Cat Food Amount Calculator
How many calories and grams of food your cat needs per day.
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How this is calculated
Uses the WSAVA / AAHA resting-energy formula with life-stage factors. Treats should be no more than 10% of daily calories. Reweigh every 2–4 weeks and adjust by 10% to keep a body condition score of 5/9.
Source-based educational tool; not independently reviewed by a veterinarian. Cited guidance does not imply endorsement by its authors.
Formula
RER = 70 × kg^0.75 MER = RER × factor (neutered 1.2 · intact 1.4 · inactive 1.0 · weight loss 0.8 · kitten 2.5) Grams/day = MER ÷ kcal per kg × 1000
Assumptions
- •Healthy cat; use ideal weight for weight loss
- •kcal/kg taken from the food label (dry ≈ 3,500–4,200, wet ≈ 800–1,200)
- •Individual needs vary by up to ±50%