% between cats.
Health Fitness
Cat Calorie Calculator
Calculate cat calorie with your details.
Personalized estimate
Use realistic inputs for the most useful results.
What this calculator does
Cats require daily calories based on body weight, life stage, and activity. Average 4kg indoor cat needs 150-200 calories. Overfeeding causes obesity, diabetes, and joint problems.
How it works
Resting Energy Requirement: RER = 70 × (Weight kg)^0.75. Multiply by activity factor (1.0-1.6).
Formula
RER = 70 × (Weight kg)^0.75. Daily needs = RER × factor (1.2-1.4 indoor, 1.6 active).
Tips for using this calculator
- Measure weight monthly, adjust if >5-10% change
- Use body condition scoring, not just weight
- Divide daily calories into 2-3 meals
- Most cat food is 70-100 cal per 100g
- Weight loss diets use 0.8 × RER with vet monitoring
Frequently asked questions
How do I know if my cat is right weight?
Body condition: feel ribs easily but not see them, visible waist from above, tucked abdomen.
Should I avoid free-feeding?
Usually yes. Scheduled feeding with measured portions provides better calorie control.