Labrador Retriever Puppy Weight Calculator & Growth Chart
This Labrador puppy weight calculator is pre-loaded with the breed's published adult range — 25–36 kg (55–79 lb). Enter your Lab puppy's age and today's weight, and the estimate appears instantly: an adult-weight band, where your puppy sits inside the large-breed growth corridor, and a confidence grade based on how complete your inputs are.
It is one of the dedicated tools in our breed series. The puppy weight calculator homepage covers all 74 breeds in one place, the all calculators directory lists every tool on the site, and if your question is about portions rather than size, the puppy feeding & calorie calculator turns a weight into daily grams and calories.
Puppy Weight Calculator
Adult weight estimate, growth chart, and size match — updates as you type.
Your estimate appears here
Add age and current weight on the left — the estimate updates instantly as you type.
How big will my Labrador puppy get? The quick answer
An adult Labrador Retriever weighs 25–36 kg (55–79 lb) and stands about 55–68 cm (22–27 inches) at the shoulder. Males typically finish at the top of that band and females at the bottom, and field-bred Labs often run leaner than show-bred ones. Growth follows a predictable arc: a Lab puppy is roughly 30% of its adult weight at 8 weeks, passes half of it around 3 months, and crosses 90% near 6 months — then spends the next ten months quietly adding chest, muscle, and density rather than height.
The chart below is the honest, data-backed version of the folk rule that a puppy doubles its 4-month weight. For Labradors that rule runs hot: the size-class midpoint at 16 weeks is about 19 kg, and doubling it would predict a 38 kg adult — above the breed's published ceiling. The calculator therefore projects from your puppy's tracked percentile inside the growth corridor, which is why a light-tracking and a heavy-tracking littermate get different (and more accurate) answers than any single multiplier can give.
Adult Labrador weight: the published range, split by sex
Our engine stores one adult range per breed — for the Labrador that is 25–36 kg (55–79 lb), which lines up with the breed-standard weights published by kennel clubs. The official standard narrows the band by sex, and that split is the single most useful piece of context when you judge your own dog's number.
| Dog | Breed-standard weight | Breed-standard height (withers) |
|---|---|---|
| Adult male Lab | 65–80 lb (29–36 kg) | 22.5–24.5 in (57–62 cm) |
| Adult female Lab | 55–70 lb (25–32 kg) | 21.5–23.5 in (55–60 cm) |
| Calculator breed band (all Labs) | 55–79 lb (25–36 kg) | 55–68 cm (22–27 in, large-size class) |
Note the two height figures: the 55–68 cm row is the generic band for the large size class (all 74 breeds in it), while the 57–62 cm / 55–60 cm rows are the Labrador-specific breed standard. When you judge your own dog, the breed-standard height is the better reference; the calculator uses the size class to place your puppy inside the right growth corridor.
Lab puppy growth chart by week (large-size corridor)
The table below is the week-by-week growth corridor our calculator uses for every large-size puppy, including Labradors. Read it as a healthy range, not a target line: a Lab puppy anywhere inside the band at a given age is on a normal trajectory. What matters most is that your puppy keeps tracking the same relative position over time — a puppy holding the 70th percentile since 8 weeks is growing exactly as it should, even if a littermate sits at the 40th.
| Age | Healthy range (kg) | Healthy range (lb) | ≈ % of adult weight |
|---|---|---|---|
| 8 weeks · 2 months | 6–12.5 kg | 13–28 lb | ≈ 30% |
| 12 weeks · 3 months | 9.2–18.5 kg | 20–41 lb | ≈ 45% |
| 16 weeks · 4 months | 12.8–25.5 kg | 28–56 lb | ≈ 63% |
| 20 weeks · 5 months | 15.8–31.5 kg | 35–69 lb | ≈ 78% |
| 24 weeks · 6 months | 18.5–36.5 kg | 41–80 lb | ≈ 90% |
| 52 weeks · 12 months | 22–45 kg | 49–99 lb | adult range reached |
The last row is the whole large-size class band (22–45 kg), which is wider than the Labrador-specific breed band above it — a working Rottweiler and a lean field Lab share the class but not the ceiling. The "% of adult weight" column compares the corridor midpoint with the Labrador breed midpoint of 30.5 kg, so it is calibrated to this breed rather than to the class.
Tracking tip
Weigh your Lab weekly until 6 months, then every two weeks — same scale, same time of day, after a potty break. Write the number down; the trend is the signal, not any single weigh-in.
Lab-specific warning
Roughly one in four Labradors carries a POMC gene variant that increases food motivation and body weight. A "always hungry" Lab is often genetically normal, not underfed — feed to body condition, never to appetite.
Don't chase the number
Never feed a puppy to hit the projected adult weight faster. Fast growth in large breeds is the main modifiable risk factor for hip and elbow dysplasia — slow and lean wins. Portion guidance lives in our feeding calculator.
One breed, one corridor — but males, females, show lines, and field lines occupy different parts of it.
Male vs female Lab puppies: when the curves split
For the first 12–14 weeks, male and female Lab puppies grow on practically the same curve — littermates of both sexes are often within a kilogram of each other. The divergence starts around 4 months and accelerates through adolescence: males add weight faster and for longer, finishing about 10 lb (4–5 kg) heavier at the same shoulder height on average. This is why the calculator's sex selector moves the projected band more than almost any other optional input after the 4-month mark.
The practical takeaway: judge a female Lab against female expectations and a male against male expectations. A 6-month-old female at 38 lb is comfortably inside her corridor; a 6-month-old male at 38 lb is tracking small for his sex but may still be perfectly normal for a petite line. Sex matters less before 4 months — early differences between siblings are mostly individual percentile, which the calculator already accounts for.
When do Labradors stop growing?
In three stages. Height arrives first: most Labs are at or near their adult shoulder height by 12 months. Muscle and chest depth continue filling until about 16 months, which is the maturity point our engine uses for the large size class. Finally, "settling" — the mental and metabolic shift into adulthood — can stretch to 2 years, which is why many Labs famously keep puppy energy long after their skeleton is done.
The late fill-in phase is where owners most often misread their dog. A 10-month-old Lab that looks lanky and narrow is not underweight — it is mid-transition, and the last 10–15% of body weight is still ahead of it. The mirror error also exists: an 8-month-old Lab that already looks chunky is carrying fat, not early maturity, because skeletal growth in large breeds cannot be safely accelerated. The growth chart above keeps both errors in check: compare the scale number to the age band, then let body condition be the referee.
English vs American Labradors: does the line change the math?
Both types share the same breed standard, but they sit differently inside it. English (show-type) Labs are blockier, thicker through the chest and head, and typically land at the upper half of the weight band for their sex. American (field-type) Labs are longer-legged, leaner, and often 5–10 lb lighter at the same height — a working female from trial lines can be lean and healthy at 55 lb, while a show-line male commonly exceeds 75 lb without being overweight.
The calculator does not need the line type: it works from your puppy's actual tracked weight, which already encodes whatever the genetics are. But knowing the line explains the estimate when it differs from a friend's Lab of the same age — you are probably both right. If anything looks inconsistent between the projected band and the mirror test, body condition wins over both.
Labrador weight and health: why the growth curve matters extra
Labradors have a double reason for careful growth tracking. First, as a large breed, they are susceptible to developmental joint disease — hip and elbow dysplasia — and repeated studies show that rapid growth and excess weight in puppyhood are among the main modifiable risk factors. Keeping a Lab puppy lean through its first year slows growth to the pace the joints were designed for. This is why large-breed puppy formulas exist, and why the "grow slow and lean" note in the calculator result is aimed squarely at dogs like yours.
Second, the breed's famously enthusiastic relationship with food has a genetic basis. A 2016 study in Cell Metabolism found that a deletion in the POMC gene — present in about 23% of Labradors — is associated with greater food motivation and higher body weight. POMC-bearing Labs are not broken; they simply experience hunger differently, and their owners need to be the ones holding the measuring cup. Measured meals, treats under 10% of daily calories, and regular weigh-ins are the whole strategy.
None of this makes weight a diagnosis. If your puppy's weight suddenly leaves the corridor it has always tracked — especially with vomiting, diarrhea, lethargy, a pot-bellied look, or a visible rib cage — that is a veterinary visit, not a recalculation. The chart catches trends; your vet interprets them.
A kitchen scale and a note on your phone are all the equipment a good growth record needs.
How this Labrador calculator produces its estimate
The estimate runs on the same engine as the main puppy weight calculator, with one input already chosen for you: the breed selector is pre-set to Labrador Retriever, which applies the published 25–36 kg adult band as a prior. Your puppy's current age and weight are matched against the large-size growth corridor, and the percentile your puppy occupies inside that corridor is projected onto the breed band — a heavier-tracking puppy gets a higher projected adult number, a lighter-tracking one a lower number, from the same inputs.
Optional inputs sharpen the band. Sex splits the expectation after 4 months. Parent weights (the mother's especially) refine mixed-line estimates. The body-condition slider corrects the single most common distortion: a chubby weigh-in reads as "bigger puppy" when it is really "better-fed puppy." Every estimate also shows the classic breeder formula — (weight ÷ weeks) × 52 — as a cross-check, and grades its own confidence honestly: high with breed, sex, and ideal condition; lower for early or unusual weigh-ins. The full math is documented on the formula page on our homepage.
A weighing routine that actually works for Lab puppies
Labs grow so fast between 8 and 20 weeks that a monthly weigh-in misses the trend entirely. The routine that works: weigh weekly until 6 months old, then every two weeks until a year. Use the same scale every time — a bathroom scale with the subtract method (weigh yourself, weigh yourself holding the puppy) for big puppies, or a kitchen scale for 8-week-olds. Weigh before breakfast, after the morning potty break; meals, water, and bladder contents can swing a small puppy's number by 5%.
Log the numbers and re-run the calculator at each one. What you are watching for is a steady relative position: percentile drift of more than roughly 15 points between visits is the pattern that deserves attention, while a puppy that has tracked the 60th percentile since 8 weeks is telling you everything is fine even if a neighbor's Lab at the same age weighs twice as much. Growth records are also the first thing a good vet asks for when something looks off — bringing a printed history turns a vague "he seems small" into a useful conversation.
Labrador puppy weight FAQs
How big will my Labrador puppy get?+
Most Labrador Retrievers land between 55 and 79 lb (25–36 kg) as adults — males at the upper half of that band, females at the lower half. Our Labrador puppy weight calculator turns your puppy's current age and weight into a personalized adult range, not just a breed average: it maps your puppy onto the large-size growth corridor and projects the same percentile forward. A 16-week Lab weighing 20 lb is tracking to a different adult number than a 16-week Lab weighing 30 lb, and the calculator captures that difference immediately.
When is a Labrador Retriever fully grown?+
Labradors reach their adult height around 12 months but keep filling out in chest and muscle until roughly 16 months — our growth engine uses 16 months as the maturity point for the large size class. That means the scale number you see at 8 or 10 months is not final: most Labs add 10–15% more body weight after their first birthday. Do not panic if your 9-month-old Lab looks leggy and narrow; the breed fills in late compared with smaller dogs.
How much should an adult Labrador weigh?+
The breed standard runs 65–80 lb (29–36 kg) for males and 55–70 lb (25–32 kg) for females, but the honest answer is a body condition, not a number. You should feel ribs under a thin fat layer, see a waist from above, and see a belly tuck from the side. A muscular field-line male can be lean at 68 lb while a show-line female can be overweight at 70 lb. If you are deciding daily portions, use our feeding calculator to convert calories into grams or cups.
Why is my Lab puppy bigger or smaller than the chart?+
Three normal reasons. First, sex: male and female growth curves diverge sharply after 4 months. Second, line: English (show-type) Labs run heavier and blockier than American (field-type) Labs at the same height. Third, individual percentile: a puppy that has tracked the 80th percentile of its litter since 8 weeks is usually staying near it, which is why the calculator projects your puppy's own percentile rather than the breed mean. A sudden jump off the puppy's established percentile is the pattern worth a vet conversation.
Is my Labrador puppy overweight?+
Run the rib test: with light pressure you should feel individual ribs, and your puppy should have a visible waist. Labs are genetically predisposed to food obsession — roughly one in four carries a POMC gene variant linked to increased appetite and body weight — so they are the breed most likely to fool you into overfeeding. Keep treats under 10% of daily calories, measure meals instead of free-feeding, and use our puppy feeding calculator for daily gram targets. Persistent rib invisibility or a round belly merits a weigh-in at the vet.
Other large-size breeds you can estimate right now
Labradors share their growth corridor with the other large-size breeds in our registry. Each card opens the main calculator pre-filled with that breed's published adult range, so you can compare corridors breed by breed — useful for mixed-Lab households wondering which side of the family the size came from. The full breed quick-start list covers all 74 breeds.
Golden Retriever
Adult range 55–75 lb (25–34 kg)
Open prefilled calculator →
German Shepherd
Adult range 49–88 lb (22–40 kg)
Open prefilled calculator →
Standard Poodle
Adult range 44–71 lb (20–32 kg)
Open prefilled calculator →
Rottweiler
Adult range 79–134 lb (36–61 kg)
Open prefilled calculator →
Boxer
Adult range 50–80 lb (22.7–36.3 kg)
Open prefilled calculator →
German Shorthaired Pointer
Adult range 45–70 lb (20.4–31.8 kg)
Open prefilled calculator →
Sources & further reading
- American Kennel Club — Labrador Retriever breed standard (adult weight and height ranges). akc.org/dog-breeds/labrador-retriever
- Raffan E., et al. (2016). A Deletion in the Canine POMC Gene Is Associated with Weight and Appetite in Obesity-Prone Labrador Retriever Dogs. Cell Metabolism 23(5) — the POMC variant present in about a quarter of Labs.
- Salt C., et al. (2017). Growth Standard Charts for Monitoring Bodyweight in Domestic Dogs. PLOS ONE 12(2): e0172061 — the growth-curve approach our corridors are modeled on.
- Hawthorne A.J., et al. (2004). Body-Weight Changes during Growth in Puppies of Different Breeds. The Journal of Nutrition 134(8) — the developmental timing behind the late fill-in phase in large breeds.
- WSAVA Global Nutrition Guidelines & Pet Nutrition Alliance calorie tables — the RER-based calorie math cross-referenced by our puppy feeding & calorie calculator.
Estimates are informational only and are not veterinary advice. A puppy whose weight falls outside its established trend — especially with other symptoms — should be examined by a veterinarian. Last updated: October 29, 2026.
Tracking more than one thing?
Our puppy weight calculator projects adult size for all 74 breeds, and the feeding & calorie calculator turns any weight into daily portions. Both run entirely in your browser.