1Emaciated
Ribs, spine, and bony points visible from a distance. No discernible body fat.
Veterinary attention required immediately.
Free Tool · 50+ Breeds · Body Condition Score Included
Cat Weight Calculator: Is My Cat a Healthy Weight?
Weight alone does not tell the whole story. Combine your cat's actual weight with a breed-specific healthy range and a 9-point Body Condition Score assessment.
Based on WSAVA BCS methodBreed-specific rangesSafe weight timeline
Check Your Cat's Weight and Body Condition
Luna's Weight Assessment
Overweight
Current Weight
5.2 kg
Luna is carrying about 0.6 kg above the estimated ideal weight for a female British Shorthair. A gradual plan is safest.
Weight Check
5.2 kg
Breed range: 3.5-5.5 kg
Within range
BCS Check
6 / 9
Slightly Heavy
Reduce daily calories by 10-15%. Increase play activity.
Estimated ideal weight
4.6 kg
Current difference
+0.6 kg
Weight Loss Plan
Target: 4.6 kgWeekly: 0.03 kgTime: ~19 weeks
Safety note: Never reduce food by more than 25% at once. Rapid weight loss can cause hepatic lipidosis.
Action plan
- Reduce daily calories gradually by 10-15% and reassess after two weeks.
- Switch part of the diet to wet food for better satiety per calorie.
- Add two 10-minute interactive play sessions each day.
- Use ideal weight, not current weight, when setting calorie targets.
- Use the Cat Food Calculator to turn the target weight into daily portions.
Mention weight at the next vet visit.
BCS Guide
Understanding Your Cat's Body Condition Score (BCS)
The 1-9 BCS system is more useful than scale weight alone because it accounts for fat cover, waist shape, and body frame.
2Very Thin
Ribs easily visible. Tops of lumbar vertebrae visible.
Increase food gradually. Vet check recommended.
3Thin
Ribs easily palpable with minimal fat covering.
Slightly increase daily portions. Monitor weekly.
4Lean Ideal
Ribs palpable with slight fat covering.
Maintain current feeding routine. Annual vet checkup.
5Ideal
Ribs palpable without excess fat covering.
Perfect condition. Maintain current diet and exercise.
Your Cat
6Slightly Heavy
Ribs palpable with slight excess fat covering.
Reduce daily calories by 10-15%. Increase play activity.
7Heavy
Ribs palpable with difficulty under fat cover.
Reduce calories carefully. Vet consultation recommended.
8Obese
Ribs not palpable under heavy fat cover.
Veterinary-supervised weight loss program required.
9Severely Obese
Ribs not palpable under very heavy fat cover.
Urgent veterinary attention required. Medical weight loss plan.
Breed Ranges
Healthy Weight Ranges by Cat Breed
A Maine Coon at 5 kg may be underweight; a Singapura at 5 kg is obese. Breed context matters.
| Breed | Category | Male Range | Female Range | Notes |
|---|---|---|---|---|
| Maine Coon | large | 6.0-10.0 kg | 4.0-7.0 kg | Largest domestic breed. |
| Ragdoll | large | 5.5-9.0 kg | 4.0-6.5 kg | Matures slowly over 3-4 years. |
| Norwegian Forest Cat | large | 5.0-8.0 kg | 3.5-6.0 kg | - |
| Siberian | large | 5.0-8.0 kg | 3.5-6.0 kg | - |
| British Shorthair | large | 4.5-7.5 kg | 3.5-5.5 kg | Stocky, muscular build. |
| Bengal | medium | 4.5-7.0 kg | 3.0-5.0 kg | Athletic and muscular. |
| American Shorthair | medium | 4.5-6.5 kg | 3.0-5.5 kg | - |
| Persian | medium | 4.0-6.0 kg | 3.0-5.0 kg | Dense coat can hide weight changes. |
| Scottish Fold | medium | 4.0-6.0 kg | 2.7-4.5 kg | - |
| Burmese | medium | 4.0-6.0 kg | 3.0-5.0 kg | Dense muscle for size. |
| Birman | medium | 4.0-6.5 kg | 3.0-5.0 kg | - |
| Siamese | medium | 3.5-5.5 kg | 2.5-4.5 kg | Naturally slender. |
| Russian Blue | medium | 3.5-5.5 kg | 2.5-4.5 kg | - |
| Abyssinian | medium | 3.5-5.5 kg | 2.5-4.5 kg | Lean athletic build. |
| Tonkinese | medium | 3.5-5.5 kg | 2.5-4.5 kg | - |
| Domestic Shorthair (Mixed) | mixed | 3.5-6.0 kg | 2.7-5.0 kg | Assess by BCS because frame varies. |
| Domestic Longhair (Mixed) | mixed | 3.5-6.0 kg | 2.7-5.0 kg | Long coat can disguise weight changes. |
| Devon Rex | small | 2.5-4.0 kg | 2.0-3.5 kg | - |
| Cornish Rex | small | 2.5-4.5 kg | 2.0-3.5 kg | - |
| Singapura | small | 2.5-3.5 kg | 1.8-2.7 kg | World's smallest domestic cat breed. |
All ranges represent healthy adult weight estimates for neutered cats. Individual variation exists; BCS remains essential.
Health Context
Why Cat Weight Matters: The Real Health Risks
Health Risks of Feline Obesity
Overweight cats have higher diabetes and arthritis risk.
- Diabetes mellitus from insulin resistance.
- Hepatic lipidosis if an overweight cat stops eating.
- Osteoarthritis from additional joint load.
- Urinary tract disease and grooming problems.
Health Risks of Being Underweight
Unexplained weight loss is a medical red flag.
- Muscle wasting and weakness.
- Immune suppression and slower healing.
- Hypothermia risk in very thin seniors.
- Possible thyroid, kidney, diabetes, cancer, or dental disease.
Safe Weight Loss for Cats
Never starve a cat to lose weight. Cats who stop eating for more than 24-48 hours are at risk of hepatic lipidosis.
- Step 1: Get a vet checkup first.
- Step 2: Calculate target calories from ideal weight.
- Step 3: Measure food with a kitchen scale.
- Step 4: Switch partly to wet food for satiety.
- Step 5: Weigh every 2 weeks and target 0.5-1% loss per week.
Helping an Underweight Cat Gain Weight
Persistent underweight should be medically evaluated before simply increasing calories.
- Step 1: Rule out dental pain, kidney disease, diabetes, thyroid disease, parasites, and cancer.
- Step 2: Increase meal frequency.
- Step 3: Use calorie-dense food short term if recommended.
- Step 4: Track weekly weight trends.
- Step 5: Escalate quickly if appetite drops.
Next Step
Turn the target weight into a feeding plan
Use the feeding calculator with your cat's ideal weight so daily calories match the goal.
Weight assessment
Use breed range and body condition together
A cat's scale weight is only meaningful when it is interpreted with body frame, breed, sex, and body condition. This page combines breed-specific ranges with a Body Condition Score so the result is not reduced to a single generic number.
Result guide
What matters most in the result
The Body Condition Score should carry more weight than the breed range when the two disagree. A large-framed cat can sit above a generic range and still be lean, while a small-framed cat can look normal on the scale but carry too much body fat.
- Ideal BCS is usually around 4-5 on a 9-point scale.
- Ribs should be easy to feel with light pressure, not hidden under a thick fat layer.
- A visible waist from above and a modest abdominal tuck from the side support an ideal result.
- Large weight changes without an intentional plan should be treated as a health signal.
Breed ranges are context, not permission
A breed range helps avoid comparing a Maine Coon to a Singapura, but the hands-on BCS check is what tells you whether the current body shape is healthy.
Slow change is safer
Weight loss should be gradual. The calculator's plan is meant to support measured portion changes, not sudden restriction.
Senior cats need extra caution
In older cats, weight loss can reflect muscle loss, dental pain, kidney disease, thyroid disease, or other medical issues, so unexplained change deserves veterinary attention.
Weight decisions
Decide whether to maintain, investigate, or start a plan
The best next step depends on whether the result shows a mild trend, a clear body-condition problem, or a sudden unexplained change. Treat those situations differently.
Ideal score
If breed range, body shape, and recent trend all look consistent, the goal is prevention rather than correction.
Keep portions steady and use monthly weigh-ins to catch drift early.
Mild overweight
A mild excess is often manageable with measured food, fewer hidden calories, and increased play, but the target should still be gradual.
Use the calorie or food calculator with ideal weight as the planning input.
Unexplained loss
Weight loss without a planned calorie deficit is different from successful dieting and can point to pain, dental disease, endocrine disease, kidney disease, or digestive issues.
Schedule a veterinary check instead of increasing calories blindly.
Monthly baseline
Weigh monthly for stable adult cats and record BCS at the same time.
Weekly plan checks
Use weekly weights during a weight-loss or weight-gain plan.
Immediate follow-up
Act quickly for rapid weight loss, appetite loss, vomiting, or weakness.
A useful monthly weight routine
1
Weigh on the same scale
Use the same scale and time of day so normal hydration and meal timing do not hide the trend.
2
Score the body, not just the number
Repeat the rib, waist, and side-view checks each month and compare them with the calculator result.
3
Connect weight to food
If a weight goal appears, use it as the target input for calorie and food calculations rather than guessing portions.
FAQ
Frequently Asked Questions About Cat Weight
How much should a cat weigh?
Most domestic cats should weigh between 3.5-5.5 kg, but healthy weight varies significantly by breed. Maine Coons can healthily weigh 6-10 kg, while Singapura cats may only weigh 2-3 kg. Body Condition Score is usually more useful than scale weight alone.
How do I know if my cat is overweight?
Use a 9-point Body Condition Score. At an ideal weight, you should be able to feel your cat's ribs without pressing hard, see a visible waist from above, and notice a slight abdominal tuck from the side.
What is a healthy weight for a cat?
Healthy weight depends on breed, sex, frame size, and body condition. For mixed-breed domestic cats, 3.5-5.5 kg is typical, but large and small breeds can fall well outside that range.
Is my cat overweight if they weigh 5kg?
It depends on breed and body frame. A 5 kg Singapura would likely be overweight, a 5 kg Domestic Shorthair may be near the upper end of normal, and a 5 kg Maine Coon may be underweight.
How can I help my cat lose weight safely?
Safe weight loss for cats is gradual: usually 0.5-1% of body weight per week. Never crash-diet a cat because rapid weight loss can cause hepatic lipidosis. Use measured portions, increase play, and involve your veterinarian.
What percentage of cats are overweight?
Studies commonly estimate that 50-60% of domestic cats in developed countries are overweight or obese, making weight control one of the most common preventable health issues in cats.
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