Cat Feeding Calculator
How much should you feed your cat? Use weight, life stage, and activity to estimate daily calories and wet vs. dry portions.
Use the calculator
How the estimate works
The calculator starts with resting energy requirement (RER = 70 × body weight in kg0.75) and applies a life-stage/status factor. These factors are starting points for healthy cats, not guaranteed requirements.
Convert calories using your own food label
Enter the kcal per cup, can or pouch from the food package. That is more reliable than using a generic “cups per pound” rule because calorie density varies considerably between foods.
Senior cats need extra caution
Energy needs in older cats can change in different directions. If an older cat is losing weight, eating differently or changing drinking/urination habits, use veterinary guidance rather than applying an automatic “senior” calorie multiplier.
How to read calculator results responsibly
Every online pet calculator — including the ones on this site — gives you a planning estimate, not a medical prescription. The math underneath is based on published veterinary nutrition formulas (resting energy requirement, life-stage multipliers, body condition adjustments), but those formulas assume an average pet. Individual pets can differ substantially from calculated estimates. Treat the result as a starting point and use body weight, body condition, appetite, activity and veterinary guidance to decide whether it needs adjustment.
The most useful comparison is often the calculator estimate versus your pet’s current routine. A large difference is a reason to review the inputs and discuss the plan with your veterinarian rather than making a sudden change.
What to track after using this calculator
Once you have a number, the most reliable way to confirm it is right is to track outcomes for two to four weeks. Four metrics tell you almost everything you need to know. Weight — measured every 1-2 weeks at the same time of day, on the same scale. Small fluctuations are normal; sustained trends are real. Body condition — a hands-on check of ribs, waist, and belly. Healthy pets have ribs you can feel under a thin layer, a visible waist from above, and a tucked-up belly from the side. Energy and behavior — pets at the right caloric intake have steady energy, normal sleep patterns, and consistent play interest. Stool quality — firm, formed stools 1-3 times daily indicate a tolerated diet at the right amount.
Track trends rather than reacting to one day. If weight, body condition, appetite, stool quality or energy changes in a concerning way, review the plan with your veterinarian.
When to consult a veterinarian instead
This calculator is appropriate for healthy adult pets with no diagnosed medical conditions, on standard maintenance routines, with normal body condition and appetite. It is not a substitute for veterinary input in any of the following situations: pets with diagnosed kidney disease, liver disease, diabetes, hyperthyroidism, Cushing's disease, or any other metabolic condition; pets on prescription diets or weight-management programs supervised by a vet; pregnant or nursing animals; pets recovering from surgery, illness, or trauma; pets younger than 8 weeks or in their last year of life; and any pet whose owner is genuinely worried about a recent change in weight, appetite, drinking, urination, or activity.
For these pets, the right tool is a conversation with your veterinarian and possibly a board-certified veterinary nutritionist. For complex nutrition cases, your veterinarian may recommend a board-certified veterinary nutritionist. Calculators are planning tools; clinical decisions belong with your veterinary team.
How this calculator fits with the rest of Pet Owner Toolkit
This calculator works best as one stop in a larger workflow. After you run it, the natural next steps depend on what you discovered. If the result suggests a meaningful change to your daily routine, pair it with the matching buyer guide (food, supplies, or emergency planning) so the change you make is also a change to a category that fits the new plan. If the result confirms your current routine, use it as a reset on your monthly budget — you now know what 'right' looks like for your pet.
You can print or screenshot calculator results and bring them to a veterinary visit as a record of the assumptions you used. The free downloadable planners on this site (medication log, vet visit tracker, budget planner) are designed to capture exactly this kind of follow-up data over time.
Finally, remember that pets change over years. A calculator result that was right two years ago may not be right today. Use this tool again any time your pet experiences a significant life event — life-stage transition, weight change of 5%+, new diagnosis, new medication, change in household activity level, or any sustained appetite change. The math underneath is the same, but the inputs you use to plug into it should always reflect the pet you actually have today.
Five related pages on Pet Owner Toolkit
Related tools and pages
Use the feeding guide to understand the result, then track weight, hydration, cost and the daily feeding schedule with these related tools.
Frequently asked questions
How often should I feed my cat?
2-4 small meals per day for adults; 4-6 small meals for kittens; 2 meals per day works for most seniors. Avoid free-feeding.
Should I switch to wet food?
At minimum, include one wet meal per day. Wet food adds hydration that supports urinary tract health and helps with weight management.
How do I know if my cat is overweight?
From above, you should see a visible waist between the ribs and hips. From the side, the belly should tuck up slightly. Ribs should be feelable under a thin fat layer. If you can't feel ribs at all, your cat is overweight.
My cat hides food/water bowls. Is that normal?
Hiding bowls or refusing to eat in their usual spot can indicate stress, illness, or an issue with the bowl location. Try moving the bowl or scheduling a vet visit if it persists.
Can I free-feed kibble if I work long hours?
It's a tradeoff. Free-feeding makes weight management harder but is sometimes necessary for owner schedules. A portion-controlled automatic feeder is a better compromise.
What about treats?
Treats should stay under 10% of daily calories — for a typical 10 lb adult cat, that's 20-30 kcal of treats max per day. Many commercial cat treats are 2-3 kcal each, so you can give 8-10 treats; but freeze-dried meat treats can be 5-8 kcal each, so adjust.