Cat Calorie Calculator
Daily Calorie Needs
Formula
RER = 70 x (weight_kg)^0.75. Daily Calories = RER x life stage factor (kitten 2.5, adult 1.2, senior 1.0) x activity factor (low 0.85, moderate 1.0, high 1.2) x condition factor (underweight 1.2, ideal 1.0, overweight 0.8).
Frequently Asked Questions
How many calories does a cat need per day?
An average 10-lb adult indoor cat needs about 200-250 calories per day. Kittens need roughly 2.5 times their resting energy requirement, while senior cats may need less. The exact amount depends on weight, age, activity level, and body condition.
What is RER for cats?
RER (Resting Energy Requirement) is the number of calories a cat needs at rest. It's calculated as 70 x (body weight in kg)^0.75. This baseline is then multiplied by factors for life stage, activity level, and health conditions to determine total daily calorie needs.
How do I know if my cat is overweight?
A cat at ideal weight should have ribs you can feel but not see, a visible waist when viewed from above, and a slight abdominal tuck. If you can't feel the ribs or there's no waist visible, your cat may be overweight. Consult your veterinarian for a body condition score assessment.
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