A Labrador is full grown at about 18 months, though there are really two answers hiding inside that one number. A Lab reaches close to its adult height by around its first birthday, then spends the next six months or so filling out in chest and muscle rather than getting taller. The Pawlicy Advisor Labrador growth guide puts a Lab at roughly 85 percent of full size at one year, with the heavier-boned dogs still broadening until about 18 months and some not settling at a final adult weight until two years.
Key facts
- Near-adult height arrives by about 12 months, then growth slows sharply per the Pawlicy Advisor Labrador growth guide
- Full muscle and chest fill-out lands around 18 months, with some Labs still adding weight to age 2
- An adult male stands 22.5 to 24.5 inches and weighs 65 to 80 pounds per the AKC Official Standard for the Labrador Retriever
- An adult female stands 21.5 to 23.5 inches and weighs 55 to 70 pounds, per the same AKC standard
The Labrador growth chart
The table below tracks a typical Lab from puppy to adult. Males generally run taller and heavier than females at every stage, so the higher end of each range tends to be a male and the lower end a female. The adult height and weight figures come from the AKC Official Standard for the Labrador Retriever; the earlier month-by-month weights are typical ranges from the Pawlicy Advisor Labrador growth guide and will vary with the individual puppy.
| Age | Stage | Typical weight | Typical height | What’s happening |
|---|---|---|---|---|
| 8 weeks | Puppy | about 10 to 15 lb | about 7 to 9 in | Just home; fast, steep growth begins |
| 3 months | Puppy | about 20 to 30 lb | about 10 to 13 in | Rapid bone growth; joints still soft |
| 6 months | Adolescent | about 40 to 55 lb | about 16 to 19 in | Roughly half to two-thirds of adult weight |
| 12 months | Young adult | about 55 to 75 lb | 21.5 to 24.5 in | Near-adult height reached; about 85 percent grown |
| 18 months | Adult | 55 to 80 lb | 21.5 to 24.5 in | Full grown; chest and muscle filled out |
When does a Labrador stop growing?
A Labrador stops growing in two phases, and height finishes first. Most Labs hit close to their adult height at around 12 months, which is why a one-year-old Lab can look full size and still feel lanky. Weight and muscle keep coming for several more months, with the Pawlicy Advisor Labrador growth guide noting that heavier-boned dogs broaden through the chest until about 18 months and some keep gaining until two years.
As a large breed, a growing Lab needs its joints protected during that long fill-out window. The growth plates are still closing through the first year, so hard, repetitive impact (long runs on pavement, repeated jumps off furniture, forced stair work) can strain hips and elbows that are not finished. Plenty of free play is fine; the thing to avoid is high-impact exercise forced on a body that is still building itself.
Keep your growing Lab lean. A puppy carrying extra weight puts more load on developing joints, and Labs are famously food-motivated, so the pounds arrive easily. You can see the adult size targets and lifespan numbers on the Labrador Retriever breed page.
Common questions
At what age is a Labrador fully grown? About 18 months. A Lab reaches near-adult height by roughly 12 months, then fills out in muscle and chest through about 18 months, with some dogs still adding weight until age 2, per the Pawlicy Advisor Labrador growth guide.
Do female Labradors stop growing earlier than males? Females tend to finish a little sooner and settle smaller. The AKC Official Standard for the Labrador Retriever puts adult females at 21.5 to 23.5 inches and 55 to 70 pounds, against 22.5 to 24.5 inches and 65 to 80 pounds for males, so a female reaches her smaller adult frame on a slightly shorter timeline.
At what age does a Labrador calm down? Most Labs start to settle around two to three years old, well after they finish growing. Physical maturity at 18 months does not mean mental maturity; the adolescent energy usually eases as the dog moves into full adulthood, helped by steady exercise and training.
A growth chart tells you when your Lab’s body is done. For where your Lab sits in human years, see your dog’s real age with the calculator, which uses the large-breed curve to give you a number that is actually true for your Labrador.
