Catculator
Meet Catculator: enter your cat’s weight, activity level, and food’s calorie density to estimate how many grams to feed each day.
What Catculator Does
Catculator estimates how many grams of food to feed your cat each day, based on its weight, activity level or life stage, and the calorie density of the food you feed.
The Formula
It first calculates Resting Energy Requirement (RER) = 70 × (weight in kg)0.75, the standard veterinary nutrition formula for the calories a cat burns at rest. This is multiplied by an activity or life-stage factor to get the Daily Energy Requirement (DER), then divided by the food’s calorie density to produce a daily food amount in grams.
- Check your cat food’s label or manufacturer information for its calorie density in kcal/kg (often listed as kcal/cup or kcal/kg on the bag).
- The activity/life-stage multipliers reflect commonly used veterinary nutrition guidelines and will vary somewhat between individual cats.
This is a general starting estimate for planning purposes only, not veterinary advice. Monitor your cat’s body condition and adjust portions over time, and talk to your veterinarian for a feeding plan tailored to your cat’s health.