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Kitten weight chart: average weight by age
Kittens gain weight quickly in the first weeks and months of life, but the numbers vary by breed, litter size, and individual development. This chart gives typical weight ranges from birth to 12 months so you can track your kitten’s progress and know when a deviation is worth a call to your vet.
Kitten weight by age: birth to 8 weeks
In the first four weeks, daily weight gain is the most reliable sign of health. A scale that reads in grams — a digital kitchen scale works perfectly — lets you catch a problem days before visible signs appear. Healthy neonates gain roughly 10 to 15 grams per day. No gain over 24 hours is a veterinary concern; weight loss is urgent.
| Age | Typical weight | Daily gain (healthy) | Notes |
|---|---|---|---|
| Birth | 2.8–4.2 oz (80–120 g) | — | Should nurse within 2 hours; colostrum is critical |
| 3–4 days | 3.5–5 oz (100–140 g) | 10–15 g | Umbilical cord falls off; weigh daily if mother is absent |
| 1 week | 4–5.5 oz (113–155 g) | 10–15 g | Cannot thermoregulate; eyes and ears sealed |
| 2 weeks | 5.5–7 oz (155–200 g) | 10–15 g | Eyes begin to open; wobbling attempts to walk |
| 3 weeks | 7–9 oz (200–255 g) | 10–15 g | First solid steps; litter box introduction begins |
| 4 weeks | 9–12 oz (255–340 g) | 10–15 g | Active play starts; weaning introduction begins |
| 6 weeks | 12–16 oz (340–454 g) | 8–12 g | Running and climbing; learning bite inhibition |
| 8 weeks | 1.5–2 lb (680–900 g) | 5–10 g | Typical rehoming age; first vet visit and vaccines |
For everything happening in the first 8 weeks — warmth requirements, feeding schedule, stimulation, and milestones — see our newborn kitten care guide.
Kitten weight by age: 2 to 12 months
After weaning, weight gain slows from the neonatal sprint to a steadier climb. A rough rule of thumb for small to medium domestic breeds is roughly 1 pound per month in the first 6 months, though the pace varies. Large breeds gain faster in the first year and continue growing for years longer.
| Age | Small/medium breeds | Large breeds (Maine Coon, Ragdoll, NFC) | Monthly gain (approx.) |
|---|---|---|---|
| 2 months | 1.5–2 lb (680–900 g) | 2–2.5 lb (900–1,100 g) | — |
| 3 months | 2–3 lb (900–1,360 g) | 2.5–3.5 lb (1,100–1,600 g) | 0.5–1 lb |
| 4 months | 3–4 lb (1,360–1,800 g) | 3.5–5 lb (1,600–2,300 g) | 0.5–1 lb |
| 5 months | 4–5 lb (1,800–2,300 g) | 5–6.5 lb (2,300–3,000 g) | 0.5–0.75 lb |
| 6 months | 5–6 lb (2,300–2,700 g) | 6–8 lb (2,700–3,600 g) | 0.25–0.5 lb |
| 7–9 months | 6–8 lb (2,700–3,600 g) | 8–11 lb (3,600–5,000 g) | Slowing; body filling out |
| 10–12 months | 7–10 lb (3,200–4,500 g) | 9–14 lb (4,100–6,400 g) | Approaching adult weight |
| Adult (fully mature) | 7–10 lb (3.2–4.5 kg) | 10–18 lb (4.5–8 kg) | Large breeds mature at 3–5 years |
For a complete month-by-month picture of what changes beyond weight, see the kitten growth stages guide. For feeding amounts that support healthy growth, see the kitten feeding schedule by age.
How to weigh your kitten at home
Weighing your kitten monthly — or weekly for young kittens and any cat who is unwell — is one of the simplest things you can do to catch problems early. Two methods work well at home:
Digital kitchen scale (best for kittens under 2 kg): Place a small bowl or folded towel on the scale, tare it to zero, then gently set the kitten inside. Read the grams. This works well for neonates and young kittens who will sit briefly in a contained space. A reading accurate to 1 gram lets you spot even small day-to-day changes.
Bathroom scale subtraction (best for older kittens): Step on the scale alone and note your weight. Step on again holding the kitten and note the combined weight. Subtract. This is less precise but quick enough for a monthly check on a wriggling adolescent who won’t sit still.
Log every reading in KittenSchedule. A single number tells you nothing; a trend over 4 to 8 weeks tells you everything. A kitten who was gaining 0.5 lb per month and has stalled for 6 weeks is worth a vet conversation. A kitten who is gaining much faster than the chart after 6 months is worth discussing too.
Body condition score: what to look and feel for
Weight is only half the picture. Two kittens can weigh exactly the same and be in very different health states depending on their frame. Body condition scoring (BCS) adds the other half by assessing how fat and muscle are distributed over the skeleton. Most veterinarians use a 1-to-9 scale.
| BCS score | Category | What you see and feel |
|---|---|---|
| 1–2 | Severely underweight | Ribs, spine, and hip bones visually prominent; deep abdominal tuck; no fat cover anywhere; muscle wasting visible |
| 3 | Underweight | Ribs and spine easily felt and visible; waist is pronounced; no palpable fat; abdomen noticeably tucked |
| 4 | Lean-ideal | Ribs felt easily with minimal fat cover; visible waist from above; slight abdominal tuck; spine felt but not prominent |
| 5 | Ideal | Ribs felt with light pressure; waist visible from above; slight tuck; well-proportioned appearance |
| 6 | Slightly overweight | Ribs felt but with slight excess fat; waist visible but not pronounced; little to no abdominal tuck |
| 7 | Overweight | Ribs hard to feel through fat layer; waist barely visible or absent; rounding of the abdomen |
| 8–9 | Obese | Ribs not palpable; no visible waist; pronounced abdominal fat pad; fat deposits at neck, limbs, and back |
A score of 4 to 5 is ideal for most kittens and adult cats. A 3 warrants a feeding review and vet check; a 6 or 7 warrants a food and exercise conversation. Anything at 2 or 8–9 needs veterinary attention. Your vet will score your kitten at wellness visits — but practicing the rib feel at home between visits keeps you connected to your kitten’s actual condition rather than only the number on a scale.
When weight gain is too slow
Slow or absent weight gain in kittens has several common causes. In neonates, the most urgent is inadequate milk intake — either the mother isn’t producing enough or the kitten isn’t nursing effectively. In older kittens, the most common causes are intestinal parasites, inadequate caloric intake, illness, or a dental issue that makes eating painful.
Signs that warrant a vet call regardless of age:
- No weight gain over 24 hours in a kitten under 4 weeks
- Weight loss at any age
- Diarrhea or vomiting alongside poor weight gain
- Lethargy, weakness, or reduced interest in play
- Poor coat condition — dull, patchy, or rough fur
- Pot-bellied appearance combined with slow weight gain (common sign of heavy parasite burden)
Intestinal parasites are very common in kittens and can quietly drain nutrition even when the kitten is eating normally. The kitten deworming schedule explains what’s given, when, and why your vet may recommend treatment before symptoms appear.
When weight gain is too fast
Overfeeding kittens is less common than underfeeding but does happen, particularly when multiple household members offer food without coordinating or when a kitten moves from free-choice kitten food to a less active lifestyle. Rapid weight gain in the second half of kittenhood — roughly 6 months onward — is worth discussing with your vet because fat cells laid down in kittenhood persist into adulthood.
If your kitten’s BCS climbs above 6, review the amount and type of food with your veterinarian before reducing calories independently. Kittens need a calorie-dense diet for growth; cutting too aggressively at the wrong time can interfere with healthy development. Your vet will help you find the right balance for your kitten’s frame, age, and activity level.
Factors that affect kitten weight
Charts show averages across breeds and litter sizes. Individual variation is wide. The following factors legitimately shift where your kitten lands on any chart:
- Breed: A Singapura or Devon Rex naturally matures at 5–7 lb. A Maine Coon may reach 16–18 lb. Neither is wrong for its frame.
- Litter size: Kittens from larger litters often start smaller due to competition for milk. This gap usually closes by 6–8 weeks if all kittens are feeding well.
- Sex: Intact males typically grow heavier than females; neutering timing affects body composition but not frame size.
- Early nutrition: Kittens who received adequate colostrum and early milk from a healthy mother tend to start stronger. Bottle-fed kittens can thrive but may start from a lower baseline.
- Parasite history: A single deworming round can produce a visible weight jump as nutrient absorption normalizes.
- Illness or stress: Even mild illness or rehoming stress can temporarily flatten the growth curve. A plateau during a known stressor that rebounds within 1–2 weeks is usually not a concern; a stall that persists is.
Tracking weight in KittenSchedule
Keeping a weight log by memory is unreliable — a 5-gram change over two weeks is invisible without a written record. KittenSchedule lets you log each weight entry alongside feeding notes, vet appointments, and vaccine dates so everything is in one place when you have a vet conversation. The free app generates your kitten’s full schedule automatically from their birth date, including vet visit reminders during the weight-critical early months.
When to call your vet about weight
Most weight questions can wait for the next scheduled wellness visit. Call sooner for any of the following:
- Neonatal kitten (under 4 weeks): no weight gain over 24 hours
- Any kitten: weight loss, not just slow gain
- Rapid weight gain combined with pot-bellied appearance (parasites)
- Weight loss alongside increased thirst and urination (possible diabetes or kidney issue)
- Sudden weight loss in an otherwise healthy kitten who was gaining normally
- Weight that is dropping while appetite seems normal (malabsorption)
- Weight that is normal on the scale but BCS score is 3 or below (muscle loss without scale drop)
If your kitten’s weight falls outside the typical ranges on this chart, your vet is your best resource — not a different chart. They have your kitten’s breed history, exam findings, and parasite test results. The chart is a starting point for noticing; the vet is who you talk to when you notice something.
Frequently asked questions
How much should a kitten weigh at 8 weeks?
A typical domestic kitten weighs roughly 1.5 to 2 lbs (680 to 900 g) at 8 weeks. A kitten who passes the readiness checklist — fully weaned, using the litter box, playing actively — is generally ready to go to a new home at this weight, but your veterinarian will confirm healthy development at the first exam.
How much weight should a kitten gain per week?
In the first 4 weeks, healthy kittens gain roughly 10 to 15 grams per day (70 to 100 grams per week). After weaning, weight gain slows to roughly 0.25 to 0.5 lbs per month for small and medium breeds. If your kitten has gained nothing over 24 hours as a neonate, or is losing weight at any age, contact your veterinarian promptly.
When do kittens stop gaining weight?
Most small and medium breeds reach adult weight between 10 and 12 months. Large breeds such as Maine Coons, Ragdolls, and Norwegian Forest Cats continue adding mass until 3 to 5 years of age. A kitten’s frame largely determines when it stops growing, so breed history matters. Your veterinarian can assess body condition and confirm healthy development at annual visits.
Is my kitten too skinny?
On a 1-to-9 body condition scale, a score of 1 to 3 is underweight. You should be able to feel your kitten’s ribs easily, but they should not be visually prominent. A spine or hip bones that stick out visibly, a tucked abdomen, or a dull coat are signs worth discussing with your veterinarian. Underlying illness, parasites, or inadequate feeding are the most common causes in kittens.
How do I weigh my kitten at home?
A digital kitchen scale that measures in grams works well for kittens up to about 2 kg. Place a small bowl or container on the scale, tare it to zero, then set the kitten inside for a quick reading. For heavier kittens, weigh yourself on a bathroom scale, pick up the kitten, weigh again, and subtract. Log the result in KittenSchedule so you can spot trends over days or weeks rather than relying on memory.