Last updated: October 3, 2026
Cat Weight by Age: Month-by-Month Chart
How much should a cat weigh at every age? This month-by-month cat weight chart runs from a newborn kitten through to a full-grown adult, with expected ranges in both pounds and kilograms. Use it as general guidance, then confirm with the numbers for your own cat.
Quick answer
Kittens gain roughly 1 lb (about 0.45 kg) per month for the first 6 months, reach about 5–7 lb (2.3–3.2 kg) by 6 months, and most are fully grown at 8–12 lb (3.6–5.4 kg) by 1 year. Large breeds like Maine Coons run higher and keep growing for years. See the full chart below, then check your cat with the Cat Weight Calculator.
Cat Weight Chart by Age (lb & kg)
Expected weight ranges for an average domestic cat from newborn kitten to senior
| Age | Weight (lb) | Weight (kg) | Notes |
|---|---|---|---|
| 2 weeks | 0.25–0.5 lb | 0.1–0.2 kg | Newborn stage, eyes opening, fully dependent on mother |
| 4 weeks (1 month) | 0.5–1.0 lb | 0.2–0.5 kg | Weaning begins, first wobbly steps |
| 6 weeks | 1.0–1.5 lb | 0.5–0.7 kg | Eating some solid food, very active |
| 8 weeks (2 months) | 1.5–2.0 lb | 0.7–0.9 kg | Fully weaned, ready for adoption |
| 12 weeks (3 months) | 2.0–4.0 lb | 0.9–1.8 kg | Rapid growth phase, roughly 1 lb gained per month |
| 16 weeks (4 months) | 3.0–5.5 lb | 1.4–2.5 kg | Still growing fast, baby teeth being replaced |
| 5 months | 4.0–6.0 lb | 1.8–2.7 kg | Lanky adolescent look, growth spurt continues |
| 6 months | 5.0–7.0 lb | 2.3–3.2 kg | About 75% of adult size, good time to spay or neuter |
| 7 months | 5.5–7.5 lb | 2.5–3.4 kg | Growth begins to slow, filling out |
| 8 months | 6.0–8.0 lb | 2.7–3.6 kg | Approaching adult frame, still adding muscle |
| 9 months | 6.5–8.5 lb | 2.9–3.9 kg | Near adult weight, growth slowing further |
| 10 months | 7.0–9.0 lb | 3.2–4.1 kg | Most cats close to final size |
| 12 months (1 year) | 7.0–10.0 lb | 3.2–4.5 kg | Most cats fully grown, switch to adult food |
| 18 months | 8.0–11.0 lb | 3.6–5.0 kg | Frame complete, may still fill out slightly |
| 2 years | 8.0–12.0 lb | 3.6–5.4 kg | Mature adult, maintenance weight |
| 3 years | 8.0–12.0 lb | 3.6–5.4 kg | Stable adult weight, monitor for creeping gain |
| Senior (11 years+) | 7.0–11.0 lb | 3.2–5.0 kg | Some natural weight loss, watch for sudden changes |
These are general ranges for a typical domestic cat. Small breeds run lighter (adults around 5–8 lb / 2.3–3.6 kg) and large breeds like the Maine Coon run much heavier (12–20 lb / 5.4–9 kg). Working in metric? See our cat weight kg to lb conversion guide.
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How Much Should a Cat Weigh at Each Age?
The ranges below cover an average domestic cat. Every cat is different, so use these as a starting point and always weigh body condition alongside the number on the scale.
How much should a kitten weigh (8, 12, and 14 weeks)?
At 8 weeks a kitten usually weighs 1.5–2 lb (0.7–0.9 kg), by 12 weeks around 2–4 lb (0.9–1.8 kg), and by 14 weeks roughly 2.5–4.5 lb (1.1–2.0 kg). A useful rule of thumb is that a healthy kitten gains about 1 lb (near 0.45 kg) every month for the first 6 months.
How much should a 3 month old cat weigh?
A 3 month old kitten typically weighs 2–4 lb (0.9–1.8 kg). This is a rapid growth phase, so weekly weighing is the best way to confirm steady progress. Large breeds will already sit at the top of this range or above.
How much should a 4 month old cat weigh?
A 4 month old cat usually weighs 3–5.5 lb (1.4–2.5 kg). Kittens are still growing quickly at this stage and losing their baby teeth. Steady gains matter more than hitting an exact number.
How much should a 5 month old cat weigh?
A 5 month old cat typically weighs 4–6 lb (1.8–2.7 kg) and often looks lanky as the legs grow ahead of the body. Continued steady gains are the sign of a healthy kitten heading toward adult size.
How much should a 6 month old cat weigh?
A 6 month old cat usually weighs 5–7 lb (2.3–3.2 kg) and has reached about 75% of its adult size. This is a common age for spaying or neutering, after which calorie needs drop and portions may need adjusting.
How much should a 7 month old cat weigh?
A 7 month old cat typically weighs 5.5–7.5 lb (2.5–3.4 kg). Growth is starting to slow now, and the cat is filling out rather than shooting up. Most cats are well on their way to their final frame.
How much should an 8 month old cat weigh?
An 8 month old cat usually weighs 6–8 lb (2.7–3.6 kg). By now the frame is close to adult, and the cat is mostly adding muscle and a little fill rather than length. Keep monitoring body condition as growth slows.
How much should a 9 month old cat weigh?
A 9 month old cat typically weighs 6.5–8.5 lb (2.9–3.9 kg) and is close to its adult weight. Growth is slow at this stage, so large jumps on the scale are more likely to be extra fat than new growth.
How much should a 10 month old cat weigh?
A 10 month old cat usually weighs 7–9 lb (3.2–4.1 kg). Most average domestic cats are near their final size by now, with only minor filling out left. Large breeds are the exception and continue growing well beyond this age.
How much should a 12 month old (1 year) cat weigh?
A 1 year old cat typically weighs 7–10 lb (3.2–4.5 kg) and is generally considered fully grown. This is the point to switch from kitten food to adult food and settle into a steady maintenance routine.
How much should a 2 year old cat weigh?
A 2 year old cat is a mature adult and typically weighs 8–12 lb (3.6–5.4 kg). Weight should be stable at this age, so watch for slow creeping gain, which is common in indoor cats and easy to miss.
How much should a senior cat weigh (10 years and older)?
A senior cat (10 years and older) usually weighs 7–11 lb (3.2–5.0 kg), often a little less than in its prime as muscle mass naturally declines. Sudden or unexplained weight loss in a senior cat is a common early sign of illness and warrants a vet visit.
Cat Growth Milestones by Age
Understanding how growth is paced helps you read the chart above. Weight gain is not steady across a cat's first years, it front-loads heavily into the first few months.
- Birth to 6 months, fastest growth: Kittens grow most rapidly in the first half-year, gaining roughly 1 lb (about 0.45 kg) per month and reaching around 75% of their adult size by 6 months.
- 6 to 12 months, growth slows: After 6 months the pace tapers off. Cats fill out and add muscle rather than length, and most reach their full adult weight by 12 months.
- Large breeds keep going: Big breeds such as Maine Coons, Ragdolls, and Norwegian Forest Cats break the usual timeline and continue growing until 3–5 years of age, which is why they far outweigh an average cat at every stage.
Because growth is front-loaded, big weight jumps in an adult cat almost always mean added fat rather than new growth. To predict where a still-growing kitten will end up, use our how big will my cat get guide.
A note on using these numbers
Every chart on this page is general guidance for an average domestic cat, not a diagnosis. Breed, frame, sex, and whether a cat is spayed or neutered all shift the healthy range. Body condition, feeling the ribs and seeing a waist, matters more than any single number. If your cat sits well outside these ranges for its age, or its weight changes suddenly, check with your veterinarian.
Related Cat Weight Guides & Tools
This page is the by-age and growth angle. To go deeper on a specific question, use these related guides and calculators:
- How big will my cat get? Predict a kitten's adult size from its current age, weight, and breed.
- Cat Weight Calculator Check your cat against healthy ranges by frame, breed, and age.
- Average cat weight by breed Compare weight ranges across popular cat breeds.
- Cat weight kg to lb The metric and conversion angle, with quick kg and lb conversions.
- Cat Weight Guides Every guide on cat weight, growth, and feeding in one place.
Frequently Asked Questions About Cat Weight by Age
Common questions about how much a cat should weigh at each age
How much should a 6 month old cat weigh?
A 6 month old cat typically weighs 5–7 lb (2.3–3.2 kg). By this age most kittens have reached about 75% of their adult size. Large breeds like Maine Coons will be heavier and keep growing for much longer.
How much should a 1 year old cat weigh?
A 1 year old cat usually weighs 7–10 lb (3.2–4.5 kg) and is generally considered fully grown. Small breeds sit at the lower end around 5–8 lb, while large breeds run well above this range.
How much should a 2 year old cat weigh?
A 2 year old cat is a mature adult and typically weighs 8–12 lb (3.6–5.4 kg). This is maintenance weight for an average domestic cat. Check body condition rather than the number alone, since a healthy weight depends on frame and breed.
How much should a kitten weigh by week?
A rough guide is that kittens gain about 1 lb (roughly 0.45 kg) per month for the first 6 months. Newborns weigh 3–4 oz, reach about 1.5–2 lb by 8 weeks, and 5–7 lb by 6 months. Weekly weighing is the best way to confirm steady growth.
At what age is a cat fully grown?
Most cats reach their adult size by 12 months, with growth slowing noticeably after 6 months. Large breeds such as Maine Coons, Ragdolls, and Norwegian Forest Cats are the exception and keep growing until 3–5 years of age.
Is my cat overweight for its age?
Age gives you an expected range, but body condition tells you if your cat is actually overweight. You should be able to feel the ribs with light pressure and see a waist from above. If you cannot, your cat may be carrying extra weight, so check with your vet.
Check Your Cat's Weight by Age
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