Cat calorie calculator
Estimate how many calories a healthy adult cat needs per day, based on the veterinary resting-energy formula.
RER (resting energy) = 70 × (ideal weight in kg)^0.75. Daily calories = RER × a factor for your cat’s life stage and activity.
A starting-point estimate, not a prescription. A real cat’s needs can vary by as much as ±50% with activity, metabolism, and health. Feed this as a first guess, then adjust over the following weeks based on body condition and weight trend. For kittens, pregnant or nursing cats, weight-loss plans, seniors, or any cat with a medical condition, confirm the target with your veterinarian.
The formula
Resting energy requirement (RER) = 70 × (ideal body weight in kg)0.75. Daily calories = RER × a factor for your cat’s life stage and activity level.
AAHA 2021 factor table
| Profile | Factor |
|---|---|
| Neutered adult | 1.2–1.4 |
| Intact adult | 1.4–1.6 |
| Inactive / indoor (hold weight) | 1 |
| Weight loss | 0.8 |
| Kitten / growth | 2.5 |
| Pregnant | 1.6–2 |
| Nursing | 2–6 |
Always feed to your cat’s ideal weight, not necessarily their current weight — if you’re not sure which that is, the body-condition-score guide can help.