Labrador Retriever Puppy Weight Calculator & Growth Chart
America's longtime favorite family retriever. Labs exhibit an athletic, water-retrieving build with heavy appetites requiring diligent caloric regulation throughout pediatric development.
Labrador Retriever Weight Calculator
Estimated Adult Weight
Labrador Retriever Pediatric Growth Trajectory
Biological sigmoid curve showing healthy weight progression by age (weeks).
Shaded area represents healthy ±1 standard deviation AKC breed corridor.
Growth Velocity Note
Rapid skeletal lengthening occurs between 8 and 20 weeks. Weight stabilizes around 12 months, followed by rib spring and chest broadening through 15 months.
Veterinary Feeding Guidance:
Avoid free-feeding; Labs carry a known POMC gene mutation that impairs satiety, making portion control vital for preventing juvenile orthopedic stress.
Labrador Retriever Week-by-Week Weight Milestones
Reference data for healthy Labrador Retriever puppies based on veterinary pediatric percentiles.
| Puppy Age | Expected Weight (lbs) | Expected Weight (kg) | Developmental Milestone |
|---|---|---|---|
| 8 Weeks (2 mo) | 10–15 lbs | 4.5–6.8 kg | Early juvenile coordination & weaning |
| 12 Weeks (3 mo) | 20–28 lbs | 9.1–12.7 kg | Rapid bone elongation phase |
| 16 Weeks (4 mo) | 30–42 lbs | 13.6–19.1 kg | ~50% mature adult weight reached |
| 24 Weeks (6 mo) | 45–60 lbs | 20.4–27.2 kg | Adolescent frame and muscle definition |
| 36 Weeks (8 mo) | 55–72 lbs | 24.9–32.7 kg | Skeletal height completion |
| 52 Weeks (12 mo) | 58–80 lbs | 26.3–36.3 kg | Mature weight and muscle consolidation |
When Do Labrador Retriever Growth Plates Close?
For the Labrador Retriever (large breed classification), epiphyseal growth plates typically close between 14–16 months. Until these cartilaginous zones calcify into solid bone, the skeletal structure is particularly vulnerable to impact trauma.
- Avoid repetitive high-impact jumping (such as off tall beds or out of SUVs).
- Postpone intense agility hurdles or forced running on concrete until growth plate fusion is complete.
- Maintain lean body condition: excess puppy fat places unnecessary biomechanical torque on immature ligaments.
Nutrition & Weight Maintenance
Caloric demand peaks between 8 and 16 weeks, during which puppies require up to twice the calories per pound of body weight compared to adult dogs.
Avoid free-feeding; Labs carry a known POMC gene mutation that impairs satiety, making portion control vital for preventing juvenile orthopedic stress. Weigh your puppy bi-weekly and adjust portions according to their body condition score (BCS) rather than bag recommendations alone.
Labrador Retriever Growth Velocity & Developmental Dynamics
Veterinary pediatric insights regarding growth curve trajectory, parentage size variations, and orthopedic protection.
Labrador Pediatric Growth & The POMC Satiety Mutation
Growth Plate Ossification & Exercise Caution
Labrador Retriever Weight & Size Questions
How big will my Labrador Retriever puppy get?
Adult male Labs weigh between 65 and 80 lbs with height of 22.5–24.5 in. Adult females weigh between 55 and 70 lbs with height of 21.5–23.5 in.
When do Labrador Retrievers stop growing?
Labradors reach full skeletal height between 11 and 12 months, but continue developing chest width and muscle mass until 14 to 16 months.
How much should a 4-month-old Lab puppy weigh?
At 16 weeks (4 months), a healthy Labrador Retriever puppy typically weighs between 30 and 42 lbs, which is roughly 45–50% of adult weight.