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.
Enter your cat's weight and condition to get daily calories — and, once you add the energy density from your food's label, the grams per meal behind that number. The equation (RER = 70 × kg0.75) and every factor range are printed in full below.
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
Start with the Cat Calorie Calculator: it needs only a weight and a condition, so it returns a daily calorie range before you have read a single food label. Get that range first, then use the Feline page that turns calories into grams — the number you actually scoop.
The equation, every symbol defined
daily calories = RER × factor
| Symbol | What it means | Unit |
|---|---|---|
| RER | Resting energy requirement — the energy an unfed, resting cat burns keeping its body running | kcal per day |
| 70 | The scaling constant of the equation as published by both sources below | — |
| kg | Your cat's current body weight in kilograms (1 lb = 0.45359237 kg exactly) | kg |
| 0.75 | The exponent: energy needs grow more slowly than weight, so the tool is not a straight per-kilogram multiplier | — |
| factor | The activity-and-life-stage multiplier for your cat's condition (table below) | — |
The same equation applies to dogs and cats: one university teaching source states the resting energy requirement “can be calculated by multiplying the animal's body weight in kilograms raised to the ¾ power by 70”, and the reference calculator used for this page's benchmark prints the same line for cats. Both were read on 2026-10-20 and are listed in the sources section.
The factor ranges, and what they are not
The equation gives resting calories. Daily needs are the resting figure times a factor. The three factor ranges below are the ones published by the reference calculator this page was benchmarked against, read on 2026-10-20:
| Condition | Factor | What it covers, as published |
|---|---|---|
| Spayed or neutered adult | 1.2 – 1.4 | Desexed adult cats kept indoors |
| Intact adult | 1.4 – 1.6 | Adult cats that are not desexed |
| Inactive | 1.0 | Indoor, low-activity cats; the weight-loss reference end of the scale |
Honest limits of this table. These ranges come from a single published source — the reference calculator's own factor settings — and are shown as ranges, not points, because that is how they are published. No second independent source for the exact numeric values was obtained for this page. What the ranges deliberately exclude: growing kittens, pregnant or nursing queens, and cats with medical conditions. No factor for those life stages was found with a traceable source, so none is published here — this tool does not estimate them.
From calories to grams: the label route
The calorie figure is only half the job — the scoop is measured in grams or cups. The tool above finishes the conversion once you enter the energy density printed on your food:
grams per meal = grams per day ÷ meals per day
cups per day = grams per day ÷ grams per cup
- kcal per 100 g — read the calorie content statement on the package. If the label prints kcal per kilogram, divide by 10 (3,800 kcal/kg = 380 kcal per 100 g). No default value is pre-filled here on purpose: no published reference table of cat-food energy densities was used for this page, and inventing one would be worse than leaving the box empty.
- kcal per cup labels — most US dry-food labels print calories per cup rather than per 100 g. A cup is a volume, not a weight, so it cannot be converted without the grams-per-cup figure from the manufacturer. Enter both values if your label works that way.
- Treats — when you pick a 5% or 10% share, the food is scaled to the remaining calories, so the treats come out of the daily total instead of on top of it.
Daily calories by weight — the chart the top three results do not print
Every calculator that outranks this page for “cat calorie calculator” makes you type a weight and returns one number for that weight. None of them prints a table. This one does — the same equation, run across the supported weight range, for all three conditions:
| Weight | In kilograms | Spayed / neutered 1.2 – 1.4 × RER | Intact 1.4 – 1.6 × RER | Inactive 1.0 × RER |
|---|---|---|---|---|
| 4 lb | 1.81 | 131–153 | 153–175 | 109 |
| 6 lb | 2.72 | 178–208 | 208–237 | 148 |
| 8 lb | 3.63 | 221–258 | 258–294 | 184 |
| 10 lb | 4.54 | 261–305 | 305–348 | 218 |
| 12 lb | 5.44 | 299–349 | 349–399 | 249 |
| 15 lb | 6.80 | 354–413 | 413–472 | 295 |
| 18 lb | 8.16 | 406–473 | 473–541 | 338 |
| 20 lb | 9.07 | 439–512 | 512–585 | 366 |
All figures in kcal per day, each row is
70 × (lb × 0.45359237)0.75 × factor, rounded to whole kcal.
The boundaries of the table follow the supported range: 0.5 lb gives an RER of 23 kcal, and 25 lb gives
an RER of 433 kcal. The tool above reproduces any row on demand.
Worked example — every step, recomputable
A 10 lb spayed adult cat, food that supplies 380 kcal per 100 g, two meals, no treats counted. (The 380 figure is an example density for the arithmetic — the box in the tool is deliberately empty so your own label's number goes in.)
Step 1 — weight in kilograms
10 lb × 0.45359237 = 4.5359 kg
Step 2 — resting energy requirement
RER = 70 × 4.53590.75 = 70 × 3.108 = 218 kcal/day
Step 3 — daily calories, factor range applied
neutered range 1.2 – 1.4, applied to the unrounded RER of 217.6: 217.6 × 1.2 = 261.1 → 261; 217.6 × 1.4 = 304.6 → 305 → 261–305 kcal/day
intact range 1.4 – 1.6 would give 304.6–348.1 → 305–348; inactive 1.0 gives 217.6 → 218
Step 4 — calories into grams
grams = kcal × 100 ÷ 380 → 261 × 100 ÷ 380 = 69; 305 × 100 ÷ 380 = 80 → 69–80 g/day
Step 5 — per meal
69 ÷ 2 = 34; 80 ÷ 2 = 40 → 34–40 g per meal at two meals
Step 6 — the same cat, treats at 5%
261 × 0.95 = 248; 305 × 0.95 = 289 kcal for food → 248 × 100 ÷ 380 = 65; 289 × 100 ÷ 380 = 76 → 65–76 g/day, 33–38 g per meal
What this page deliberately does not do
- No kittens. No growth-stage factor was found with a traceable source, so none is published here. Growing kittens need a veterinary plan, not this equation.
- No pregnant or nursing queens. Same reason — reproduction needs are not estimated on this page.
- No body-condition-score ideal-weight estimation. Two of the three top results estimate an ideal weight from a body condition score and feed to that instead. This page calculates from the weight you enter, and says so, rather than quietly mixing the two methods.
- No medical or therapeutic diets. Chronic kidney disease, diabetes and the rest need a veterinary nutritionist.
- No search volume, difficulty or pricing data. This page is about cats, not keywords.
Questions this page gets asked
How many calories should a cat eat per day?
For the defaults on this page — a 10 lb (4.54 kg) spayed adult cat — the equation gives a resting energy requirement of 218 kcal/day and a daily figure of 261–305 kcal after the 1.2–1.4 factor range. The weight chart above covers 4–20 lb for all three conditions; the tool takes any weight in the supported 0.5–25 lb range.
Is this the same as a calorie calculator for cat food labels?
Half of it is. The calorie figure comes from weight and condition; the grams figure needs one number from the package — the energy density in kcal per 100 g (or kcal per kg divided by 10). The label route is written out step by step above, including the cups conversion and the treats share.
What about a calorie cat calculator for kittens?
This page is adult cats only. A growth-stage factor could not be sourced from a published reference while building this page, so it is not estimated here — a blank would be worse than an honest boundary. Growing kittens should be fed to a veterinary plan.
Does a cat kcal calculator differ from a cat nutrition calculator?
On this page, yes. “kcal” is simply the unit the calorie figures are expressed in, so a cat kcal calculator and a cat calorie calculator are the same tool. Cat nutrition in the wider sense — protein, taurine, fatty acids, moisture — is out of scope; this page estimates energy only.
Is a feline calorie calculator enough for weight loss?
It is a starting reference, not a plan. The inactive row (1.0 × RER) is the lower end of the published scale; one reference source gives a healthy weight-loss rate for cats of 0.5–1% of body weight per week, and weight loss in cats should be overseen by a veterinary team.
Where do the factor ranges come from?
From the published settings of the reference calculator this page was benchmarked against, read on 2026-10-20 and listed below. That is a single source for the exact numbers — it is stated as such, along with the caveat that individual cats can differ from calculated values by as much as 50%.
Sources for every number on this page
- Association for Pet Obesity Prevention — Cat Daily Feeding Calculator
(
petobesityprevention.org/cat-daily-feeding-calculator, read 2026-10-20): the printed equation “RER = 70 × current body weight in kg0.75”, the three factor ranges used in the tool (spayed/neutered 1.2–1.4, intact 1.4–1.6, inactive 1.0), the supported 0.5–25 lb weight range, and the note that treats can make up 5% or 10% of the daily calorie total. - Ohio State University Veterinary Medical Center — Companion Animal Nutrition Support Service,
Basic Calorie Calculator for Dogs and Cats
(
vet.osu.edu, read 2026-10-20): the resting energy requirement “calculated by multiplying the animal's body weight in kilograms raised to the ¾ power by 70”, and the warning that individual pets' needs can vary by as much as 50% from calculated values. - Pet Nutrition Alliance — Calorie Calculator (cats)
(
petnutritionalliance.org/resources/calorie-calculator?type=cats, read 2026-10-20): the healthy weight-loss rate for cats of 0.5–1% of body weight per week quoted in the weight-loss answer. - Unit definition: 1 lb = 0.45359237 kg exactly (international pound), used for every pound-to-kilogram conversion on the page.
Benchmark note, for transparency: the three pages that outranked this page for “cat calorie calculator” at the time of writing — two veterinary-nutrition nonprofits and a pet-food manufacturer's professional institute — were each read on 2026-10-20. Of the three, only one prints the equation and the factor ranges; none prints a weight-by-condition table, which is what the chart on this page adds.