Adult Dog Weight Predictor
Predict your puppy's adult weight using breed-size formulas. Small breeds: 6-week weight × 4, Medium: 14-week × 2.5, Large: 20-week × 2, Giant: 24-week × 2.
Puppy Growth Chart Calculator
Track your puppy's weight-by-age against standard breed-size growth curves. See if your puppy is on track for healthy development with percentile ranges.
weeks
lbs
lbs
Expected Weight at This Age⧉
21.0 lbs
Based on 30% growth curve
Actual % of Adult Weight⧉
28.6%
Expected: ~30% at 16 weeks
Growth Status⧉
On Track
Difference: -1.0 lbs from expected
Weight Remaining⧉
50.0 lbs
~1.02 lbs/week to reach 70 lbs
Weeks to Maturity⧉
49
~11.3 months to full size
Est. Daily Food⧉
0.8 cups
Rough estimate; adjust per food brand label
Growth Progress
28.6%
ExpectedActual
Growth Milestones (large)
| Week | % of Adult | Expected (lbs) | Progress |
|---|---|---|---|
| 4 | 8% | 5.6 | |
| 8 | 15% | 10.5 | |
| 12 | 22% | 15.4 | |
| 16 | 30% | 21.0 | |
| 20 | 40% | 28.0 | |
| 24 | 50% | 35.0 | |
| 32 | 65% | 45.5 | |
| 40 | 80% | 56.0 | |
| 52 | 90% | 63.0 | |
| 65 | 100% | 70.0 |
Planning notes, formulas, and examples
About the Puppy Growth Chart Calculator
Watching your puppy grow is one of the most exciting parts of pet ownership, but it's important to ensure they're developing at a healthy rate. Puppies that grow too fast — especially large breeds — can develop joint and bone problems, while underweight puppies may not be getting adequate nutrition.
This Puppy Growth Chart Calculator lets you compare your puppy's current weight against standard growth curves for small, medium, large, and giant breed dogs. Simply enter your puppy's age in weeks and current weight, select their breed size category, and quickly see whether they're tracking within normal developmental ranges.
The calculator uses veterinary growth data that maps expected weight as a percentage of adult weight at various ages. Most puppies reach 50% of their adult weight by around 4-5 months and 90% by 9-12 months depending on breed size, with giant breeds taking up to 18-24 months to fully mature.
When This Page Helps
Regular weight monitoring catches nutritional deficiencies, overfeeding, and health issues early. A puppy falling below the growth curve may have parasites, digestive problems, or need a food change. A puppy far above the curve — particularly in large breeds — may need calorie reduction to protect developing joints. This calculator gives you objective data to share with your veterinarian at checkups.
How to Use the Inputs
- Weigh your puppy on a scale (a bathroom scale works — weigh yourself, then hold the puppy and subtract).
- Enter your puppy's current age in weeks.
- Enter the current weight in pounds.
- Select the breed size category.
- Enter the expected adult weight for the breed (check AKC breed standards or ask your vet).
- Review where your puppy falls on the growth curve — the expected weight and percentage of adult weight reached.
Formula used
Expected weight at age = Expected adult weight × growth percentage at age
Growth percentage by age (approximate):
8 weeks: ~15% of adult weight
16 weeks: ~30%
24 weeks: ~50%
36 weeks: ~75%
52 weeks: ~90-100% (small/medium) or ~80% (large/giant)Example Calculation
Result: On track — expected ~21 lbs at 16 weeks
A large breed puppy expected to weigh 70 lbs as an adult should be around 30% of adult weight at 16 weeks, or approximately 21 lbs. At 20 lbs, this puppy is within the normal range and tracking well along the growth curve.
Tips & Best Practices
- Weigh your puppy weekly for the first 6 months, then bi-weekly until 1 year.
- Large and giant breed puppies should not grow too fast — controlled growth protects their joints.
- Growth spurts are normal; a single weigh-in below the curve isn't cause for alarm.
- Mixed breed puppy sizes can be estimated by averaging the parents' weights.
- Consult your vet if your puppy's weight deviates more than 15-20% from the expected range.
- Keep a log of weekly weights to identify trends rather than reacting to a single measurement.
Understanding Puppy Growth Phases
Puppy growth follows a predictable S-curve. The fastest growth occurs between 2-6 months when puppies may gain several pounds per week for large breeds. Growth then gradually slows, tapering off as the puppy approaches their adult weight.
Why Breed Size Matters
Small breed puppies reach maturity quickly, often by their first birthday. Giant breeds like Great Danes take up to two years. This difference means large breed puppies need carefully controlled nutrition — high-protein, moderate-calorie diets designed for large breed growth to prevent skeletal problems.
Using Growth Data at Vet Visits
Bringing a growth log to your vet appointments helps them spot trends you might miss. A puppy consistently below the curve may need testing for parasites or metabolic issues, while one consistently above may benefit from a feeding adjustment.
Sources & Methodology
Last updated:
Frequently Asked Questions
Small breeds typically reach full size by 10-12 months, medium breeds by 12-14 months, large breeds by 14-18 months, and giant breeds may not finish growing until 18-24 months. Bone growth and muscle filling continue after height is reached.
You should be able to feel (but not prominently see) your puppy's ribs. If ribs are very visible, consult your vet before increasing food. Worm infestations are a common cause of underweight puppies.
Yes, especially for large and giant breeds. Rapid growth increases the risk of hip dysplasia, osteochondritis, and other developmental orthopedic diseases. Controlled, steady growth is healthier than maximum growth.
They provide good general guidelines, but individual puppies vary based on genetics. A puppy from smaller parents within a breed will naturally track lower. The curves represent averages across the breed size category.
Estimate the expected adult weight based on the parents (if known) or your vet's estimate, then use the corresponding size category. Mixed breeds generally follow the same growth patterns as purebreds of similar size.
Small fluctuations are normal, especially around meal times or after exercise. Weigh at the same time of day for consistency. If weight drops or plateaus for more than 2 weeks, consult your veterinarian.
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