Siamese Cat Weight Chart by Age
Ideal weight ranges for male and female Siamese cats from birth to adulthood. Siamese cats are a lean, athletic breed — use this chart to track healthy growth and spot potential issues early.
Siamese Cat Weight by Age
Typical weight ranges for male and female Siamese cats at each life stage
| Age | Male Weight | Female Weight | Notes |
|---|---|---|---|
| Birth | 3–4 oz (85–115g) | 3–4 oz (85–115g) | Newborn, eyes closed |
| 1 month | 8–12 oz (225–340g) | 7–11 oz (200–310g) | Weaning begins |
| 2 months | 1.5–2.5 lbs (0.7–1.1 kg) | 1.3–2.2 lbs (0.6–1.0 kg) | Ready for adoption |
| 3 months | 2.5–3.5 lbs (1.1–1.6 kg) | 2.0–3.0 lbs (0.9–1.4 kg) | Rapid growth phase |
| 4 months | 3.5–4.5 lbs (1.6–2.0 kg) | 3.0–4.0 lbs (1.4–1.8 kg) | Active, playful |
| 6 months | 4.5–6.0 lbs (2.0–2.7 kg) | 4.0–5.5 lbs (1.8–2.5 kg) | Adolescent, lanky build |
| 9 months | 6.0–8.0 lbs (2.7–3.6 kg) | 5.0–7.0 lbs (2.3–3.2 kg) | Growth slowing |
| 12 months | 7.0–9.0 lbs (3.2–4.1 kg) | 5.5–7.5 lbs (2.5–3.4 kg) | Near adult size |
| 18 months | 8.0–10.0 lbs (3.6–4.5 kg) | 6.0–8.0 lbs (2.7–3.6 kg) | Fully grown |
| 2+ years (adult) | 8.0–12.0 lbs (3.6–5.4 kg) | 6.0–10.0 lbs (2.7–4.5 kg) | Maintenance weight |
Want personalized calorie recommendations for your Siamese?
Every cat is different. Get exact calorie needs based on your Siamese's weight, activity level, and life stage.
Try the Cat Calorie Calculator →Siamese Cat Body Condition Guide
Siamese cats have a distinctive lean, muscular build that's different from most domestic cats. Understanding their body type helps you assess healthy weight correctly.
Underweight
- Ribs, spine, hip bones visible
- No fat covering over ribs
- Severe waist tuck
- Muscle wasting visible
- Dull coat, low energy
Ideal Weight
- Ribs easily felt with light pressure
- Thin fat covering over ribs
- Visible waist from above
- Abdominal tuck from side
- Lean, muscular silhouette
Overweight
- Ribs hard to feel under fat
- No visible waist
- Belly hangs or is rounded
- Fat deposits near base of tail
- Lost the lean Siamese shape
Siamese Cat Varieties & Weight Differences
There are two main body types of Siamese cats, and they differ slightly in expected weight:
Modern (Wedge-Head) Siamese
The show-standard Siamese with a long, angular face, large ears, and very lean body. These cats tend to be on the lighter end of the weight range.
Males: 7–10 lbs | Females: 5–8 lbs
Traditional (Apple-Head) Siamese
The original Siamese type with a rounder face and slightly stockier build. Also called "Old-Style" Siamese. They tend to be heavier.
Males: 9–12 lbs | Females: 7–10 lbs
Check if your cat is at a healthy weight with our Cat BMI Calculator, or see weight charts for other breeds in our Cat Weight Guides. For feeding amounts, try the Cat Feeding Calculator.
Frequently Asked Questions About Siamese Cat Weight
Common questions about Siamese cat growth and healthy weight
How much should a Siamese cat weigh?
Adult male Siamese cats typically weigh 8–12 lbs (3.6–5.4 kg) and females weigh 6–10 lbs (2.7–4.5 kg). Siamese cats are a lean, athletic breed — they should look slender with visible muscle definition, not stocky.
When do Siamese cats stop growing?
Siamese cats reach their full size between 12–18 months of age. Males may continue filling out slightly until 2 years. They are a medium-sized breed that matures relatively quickly compared to larger breeds like Maine Coons (which grow until 3–4 years).
Are Siamese cats naturally thin?
Yes. Siamese cats are naturally lean and athletic with a long, tubular body shape. They should have a visible waist when viewed from above and a tucked abdomen from the side. What looks "thin" in other breeds is normal for a Siamese — don't overfeed to make them look bigger.
How do I know if my Siamese cat is overweight?
An overweight Siamese loses their distinctive sleek silhouette. Check: you should feel ribs easily with light pressure, see a waist from above, and notice an abdominal tuck from the side. If the belly hangs or ribs are hard to feel, they may be overweight.
How many calories does a Siamese cat need?
Adult Siamese cats typically need 200–300 calories per day depending on weight and activity level. Siamese are active cats, so they may need slightly more than sedentary breeds. Use our Cat Calorie Calculator for a personalized estimate.
Do Siamese cats gain weight easily?
Siamese cats are generally less prone to obesity than many breeds due to their active nature and lean body type. However, indoor Siamese cats that are sedentary or overfed can still become overweight. Monitor body condition regularly.
Check Your Cat's Weight & Health
Use our free calculators for personalized recommendations.