Cat care calculators
Three tools for the questions every cat owner eventually asks: how old is my cat in human terms, is my cat at a healthy weight, and how much should my cat eat? Each one prints the veterinary convention or formula it uses, so you can check the working instead of trusting a number.
Cat age calculator
How old is my cat in human years, and which life stage is that?
Uses the AVMA / International Cat Care convention: the first year is about 15 human years, the second adds about 9, and each year after adds about 4 — not the old “multiply by 7” rule. It then places your cat in one of the 4 age-based life stages from the 2021 AAHA/AAFP Feline Life Stage Guidelines (kitten under 1 year, young adult 1–6 years, mature adult 7–9 years, senior 10 years and older) and lists what changes for vet visits, diet and play at that stage.
Open the cat age calculator →Body condition score
Is my cat underweight, ideal or overweight?
The WSAVA 9-point body condition score, where 4–5 is ideal and 5 is the target. A three-step home check — feel the ribs, look from above for a waist, look from the side for a belly tuck — tells you which band your cat is in without a scale.
Open the body condition score →Cat calorie calculator
How many calories does my cat need per day?
Resting energy requirement (RER = 70 × ideal weight in kg0.75) multiplied by the AAHA 2021 feline factor for your cat’s profile — neutered or intact adult, indoor, weight loss, kitten (×2.5), pregnant or nursing. The full factor table is printed on the page.
Open the cat calorie calculator →Which tool first?
If you are planning how much to feed, start with the body condition score. The calorie formula needs your cat’s ideal weight, and an overweight cat fed for its current weight stays overweight. Once you know the target, the calorie calculator gives a starting figure. The age calculator is independent, but a cat under a year old is still growing and uses a different calorie factor.
What these numbers are — and are not
Every tool gives a starting estimate from published veterinary guidance, not a diagnosis. A real cat’s energy needs can differ from the formula by as much as ±50%, so feed the estimate, watch body condition and weight over the following weeks, and adjust. Kittens, pregnant or nursing cats, weight-loss plans and cats with a medical condition should have their targets set with a veterinarian. How sources are chosen is on our methodology page.