🐾 Puppy Weight Calculator

Labrador Puppy Weight by Age

Labradors are a large size class dog, which means two things for weight expectations: they grow for longer than most owners assume, and they are around 88% of adult weight — not 100% — on their first birthday. This page pairs the published breed-standard adult range with a week-by-week expectation table and the calculator, preset to the large class.

The breed-standard adult range

Breed standard range (AKC): male Labrador Retrievers about 65–80 lb (29–36 kg); females about 55–70 lb (25–32 kg).

That is a breed standard, not a census: it describes the range the breed club considers correct for a well-proportioned adult in working condition. Plenty of healthy pet Labradors sit outside it, and the informal "English"/show type is often described as heavier-boned and stockier than the leaner "American"/field type — a difference in build that the single standard range does not break out. Use the range as an anchor, not a verdict.

Expected Labrador puppy weight by age

Every cell below is the breed-standard adult range multiplied by the percentage of adult weight a large-class puppy has typically reached at that age, with a ±15% band. It is a derived expectation table, not measured data from a cohort of Labradors.

Age % grown Male (kg) Male (lb) Female (kg) Female (lb)
8 wks ≈ 2 mo ~17% 4.2–7.0 9–16 3.6–6.3 8–14
12 wks ≈ 3 mo ~28% 7–12 15–26 6–10 13–23
16 wks ≈ 3.5 mo ~38% 9–16 21–35 8–14 18–31
20 wks ≈ 4.5 mo ~47% 12–19 26–43 10–17 22–38
26 wks ≈ 6 mo ~58% 14–24 32–53 12–21 27–47
34 wks ≈ 8 mo ~70% 17–29 38–64 15–26 33–57
44 wks ≈ 10 mo ~82% 20–34 45–75 17–30 38–67
52 wks ≈ 12 mo ~88% 22–36 48–79 19–32 41–71
72 wks ≈ 16.5 mo ~100% 25–36 54–79 21–32 47–71

Approximate. Derived from the breed-standard adult range and the large-breed percentages on our puppy growth chart, rounded and banded ±15%. A healthy Labrador puppy can sit outside these bands; body condition assessed by your vet matters more than matching a table.

8–104 weeks (≈ 6 months)
Expected adult size class

Pick by the adult size you expect (parents are the best guide). Large: e.g. Labrador, Golden Retriever, German Shepherd.

Estimated adult weight (combined range)

27–37kg(59–80 lb)

Union of the two methods below. A range is the honest answer — no formula can predict one exact number for a growing puppy.

Method A: growth-fraction

27–37kg

At 26 weeks, large-class puppies are at roughly 58% of adult weight (approximate table, ±15%). Adult estimate = current weight ÷ fraction.

Method B: simple linear rule

36kg

(current weight ÷ age in weeks) × 52. Simple linear rule — least accurate for large and giant breeds, and it tends to overshoot for toys. Included in the combined range above.

Growth stage:Adolescent growthPast the halfway point of typical weight gain — the growth rate is slowing but not finished (large breeds mature at about 15-18 months).

Estimate only — growth varies by breed, diet and genetics; two healthy littermates can end up at very different adult weights. Confirm anything that matters with your vet.

Preset to the large size class with a six-month-old Labrador — enter your own puppy's weight and age.

Three worked examples

A male Lab at 18 kg (40 lb), 26 weeks

Large-class puppies are around 58% grown at six months, so 18 ÷ 0.58 ≈ 31 kg, banded to 27–37 kg (59–80 lb). That lands squarely inside the 29–36 kg breed-standard band, in its upper half — this is a puppy tracking toward a solidly built adult male. For comparison, the simple linear rule gives 36 kg, near the top of the standard; past 26 weeks that rule starts drifting toward the current weight, which is why we stop folding it into the headline range.

A female Lab at 8.5 kg (19 lb), 14 weeks

At 14 weeks the large-class figure is ~33%, so 8.5 ÷ 0.33 ≈ 26 kg, banded to 22–30 kg (49–67 lb). The female standard range is 25–32 kg, so this puppy is on a normal trajectory for a female Lab. The linear rule says 32 kg — higher, because at 14 weeks it is extrapolating fast early growth across a whole year.

Reading it backwards: a 26-week male at 30 kg (66 lb)

The table's six-month male band is 14–24 kg, and 30 kg is above it. Run through the calculator, the fraction method projects 45–61 kg — above the breed standard entirely. Two ordinary explanations: this is a big-framed dog that will simply exceed the standard, or the puppy is carrying weight it does not need. A calculator cannot tell the difference; a vet running a body-condition score can, in under a minute. Labradors are widely noted for being food-motivated and prone to gaining excess weight, so this is worth checking rather than assuming.

How to weigh a Labrador puppy at home

Under about 15 kg, a bathroom scale plus arithmetic works: weigh yourself, weigh yourself holding the puppy, subtract. Above that, the puppy usually will not stand still, and most vet clinics let you use the lobby walk-on scale free of charge — which also produces a consistent number across visits. Weigh at the same time of day relative to meals, and record it: the trend across several weigh-ins is the useful signal, not any single reading.

Common questions

How much should a Lab puppy weigh at 8 weeks?

The derived band above is 4.2–7.0 kg for males and 3.6–6.3 kg for females — but eight-week weights are the noisiest of all, because litter size, weaning and a couple of days' age difference all move them. Treat this row as the loosest in the table.

When do Labradors stop growing?

As a large breed, typically around 15–18 months for weight, with adult height reached earlier. A one-year-old Labrador is usually close to its adult frame but still filling out. There is a full breakdown in when do dogs stop growing.

Is my Lab puppy overweight?

That is a body-condition question, not a weight question: you should be able to feel the ribs easily under a thin fat cover and see a waist from above. A puppy above the table band with a clear waist is probably just big; one at the band with no waist may still be carrying too much. Ask your vet — that is exactly what the visit is for.

Related guides

The other large retriever in the same size class is covered in Golden Retriever puppy weight, which includes a side-by-side comparison of the two breed standards. For the percentages behind every number here, see the puppy growth chart, and to run any other puppy's numbers use the puppy weight calculator. Curious how old your Lab will be in human years? Our sibling tool the Dog Age Calculator applies the same no-fake-precision rules to dog years.

Estimate only — growth varies by breed, diet and genetics; confirm with your vet.