Feline obesity is at epidemic levels — an estimated 60% of indoor cats are overweight. Most of it comes down to overfeeding. Here's how to figure out the right portion for your specific cat.
Why the Bag's Feeding Chart Isn't Enough
Feeding charts on cat food bags are systematically generous:
- They assume average activity (most indoor cats are less active)
- They don't account for treats and table scraps
- Brands benefit from higher consumption
- "Adult cat" covers a wide range of needs
Use the chart as a starting point, then adjust based on body condition.
Calculate Daily Caloric Needs
Most adult cats need:
| Body Weight | Calories/Day (Indoor, Sedentary) | Calories/Day (Active) |
|---|---|---|
| 8 lb | 180-200 | 220-260 |
| 10 lb | 200-230 | 260-300 |
| 12 lb | 230-265 | 290-340 |
| 15 lb | 275-310 | 340-400 |
| 18 lb | 320-360 | 390-460 |
Adjust for:
- Indoor only: Use the lower (sedentary) numbers
- Spayed/neutered: Reduce by another 10%
- Senior (10+): Reduce by 10% unless underweight
- Kitten: 2-3x adult requirements during growth
- Overweight: Feed to target weight, not current weight
Convert Calories to Portion
Look at the kcal/cup or kcal/can listed on the bag. Examples:
- Most dry cat food: 350-450 kcal/cup
- 5.5 oz can of wet food: 150-200 kcal
- 3 oz pouch of wet food: 70-100 kcal
Example calculation: A 10-pound indoor adult cat needs about 215 calories/day. If kibble is 400 kcal/cup, that's about ½ cup per day, split into two meals of ¼ cup each. Or one 5.5 oz wet food can plus a small portion of kibble.
The Body Condition Score Test
Numbers are a starting point. The real test is looking at your cat. Vets use a 9-point Body Condition Score:
- 1-3: Underweight. Ribs visible, no fat cover, prominent backbone.
- 4-5: Ideal. Ribs easily felt with light fat covering. Visible waist from above. Minimal abdominal fat pad.
- 6: Slightly overweight. Ribs felt with more pressure. Waist hard to see.
- 7-9: Overweight to obese. Ribs hard to feel. No waist. Round body shape from above. Pendulous abdomen.
You want your cat at 4-5. Look down — you should see a clear waist behind the ribs. From the side, the belly should not hang significantly. Run hands along ribs — should feel them easily with light pressure.
Meal Frequency
- Kittens (under 6 months): 3-4 meals per day
- Kittens (6-12 months): 2-3 meals per day
- Adult cats: 2 meals per day standard, 3 if managing weight or insulin
- Senior cats: 2-3 smaller meals can be easier on aging GI systems
Avoid free-feeding (food out 24/7) for most cats. It makes portion control impossible and contributes to obesity.
Wet vs Dry: Different Caloric Densities
When feeding both wet and dry, the calorie math gets more complex:
Example: 12-lb indoor cat needing 240 cal/day, eating both wet and dry.
- One 3 oz pouch wet food: ~85 cal
- Remaining 155 cal from dry food at 400 kcal/cup = about ⅜ cup
This is more wet/dry balanced than feeding dry-only. For maximum hydration, lean toward more wet, less dry.
Treats Count
Treats should be no more than 10% of daily calories. For a 240-calorie diet, that's 24 calories of treats — which is less than you'd think (about 4-5 small treats). Beyond that, reduce main meal portions to compensate.
Weight Loss in Cats
If your cat is overweight, slow weight loss is critical. Aim for 1-2% body weight loss per week.
Crash diets in cats can cause hepatic lipidosis (fatty liver disease), which can be fatal. If your cat stops eating during a diet, contact your vet immediately.
Talk to your vet about a structured weight loss plan. Most overweight cats need 70-80% of their current intake initially, gradually adjusting.
Frequently Asked Questions
Why does my cat seem hungry all the time?
Many cats would eat constantly if allowed — it's not a reliable signal of need. If body condition is ideal and they're getting calculated portions, the begging is just behavior.
Should I weigh my cat regularly?
Monthly weigh-ins help catch trends. Use a baby scale or zero out a regular scale with a carrier. Sudden weight changes (in either direction) warrant a vet visit.
What if my cat refuses to eat the right portion?
Take the bowl away after 15-20 minutes. Cats are smart — they learn the schedule quickly. Don't add toppers or extra food just because they're not eating it.
The Bottom Line
Most cats need less food than the bag suggests. Calculate based on weight and activity, check body condition monthly, and adjust accordingly. Avoid free-feeding, count treats, and remember that slow changes are better than dramatic ones for cats.