Track your kitten's weight against standard feline growth curves week by week. See if your kitten is on track for healthy development.
Monitoring your kitten's weight weekly is one of the best ways to ensure healthy development. Kittens gain weight rapidly in their first months, typically adding 0.25 to 0.5 pounds per week until they reach about 4-5 months of age. A kitten that falls below or jumps above the expected growth curve may need veterinary attention.
Standard feline growth curves, developed from large-scale veterinary data, provide benchmarks for average kitten weight at each week of age. Healthy kittens generally weigh about 3-4 ounces at birth, reach 1 pound by 4 weeks, 2 pounds by 8 weeks, and continue gaining steadily until they approach adult weight around 10-12 months.
This calculator compares your kitten's current weight to the expected weight for its age in weeks. Enter the age and actual weight, and you'll see whether your kitten is tracking at, above, or below the average growth curve — giving you an early heads-up if nutritional or health adjustments are needed.
Early weight tracking catches problems like malnutrition, parasites, or congenital issues before they become serious. A kitten that consistently lags behind the growth curve may need deworming, dietary changes, or veterinary evaluation. Conversely, excessive weight gain can signal overfeeding. This calculator puts growth-curve data at your fingertips. Instant recalculation lets you explore different options and scenarios, ensuring your pet-care decisions are guided by accurate, reliable numbers.
Expected weight (lbs) ≈ 0.25 × age in weeks (for weeks 1-16) Deviation = (actual − expected) / expected × 100% Note: Growth slows after 16 weeks; the calculator uses a piecewise curve for older kittens.
Result: On track — expected ~2.0 lbs
At 8 weeks, the average kitten weighs approximately 2.0 lbs (0.25 × 8). An actual weight of 2.0 lbs means your kitten is right on the growth curve with 0% deviation.
Kittens hit several key milestones: eyes open at 7-10 days, ears unfold at 2 weeks, first wobbly steps at 3 weeks, weaning starts at 4 weeks, and they can eat solid food exclusively by 8 weeks. Weight gain typically mirrors these developmental stages.
Breed, litter size, nutrition quality, parasite load, and whether the kitten is nursed or bottle-fed all influence growth. Single kittens or small litters often grow faster due to less competition for milk. Orphaned kittens on formula may grow 10-15% slower.
Consult a vet if your kitten loses weight at any age, fails to gain for two or more consecutive weeks, or develops a pot-bellied appearance (which may indicate worms). Early intervention gives the best outcomes for underweight kittens.
Weigh kittens weekly for the first 16 weeks, then every two weeks until 6 months. After that, monthly weigh-ins are sufficient unless there are health concerns. Neonatal kittens (under 2 weeks) should be weighed daily.
A slight deviation (under 10%) is normal. If your kitten is 15% or more below expected weight, check for parasites, ensure adequate feeding frequency, and consult your vet. Deworming alone often resolves growth lag.
Being 10-15% above average is often fine, especially for large breeds. However, excessive weight can stress developing joints. Ensure you're following feeding guidelines and not free-feeding unlimited dry food.
Most domestic cats reach adult weight between 10-12 months. Large breeds like Maine Coons and Ragdolls may continue growing until 3-4 years. Average adult domestic cats weigh 8-11 pounds.
Yes, male kittens tend to grow faster and reach a higher adult weight than females. By 12 weeks, male kittens are often 0.5-1 lb heavier than female littermates. This calculator uses average values for both genders.
Healthy newborn kittens typically weigh 3-4 ounces (85-113 grams). They should double their birth weight by 7-10 days. Kittens under 3 ounces at birth are considered underweight and need close monitoring.