How Much to Feed a Cat by Weight & Age: Portion Guide

The Quick Answer: Start With Weight, Then Adjust for Age, Body Condition, and Food Type

If you’re trying to figure out how much to feed a cat by weight, here’s the most reliable approach:

1. Find your cat’s current weight (in pounds or kilograms).
2. Decide what “ideal” looks like using a body condition score (BCS), not vibes.
3. Pick a calorie target based on life stage (kitten, adult, senior) and lifestyle (indoor couch cat vs. high-energy).
4. Convert calories to a measured portion (cups, cans, grams).
5. Re-check weight and body condition every 2–4 weeks and adjust.

Why it’s not just a chart: cats have different metabolisms, activity levels, and body types. A 10 lb sleek Siamese and a 10 lb stocky British Shorthair may need different daily calories to stay lean.

In this guide, you’ll get practical portion sizes by weight and age, plus exactly how to measure, what to do for wet vs. dry, and how to fix common feeding mistakes.

Step 1: Use Weight + Body Condition (BCS), Not Weight Alone

Two cats can weigh 12 lb and have totally different needs. That’s why vet teams rely on Body Condition Score (BCS).

A simple at-home BCS check (takes 30 seconds)

Stand over your cat and run your hands lightly along their sides.

• •Too thin (BCS 3/9 or less): ribs feel sharp, waist is extreme, little fat coverage.
• •Ideal (BCS 4–5/9): ribs are easy to feel with a thin layer of fat; visible waist behind ribs; belly tuck.
• •Overweight (BCS 6–7/9): ribs are harder to feel; waist is minimal; belly pad larger.
• •Obese (BCS 8–9/9): ribs are difficult to feel; no waist; abdomen rounded.

Why this matters: your feeding goal might be maintenance (stay the same), weight loss, or weight gain—and those require different calorie targets even at the same weight.

Pro-tip: If your cat’s belly swings side-to-side when they walk, that’s not automatically “fat.” Some cats have a normal primordial pouch. Use rib feel + waist shape to decide.

Step 2: Know Your Cat’s Daily Calorie Target (The Part Most Charts Skip)

Portion sizes come from calories, not from “cups.” A cup of one food might be 300 kcal; another might be 500 kcal. That’s a huge difference.

A practical calorie guide by weight (adult cats)

These ranges work well for most healthy adult cats at an ideal BCS:

• •5 lb (2.3 kg): ~160–200 kcal/day
• •7 lb (3.2 kg): ~190–230 kcal/day
• •8 lb (3.6 kg): ~200–250 kcal/day
• •10 lb (4.5 kg): ~230–280 kcal/day
• •12 lb (5.4 kg): ~250–320 kcal/day
• •14 lb (6.4 kg): ~270–360 kcal/day
• •16 lb (7.3 kg): ~290–400 kcal/day

How to use this:

• •Lower end for indoor, sedentary, spayed/neutered cats.
• •Higher end for active cats, intact cats, or naturally lean/high-energy breeds.

When to modify calories (common real-life categories)

• •Weight loss: start around 10–20% fewer calories than current intake (not below safe minimums—more on that later).
• •Weight gain: increase by 10–20%, recheck every 2 weeks.
• •Senior cats (7+): many need slightly fewer calories… but some seniors lose muscle and need more protein rather than more calories.

Pro-tip: A “normal” adult cat often lands around 20–30 calories per pound of ideal body weight per day, but lifestyle and body condition can push that up or down.

Step 3: Convert Calories to Portions (Wet vs. Dry vs. Mixed Feeding)

Once you know daily calories, the next question is: how many cans, how much kibble, or how much of both?

Where to find calorie info on food

Look for:

• •kcal/cup (dry food)
• •kcal/can (wet food)
• •Sometimes kcal/oz or kcal/kg

It’s usually near the “Guaranteed Analysis” or feeding guidelines.

Dry food portions: how much kibble by weight

Dry food is calorie-dense and easy to overfeed if you scoop by eye.

Example conversions (these are typical ranges; check your bag):

• •Many dry foods are 350–500 kcal per cup.
• •That means 1/2 cup could be 175–250 kcal.

If your 10 lb indoor adult needs ~240 kcal/day:

• •If the kibble is 400 kcal/cup:

240 ÷ 400 = 0.6 cup/day (a bit over 1/2 cup)

Better method: weigh kibble in grams using a kitchen scale. It’s far more consistent than cups.

Wet food portions: how many cans per day

Wet food varies too, but a common 3 oz can is often 70–110 kcal.

If your 10 lb indoor adult needs ~240 kcal/day:

• •If each 3 oz can is 90 kcal:

240 ÷ 90 = 2.7 cans/day (about 3 cans)

Wet food often supports hydration and can help weight management because it’s lower calorie per volume.

Mixed feeding portions (wet + dry)

Mixed feeding is common and works great if you measure.

Example: 10 lb indoor adult target ~240 kcal/day Goal: 60% wet + 40% dry

• •Wet calories: 240 × 0.6 = 144 kcal
• •Dry calories: 240 × 0.4 = 96 kcal

If wet is 90 kcal per 3 oz can:

• •144 ÷ 90 = 1.6 cans/day (about 1 and 2/3 cans)

If dry is 400 kcal/cup:

• •96 ÷ 400 = 0.24 cup/day (about 1/4 cup)

This is a very typical plan for cats that gain weight easily.

Portion Sizes by Weight: Practical Daily Feeding Examples (Adult Cats)

These examples assume an adult cat at ideal BCS, mostly indoor, average activity. Use them as a starting point, then adjust.

6–8 lb adult cats (smaller frames)

Target calories: 180–240 kcal/day

• •All wet (3 oz cans at 90 kcal): 2–2.5 cans/day
• •All dry (400 kcal/cup): ~0.45–0.6 cup/day
• •Mixed: 1.5 cans + 1/4 cup/day

Breed examples:

• •Singapura or petite domestic shorthair: often 6–8 lb and can do well on the lower end.
• •Siamese (lean, active): may need the higher end.

9–12 lb adult cats (most common range)

Target calories: 220–320 kcal/day

• •All wet (3 oz at 90 kcal): 2.5–3.5 cans/day
• •All dry (400 kcal/cup): ~0.55–0.8 cup/day
• •Mixed: 2 cans + 1/4–1/3 cup/day

Breed examples:

• •Domestic shorthair: very commonly 9–12 lb ideal.
• •British Shorthair: can be heavier with a stockier build; watch BCS because they gain easily.

13–16 lb adult cats (large-framed)

Target calories: 270–400 kcal/day

• •All wet (3 oz at 90 kcal): 3–4.5 cans/day
• •All dry (400 kcal/cup): ~0.7–1.0 cup/day
• •Mixed: 3 cans + 1/4–1/2 cup/day

Breed examples:

• •Maine Coon: often large-framed; ideal weights vary widely (many are healthy at 13–18+ lb).
• •Norwegian Forest Cat: similar story—big cats can be lean.

Important: a 16 lb cat is not automatically overweight. If ribs are palpable and there’s a waist, that might be their normal.

Portion Sizes by Age: Kittens, Adults, and Seniors Need Different Strategies

Kittens (0–12 months): expect big appetites and frequent meals

Kittens are growing machines. They need more calories per pound than adult cats.

General rules that work well:

• •Under 4 months: offer 3–4 meals/day (or free-choice measured amounts, if they don’t overeat).
• •4–6 months: 3 meals/day
• •6–12 months: 2–3 meals/day

Feeding targets (broad, varies by size and growth rate):

• •2–4 lb kitten: ~180–300 kcal/day
• •5–7 lb kitten: ~250–400 kcal/day
• •8–10 lb kitten (big breeds or late growth): ~300–500 kcal/day

Breed scenario:

• •Maine Coon kittens grow longer than most cats and may stay in a “kitten-like” growth phase beyond 12 months. Your vet may recommend kitten food longer.

Common kitten mistake:

• •Switching to adult food too early and then wondering why the kitten is ravenous or not gaining well.

Pro-tip: If you adopt a kitten, ask the shelter what they were eating and transition slowly over 7–10 days. Sudden food swaps cause diarrhea fast.

Adult cats (1–7 years): consistency and measurement matter most

Adult cats thrive on routine.

• •Pick a calorie target.
• •Measure portions.
• •Maintain lean body condition.

If your cat is food-obsessed, don’t assume they’re underfed. Some cats are just highly food-motivated and benefit from:

• •wet food base
• •puzzle feeders
• •more meals with smaller portions

Senior cats (7+ years): prioritize protein and monitoring

Senior metabolism is unpredictable:

• •Some seniors gain easily due to lower activity.
• •Others lose weight or muscle from dental issues, thyroid disease, kidney disease, or just aging.

Feeding priorities:

• •Maintain muscle: choose diets with solid animal protein.
• •Watch body weight monthly, not yearly.
• •Consider wet food if hydration, teeth, or appetite are issues.

If a senior cat is losing weight unintentionally, portion math is not the fix—your vet should check for medical causes.

Step-by-Step: How to Figure Out Exactly How Much to Feed Your Cat (With Real Numbers)

Use this if you want a repeatable method you can trust.

Step 1: Weigh your cat accurately

Options:

• •Use a baby scale (best).
• •Or weigh yourself holding the cat, then subtract your weight.

Record it.

Step 2: Decide the goal weight (if needed)

If your cat is overweight, use ideal weight as the reference—not current weight.

If you’re unsure, your vet can estimate ideal weight based on frame and BCS.

Step 3: Pick a starting calorie target

Use the weight-based ranges earlier, then choose:

• •lower end for sedentary indoor cats
• •mid-range for average cats
• •higher end for active cats

Step 4: Read the food label for calories

Write down:

• •dry: kcal/cup and/or kcal/kg
• •wet: kcal/can

Step 5: Do the math and measure portions

Example scenario: Your cat is 12 lb, indoor, slightly overweight (BCS 6/9). Goal is gentle weight loss. Start target: ~250 kcal/day (a bit lower than maintenance)

You feed:

• •Wet food: 3 oz can at 95 kcal
• •Dry food: 420 kcal/cup

Plan: 2 wet cans + small amount of dry for crunch Wet: 2 × 95 = 190 kcal Remaining: 250 − 190 = 60 kcal Dry amount: 60 ÷ 420 = 0.14 cup/day (about 2 tablespoons)

That’s a realistic, measurable plan.

Step 6: Re-check every 2–4 weeks and adjust

Healthy targets:

• •Weight loss: about 0.5–2% body weight per week
• •Weight gain: slow and steady (too fast can mean fat gain)

If nothing changes after 3–4 weeks:

• •decrease or increase daily calories by 5–10%, not 30%.

Common Feeding Scenarios (And Exactly What to Do)

“My cat acts hungry all the time”

This is one of the most common issues I hear.

Try this first:

• •Switch 25–50% of daily calories to wet food
• •Split into 3–5 smaller meals
• •Add puzzle feeders for dry food portions
• •Increase play: 2–3 short sessions/day (5 minutes counts)

Also consider medical causes if hunger is intense:

• •Hyperthyroidism (older cats)
• •Diabetes
• •Intestinal parasites (more common in young/outdoor cats)

“I free-feed dry food and my cat is getting chunky”

Dry food can be part of a healthy plan, but free-feeding often leads to passive overeating.

Fix:

• •Measure the full day’s kibble in the morning.
• •Put it in a container.
• •That container is the “budget.”
• •Feed it in 2–4 portions or via timed/puzzle feeders.

“My cat won’t eat wet food”

Do a gradual transition:

1. Warm wet food slightly (10 seconds in microwave; stir and test temperature).
2. Mix a teaspoon of wet into their usual food.
3. Increase slowly over 1–2 weeks.

You can also try different textures:

• •pate vs. chunks in gravy vs. shredded

Breed note:

• •Some Persians and flat-faced cats prefer certain textures because of how they pick up food.

“Multi-cat household: one cat steals food”

Portion control is harder with multiple cats.

Options that work:

• •Feed in separate rooms for 10–15 minutes, then pick up bowls.
• •Use microchip-activated feeders for the cat who needs controlled portions.
• •Put the higher-calorie cat food where only one cat can reach (baby gate with a small opening, countertop access—only if safe).

Wet vs. Dry: Which Is Better for Portion Control and Health?

Both can work; the best choice is what your cat eats well and what you can portion consistently.

Wet food pros/cons

Pros:

• •Higher moisture supports hydration
• •Often easier for weight management (more volume for fewer calories)
• •Useful for cats prone to urinary issues

Cons:

• •More expensive per calorie
• •Some cats need time to adjust

Dry food pros/cons

Pros:

• •Convenient and budget-friendly
• •Works well with puzzle feeders
• •Easy to store

Cons:

• •Calorie dense (easy to overfeed)
• •Lower moisture
• •“A little extra” adds up fast

A strong middle-ground: mostly wet + measured dry.

Pro-tip: Don’t rely on “indoor cat” labels alone. Always check kcal/cup or kcal/can—that’s what determines portion size.

Product Recommendations (Practical Tools That Make Portioning Easier)

Not sponsored—these are the types of products that consistently help cat parents succeed.

Must-have: kitchen scale (for dry food precision)

A $10–$20 digital kitchen scale makes portions repeatable.

• •Measure kibble in grams instead of cups.
• •Helps a lot if multiple people feed the cat.

Puzzle feeders (for hungry cats)

Good for cats who inhale meals or beg constantly:

• •Slow down eating
• •Add enrichment
• •Stretch calories further through time/effort

Look for:

• •adjustable difficulty
• •easy-to-clean materials

Timed or microchip feeders (multi-cat households)

Best if:

• •one cat is on a diet
• •one cat needs prescription food
• •one cat steals

Microchip feeders can be a game-changer for accurate intake.

Measuring tools

• •A dedicated measuring scoop is fine, but only if you level it the same way every time.
• •If you use cups, use the same cup and don’t “heap.”

Common Mistakes That Cause Overfeeding (Even When You’re Trying Hard)

“I follow the bag’s feeding guide exactly”

Those charts often overestimate. They also assume a certain activity level that many indoor cats don’t have.

Use the chart as a starting point, then adjust to keep your cat lean.

Treats aren’t counted

Treats should usually be under 10% of daily calories.

Practical example: If your cat eats 240 kcal/day, treats should be about 20–25 kcal/day max.

Treat calorie traps:

• •crunchy treats can be 2–5 kcal each (adds up fast)
• •lickable tube treats can be 15–20 kcal per tube

“A scoop is a scoop”

Scoop sizes differ and human scooping isn’t consistent. If weight management matters, measure by grams.

Not adjusting after spay/neuter

Many cats need fewer calories after sterilization due to reduced metabolism and activity. That’s a common time for weight gain.

Breed and Body Type Examples: How Feeding Can Differ

Maine Coon (large frame, long growth)

• •May stay “in growth mode” longer
• •Often does well with higher protein, controlled calories
• •Portioning should be based on BCS—many are healthy at higher weights

British Shorthair (stocky, weight-gain prone)

• •Easy keepers; watch portions closely
• •Puzzle feeders and wet-forward diets help prevent creeping weight gain

Siamese / Oriental breeds (lean, active, vocal)

• •Often higher energy; may need more calories per pound
• •They can also be dramatic about meal timing—more frequent meals can reduce “starving” behavior

Persian (flat-faced, texture preferences)

• •Some do better with specific kibble shapes or softer textures
• •Monitor intake if dental or grooming issues reduce appetite

When to Call the Vet (Portion Problems That Aren’t Just Food Math)

Feeding guides help, but certain signs mean you should get medical input:

• •Rapid weight loss or weight gain
• •Increased hunger with weight loss
• •Vomiting frequently or chronic diarrhea
• •Drinking/urinating more than usual
• •Senior cat losing muscle along the back or hips
• •Refusing food for 24 hours (or 12 hours for kittens)

Cats can develop hepatic lipidosis (fatty liver) if they stop eating, especially overweight cats. Don’t “wait it out.”

A Simple Starting Plan You Can Use Today

If you want an easy, realistic baseline while you fine-tune:

1. Pick a daily calorie target based on weight (use the chart above).
2. Feed 2–3 meals/day (or more, smaller meals if begging is an issue).
3. Make wet food the foundation if weight control or hydration is a concern.
4. Measure dry food by grams (or level cups at minimum).
5. Re-weigh and reassess BCS in 2–4 weeks and adjust calories by 5–10%.

If you tell me your cat’s:

• •weight
• •age
• •spayed/neutered status
• •indoor/outdoor activity
• •current food brand and kcal/cup or kcal/can

…I can help you calculate an exact daily portion plan.