Free · Private · Shows its math
Cat Calorie Calculator: how much should your cat eat?
Enter your cat’s weight, age, activity, and body condition. Get a daily calorie target, food portions, and a clear view of how the number was made.
- No sign-up
- Runs in your browser
- Formula shown
Quick estimate
For an adult cat at a healthy weight. Use the full tool for kittens, weight plans, and food portions.
Why use it
A feeding plan you can check, not a guess
Bag guides are written for the average cat. This tool starts with your cat.
Daily calories
A kcal target built from weight, age, activity, and spay or neuter status.
Portions you can scoop
Turn calories into cups, grams, or cans using the number on your cat’s food label.
Weight loss or gain
Add an ideal weight and get a gentler target, plus a safe weekly pace.
Kitten to senior
Growth factors for young cats and notes for cats older than 10 years.
Math you can verify
Every result shows the resting energy, the factor, and the rounding rules.
Private by design
Calculations stay in your browser. We never see your cat’s details.
How it works
Three steps to a daily calorie target
Describe your cat
Add weight, age, activity, and body condition. If your cat needs to lose or gain weight, add an ideal weight.
Add the food
Optional. Enter the calories per cup, kg, or can from the label, plus how many meals you feed.
Read your plan
See daily kcal, a practical range, food per meal, and a plain-language note on how the number was made.
Who it helps
Made for real feeding questions
From a bored indoor cat to a litter of growing kittens, the same careful formulas apply.
Try the calculatorAn indoor cat that is gaining weight
Check whether meals plus treats go over the daily target.
A growing kitten
See how needs rise with growth and how they change as your cat nears a year old.
A cat that needs to lose weight
Get a target based on ideal weight and a safe weekly pace to watch for.
A cat that is too thin
Get a gentle gain target to bring to your vet, who should rule out health causes first.
Breeders and caregivers
Run cat after cat quickly, and share a result by link or print it for the feeding chart.
Accuracy and privacy
Standard veterinary energy formulas, calculated on your device
- Established method. The tool uses resting energy and life-stage factors that are widely used in veterinary nutrition.
- Nothing leaves your browser. No account, no uploads, and no tracking of your entries.
- An estimate, honestly labeled. Results are a starting point. Your vet knows your cat best.
Read how the calculator works and how we handle corrections.
Energy factors used
RER = 70 × kg0.75
- Spayed or neutered adult
- × 1.2
- Adult, not neutered
- × 1.4
- Weight loss (ideal-weight RER)
- × 0.8
- Cat under 4 months
- × 3.0
Quick answers
Frequently asked questions
Is the Cat Calorie Calculator free?
Yes. It is free to use, and you do not need an account or an email address.
Does it save or send my cat’s details?
No. The math runs in your browser, and your entries are not sent to any server. Your browser can remember your last entries on your own device so the form is ready next time. The Privacy Policy explains this in full, and the Reset button clears it.
Which formula does it use?
It starts with Resting Energy Requirement (RER): 70 × body weight in kg, raised to the power of 0.75. It then multiplies by a factor for life stage, activity, and weight goal. The formula section on the tool page lists every factor.
Can I use pounds and cups?
Yes. Switch between kg and lb for weight. For food, you can enter calories per cup, per kg, or per can, and the tool gives cups, grams, or cans.
Does it work for kittens and older cats?
Yes. Cats under 12 months use growth factors. Cats 12 months and older use adult factors, with a note for cats older than 10 years. Growing cats and senior cats should also have regular vet checks.
Does it replace advice from a vet?
No. It gives a starting estimate. Every cat is different, so watch your cat’s weight and body shape, and talk to your vet about health conditions or special diets. See the Disclaimer.
Ready to check your cat’s portions?
It takes about a minute, and you can print or share the result.