Cat Food Calculator | Daily Calories & Portions
Estimate cat calories from weight, life stage, neuter status, activity, and body condition. Convert calories into wet and dry portions, hydration, cost, and food transition plans.
Neutered Adult
Daily calories
261 kcal
Wet food
1.02 cans
Dry food
0.20 cups
Per meal
87 kcal
Life Stage
Cat Profile
Food Label Info
Food Transition Schedule
Days 1-2
Old 75%
New 25%
Days 3-4
Old 50%
New 50%
Days 5-6
Old 25%
New 75%
Day 7+
Old 0%
New 100%
Cats can be sensitive to food changes. Extend the transition if appetite or digestion changes.
Consult your veterinarian
These estimates use the Resting Energy Requirement formula (70 × kg^0.75) with standard activity multipliers. Individual cats vary. Monitor body condition and adjust portions over 2-4 week periods with your vet's guidance.
What Is the Cat Food Calculator?
Cats evolved as desert hunters — they get most of their water from prey, not from drinking. Their thirst drive is physiologically weak. A cat on exclusively dry food is often chronically mildly dehydrated. A 180g can of wet food delivers about 140ml of water, covering most of a 4kg cat's daily fluid needs.
This calculator uses 70 × kg^0.75 for Resting Energy Requirement, applies a life stage multiplier, and converts the daily calorie target into wet cans and dry cups. Neutered indoor cats use a 1.2× multiplier — low deliberately, because neutering reduces metabolic rate and indoor life removes the calorie burn of hunting.
Cat Food Calculator Formula and Method
RER (kcal/day) = 70 × bodyweight_kg^0.75.
Daily Energy Requirement = RER × life stage multiplier × BCS adjustment.
Wet kcal = DER × (wet share ÷ 100).
Wet cans = wet kcal ÷ kcal per can.
Dry cups = dry kcal ÷ kcal per cup.
How to Use
- 1
Enter your cat's weight in kilograms or pounds. For a weight loss plan, enter the target ideal weight rather than current weight — this sets calories to maintenance for the goal, creating a gradual deficit.
- 2
Select the life stage that matches your cat. Kitten applies until about 12 months (18 months for large breeds). Choose Neutered Adult for desexed cats over 1 year. Senior for cats over 10. Nursing/Pregnant for queens supporting a litter.
- 3
Set the Body Condition Score on the 1–9 slider. At BCS 5, ribs are felt easily with light fingertip pressure and the waist is visible from above. BCS 7 or above triggers a 10% calorie reduction. Dense fur hides weight — palpate directly.
- 4
Enter the calories per can from your wet food packaging and the calories per cup from your dry food. Look for "Metabolizable Energy" on the guaranteed analysis panel. If only kcal/kg is listed for dry food, divide by 100g to convert.
- 5
Set the wet food percentage slider to reflect how much of daily calories should come from wet food. 70% wet and 30% dry is a common recommendation. Cats with urinary or kidney issues benefit from 80–100% wet.
- 6
Set the number of meals per day. Two to three measured meals is better than free-feeding — it lets you monitor intake, which is often the earliest indicator of illness. Meal feeding also prevents one cat eating another's portion.
- 7
Check the wet food portion against standard can sizes. If the calculated portion rounds to an awkward fraction, adjust the wet/dry ratio slightly or switch to smaller pouches that better match your cat's daily needs.
- 8
Note the hydration contribution from wet food in the results. A cat eating primarily wet food typically drinks very little from a water bowl — and that's normal. A cat eating mainly dry food that rarely drinks is the one to watch.
Cat Food Calculator Example
A 10lb (4.5kg) neutered adult indoor cat at BCS 5. RER = 70 × 4.5^0.75 = 70 × 2.96 ≈ 207 kcal/day. Neutered indoor multiplier = 1.2×. DER = 207 × 1.2 = 248 kcal/day. At 70% wet: 174 kcal from wet food, 74 kcal from dry. If wet food is 180 kcal per 156g can, that's 0.97 cans — effectively one can per day. Dry food at 380 kcal/cup: 74 ÷ 380 ≈ 0.19 cups (about 20g), which works as a small topper or afternoon snack.
A 3-month-old kitten weighing 1.2kg. RER = 70 × 1.2^0.75 ≈ 80 kcal/day. Kitten multiplier = 2.5×. DER = 200 kcal/day — nearly as much as the 4.5kg adult cat, despite weighing a quarter as much. At 100% wet kitten food (100 kcal per 85g pouch): 2 pouches per day across 4 small meals. Recalculate monthly — by 6 months at 2.5kg, DER rises to about 330 kcal/day even with the same multiplier, because the heavier weight raises the RER.
Understanding Cat Food
Why Cats Are Not Small Dogs
Cats are obligate carnivores — they derive energy from protein and fat, not carbohydrates. Unlike dogs, cats can't synthesise taurine from other precursors and need it pre-formed in animal protein. They also have limited ability to down-regulate protein catabolism during calorie restriction.
This matters for weight management. A diet with fewer calories but adequate protein (at least 30–35% from protein on a dry matter basis) protects muscle in a way that a high-carbohydrate reduced-calorie diet doesn't.
The Hydration Argument for Wet Food
Wild cats get roughly 70% of their water from prey. Domestic cats retain this low thirst drive — on exclusively dry food, most don't compensate by drinking more. The result is chronic mild dehydration, linked to higher rates of urinary tract disease and kidney disease.
Wet food averages 78–82% moisture, compared to 8–12% for dry kibble. A 4kg cat eating one 180g can gets about 140ml of water directly from the meal, covering most of the roughly 240ml daily requirement.
Life Stage Multipliers for Cats
Cats have lower multipliers than dogs at equivalent life stages. Neutered indoor adults use just 1.2× their RER — reduced by both neutering (which cuts metabolic rate by 20–30%) and indoor lifestyle. This is why the neutered indoor cat is prone to weight gain even on modest portions.
Kittens use 2.5× — a 1kg kitten needs about 200 kcal/day, nearly as much as a 4.5kg adult. Nursing queens need 3.0×, making lactation the most calorie-intensive state in a cat's life.
Body Condition Score in Cats
The feline BCS scale runs 1–9, with 5 as the target. Run your fingertips along the ribcage with very light pressure. At BCS 5, you feel individual ribs easily. The waist forms a clear hourglass from above. There's a slight abdominal tuck from the side.
At BCS 9, ribs can't be felt at all, the waist has disappeared, and fat deposits appear over the lower back. Cats with dense coats are frequently more overweight than they appear — always palpate under the fur. Target no more than 0.5–1% body weight loss per week.
Free-Feeding vs Meal Feeding
Leaving dry food out all day makes it impossible to monitor how much your cat eats — and intake change is often the earliest sign of illness. In multi-cat homes, free-feeding usually means one cat overeats and another doesn't get enough.
Meal feeding — two or three measured portions per day, removed after 30 minutes — solves all of these. Most cats adapt within 1–2 weeks. Per-meal amounts in this calculator are calculated from your specified number of daily meals.
Frequently Asked Questions
How much should I feed my cat?
A typical 4–5kg neutered adult indoor cat needs around 200–250 kcal per day — roughly one 156g can of wet food or 50–65g of dry kibble. Individual cats vary by 20–30% from these averages. Use the calculator with your food's actual calorie density and check BCS every 4 weeks.
How many cans of wet food per day?
For a typical 4–5kg neutered adult at roughly 230 kcal/day, most standard 156g cans (around 180 kcal) cover almost the full daily requirement — about one can plus a small dry portion, or 1.3 cans wet only. Small 85g pouches work out to 2–3 per day. Always check kcal/can on your specific label.
Should cats eat wet or dry food?
Both can be nutritionally complete. The strongest argument for wet food is hydration — cats have a low thirst drive and frequently become mildly dehydrated on exclusive dry diets, increasing urinary tract disease risk. If exclusive wet feeding is impractical, at least 50% of calories from wet food provides meaningful hydration benefit.
How do I know if my cat is overweight?
Run your fingertips along your cat's ribcage with light pressure. At a healthy weight, you feel individual ribs easily. The waist narrows clearly behind the ribs from above. There's a slight abdominal tuck from the side. Dense fur is deceptive — part the coat and palpate directly.
How often should I feed my cat?
Two to three measured meals per day is better than free-feeding. It lets you monitor intake — a skipped meal is often the first sign your cat is unwell. Kittens under 6 months should eat four small meals daily. Adult cats adapt well to two meals.
My cat keeps begging for food — is it actually hungry?
Probably not, if the calculated portion is correct and BCS is stable. Cats beg for boredom, attention, or mealtim ritual — not always hunger. Try splitting the same daily total into three meals instead of two, or use a puzzle feeder. Don't reward begging with extra food — it trains the behaviour.
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