Cat Calorie Calculator
With the defaults — a 10 lb (4.54 kg) spayed or neutered adult cat — the answer is 261–305 kcal a day (RER 218 × 1.2–1.4).
Enter your cat's details
Range 0.5–25 lb (0.23–11.34 kg).
These three factor ranges are the ones published by the reference calculator used for benchmarking; the full table with sources is in the factors section.
Read it off the calorie content statement on the food package. If the label prints kcal per kilogram, divide by 10 (3,800 kcal/kg = 380 kcal per 100 g). Leave empty and only the daily calorie figure is shown.
The reference calculator notes treats making up 5% or 10% of the daily calorie total; when a share is selected the food is scaled to whatever is left.
Only used to show the daily amount in cups as well as grams.
Everything is calculated in your browser. The numbers you type are not uploaded and not stored.
Today's calories
- Weight in kilograms
- 4.54 kg
- Resting energy requirement (RER)70 × kg0.75
- 218 kcal/day
- Daily calories for this conditionRER × factor range
- 261–305 kcal/day
- Calories left for foodafter the treats share
- 261–305 kcal/day
- Food per dayat the density you entered
- not entered yet
- Per meal
- not entered yet
- Per day in cupsif grams per cup entered
- not entered yet
These are starting estimates for healthy adult cats at a healthy body condition, not a prescription. Individual cats can vary by as much as 50% from calculated values — adjust against body condition over weeks, not days.
A cat's daily calories are a narrow number: a 10 lb cat sits around 260 to 305 kcal a day, and a single extra handful of kibble can be a fifth of that. Every calculator here takes the same starting point — weight in kilograms, RER = 70 × kg0.75, and one published activity factor — and answers a different question with it: how many calories the cat needs, how that splits between dry and wet food, what it looks like as grams and cans per meal, and how long a bag lasts. The factor bands are identical throughout.
Constants this page uses, and where each one comes from
| Constant | What it is | Named source |
|---|---|---|
| 70 | RER scaling constant, 70 × kg0.75 | Association for Pet Obesity Prevention — Cat Daily Feeding Calculator (read 2026-10-20) |
| 0.75 | exponent applied to body weight in kilograms | Ohio State University VMC — Basic Calorie Calculator for Dogs and Cats (read 2026-10-20) |
| 1.2 – 1.4 | factor range for a spayed or neutered adult cat | Association for Pet Obesity Prevention — Cat Daily Feeding Calculator (read 2026-10-20) |
| 1.4 – 1.6 | factor range for an intact adult cat | Association for Pet Obesity Prevention — Cat Daily Feeding Calculator (read 2026-10-20) |
| 1.0 | factor for an inactive indoor cat, and the weight-loss reference end of the scale | Association for Pet Obesity Prevention — Cat Daily Feeding Calculator (read 2026-10-20) |
| 5% / 10% | share of the daily calorie total that treats may take | Association for Pet Obesity Prevention — Cat Daily Feeding Calculator (read 2026-10-20) |
| 0.45359237 | kilograms per pound, exact | International pound definition (1 lb = 0.45359237 kg exactly) |
Where to start
Open the Cat Calorie Calculator first. It takes a weight and a condition, prints the RER line, the factor band and the daily kcal, and then turns that into grams per meal once you add the energy density from your food's label.
What every tool here assumes
One set of inputs and one set of published constants, listed once here rather than repeated on every page.
- Resting energy requirement. RER = 70 × (body weight in kg)0.75 — about 218 kcal a day for a 4.54 kg cat — and all four feline pages use this form.
- Activity factors. 1.0 × RER for an inactive, indoor or weight-loss reference cat, 1.2–1.4 for a spayed or neutered adult, 1.4–1.6 intact, published as ranges so the answer comes out as a band.
- Weight conversion. 1 lb = 0.45359237 kg, so the default 10 lb cat is 4.54 kg with a 261–305 kcal band, and the toggle rewrites the input without changing the kilogram figure.
- Food energy density. Read kcal per 100 g from the package's calorie statement, dividing kcal per kilogram by 10; without it the tools stop at daily calories and do not invent a gram weight.
- Premise. Healthy adult cats at a healthy body condition; kittens, pregnant or nursing queens and cats with a diagnosed condition need a veterinary feeding plan.
- Where the arithmetic runs. In your browser — no account, nothing to install, and nothing you type into these pages leaves the device.
The other tool families
Feline is one of six families on the site. The other five are Calories & Feeding, Age & Growth, Pregnancy & Special Conditions, Food Safety, and Breed & Body Condition.