How much should your cat eat today?

Three questions, vet-standard math (the RER formula clinics use), zero sign-up. Get daily calories and a real-food portion guide.

kg

Enter a weight between 0.3 and 15 kg. (25 kg is probably 2.5 — a common slip!)

2 · Life stage
3 · Which sounds most like your cat?
— kcal / day

—if feeding wet food
(~80 kcal / 100 g)
—if feeding dry food
(~375 kcal / 100 g)
—if home-cooked chicken base
(~120 kcal / 100 g)

Guidance for a healthy cat, not veterinary advice — cats with a diagnosed condition, and kittens under 8 weeks, need portions from their vet. Split the day across 2–3 meals and adjust ±10% based on body condition over a few weeks.

This is one day, averaged. CatCulate does this every morning for your exact cat — then checks the taurine, moisture, and protein inside those calories, and fixes tomorrow's bowl.

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The math, shown honestly

Resting Energy Requirement: RER = 70 × (weight in kg)0.75 — the standard clinical formula. Daily calories multiply RER by a life factor: neutered adult ×1.2, intact/active ×1.4, weight-loss ×0.8 (of ideal weight), senior ×1.1, kitten ×2.5 (down to ×2 near a year old). Portion grams divide calories by typical energy density per food type.

Real feeding varies by the actual foods in the bowl — which is exactly the part the app manages daily.