Cat Food Portion Calculator
Computes cat RER and MER, then divides by kcal per cup/can to estimate daily portions and optional grams.
Limitation: Educational estimate only.
How to Use the Cat Food Portion Calculator
Enter the fields below, then review the educational estimate.
Enter weight and unit.
Multi-cat households
Calculate per cat when possible. Free-feeding shared bowls hides individual intake.
What This Calculator Estimates
Applies educational cat MER multipliers to RER, then converts maintenance calories into daily portions.
Worked Examples
4 kg neutered adult, 300 kcal/cup
Inputs
Result
RER for 4 kg ≈ 198.0 kcal; MER ×1.2 ≈ 237.6; 237.6÷300 ≈ 0.79 cups.
When to call a veterinarian
Appetite changes, rapid weight shifts, lethargy, vomiting, or suspected toxin exposure need professional care—not another calculator.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorFormulas & Assumptions
Transparent educational arithmetic. Not a veterinary exam, diet prescription, or toxicity tool.
Formula
Scientific Background
Companion-animal nutrition teaching often uses the same RER allometric equation for cats with lower MER multipliers than dogs. Illness, urinary diets, and weight programs need veterinary oversight.
Sources & review
Cat Food Portion Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 23, 2026
Reference
aaha.org
https://www.aaha.org/resources/canine-life-stage-guidelines/Reference
nap.nationalacademies.org
https://nap.nationalacademies.org/catalog/10668/nutrient-requirements-of-dogs-and-catsReference
wsava.org
https://wsava.org/global-guidelines/global-nutrition-guidelines/Free Calculator Hub methodology
Free Calculator Hub
/methodology
See our methodology and corrections policy.