How much weight should a puppy gain per week?

Rule of thumb: puppies gain 5-10% of their body weight per week during the first 6 months. A 5 kg puppy should gain 250-500g per week. Growth slows after 6 months.

How accurate is the puppy weight predictor?

Within 10-15% for most dogs. Accuracy improves with age: predictions at 12 weeks are rougher than at 6 months. Mixed breeds are harder to predict. Knowing parent weights helps.

Can I use parent weight to predict puppy size?

Yes. Average of both parents weights is a good estimate. For mixed breeds, the larger parent has more influence on maximum size. Our calculator uses growth curves instead, which work without parent data.

Why do large breed puppies grow slower?

Large breeds have more growing to do and need controlled growth to avoid joint and bone problems. Too-fast growth in large breeds causes hip dysplasia and other orthopedic issues. Slow, steady growth is healthier.

How do I know my puppy breed size category?

By expected adult weight: Small under 10 kg, Medium 10-25 kg, Large 25-45 kg, Giant over 45 kg. If unsure, ask your vet or breeder, or check breed standard weights online.

Should I switch to adult food when growth stops?

Switch to adult food when your puppy reaches about 80% of adult weight. Small breeds: 8-10 months. Medium: 10-12. Large: 12-14. Giant: 14-18. Puppy food has extra calories and nutrients for growth.

Puppy Growth Calculator - Predict Adult Weight (2026)

Predicted Adult Weight

Based on current age, weight, and breed size

Adult Weight

16.7 kg

Grown

30%

Still to Gain

11.7 kg

Full Size At

12 mo

Growth Milestones

Age	Weight	% Grown	Status

// Pets · ShashaTools

Puppy Growth

Puppy’s Age 12 weeks

4w24m

Age in weeks (4-104). Ages above 12 weeks show as months.

Current Weight 5 kg

0.560

Breed Size

Unit

// Results

Adult Weight

16.7 kg

Predicted Adult

16.7 kg estimated

Growth Progress

30% of adult weight

Still to Gain

11.7 kg remaining

Full Size At

~12 months

Breed Size

Medium (10-25 kg)

5 kg at 12 weeks → ~16.7 kg adult (30% grown)

How to Use This Calculator

Predict your puppy’s adult weight

Step 1 Enter Info

Enter age in weeks

Your puppy’s current age. Starts at 4 weeks (earliest reliable data). After 12 weeks, the display shows months for convenience.

Enter current weight

Weigh your puppy today. Use a bathroom scale (weigh yourself holding puppy, then subtract). Accuracy matters for prediction quality.

Select breed size

Based on expected adult weight. Ask your breeder or vet if unsure. For mixed breeds, look at parent sizes or use current growth rate.

Read projections

Predicted adult weight, growth percentage, remaining gain, and when they will reach full size. The growth curve shows the full trajectory.

💡 Accuracy: Predictions are within 10-15% for most dogs. More accurate after 12 weeks. If your puppy is 20%+ above/below projection, consult your vet.

Step 2 Growth Tips

Don’t overfeed

Rapid growth causes joint problems, especially in large breeds. Steady, controlled growth is healthier. Chubby puppies are not healthy puppies.

Size-appropriate food

Large breed puppy food has controlled calcium and phosphorus to prevent bone problems. Small breed food has smaller kibble and higher calorie density.

Weekly weigh-ins

Weigh weekly for the first 6 months to track growth rate. Sudden jumps or plateaus can indicate health issues. Record weights to compare against the curve.

Switch to adult food

At 80% of predicted adult weight: transition to adult food over 7-10 days. Small: 8-10 months. Medium: 10-12. Large: 12-14. Giant: 14-18.

💡 Tip: The growth curve shows the typical S-shape: fast early growth, gradual slowdown, plateau at maturity. If your puppy’s weight is tracking the curve, they are growing normally.

// Related Calculators

🐕

Dog Age Calculator

Convert dog years to human years.

🍖

Dog Food Calculator

Daily calories and portions by weight.

🏃

Dog Exercise Needs

Activity requirements by age and size.

🏥

Pet Insurance Estimator

Insurance cost for your growing pup.

// Complete Guide — Updated 2026

Puppy Growth:
The Complete Guide

Watching a puppy grow is one of the most exciting parts of dog ownership. But how big will they actually get? And how fast should they be growing? This guide covers growth curves, milestone weights, feeding for healthy growth, and when different sizes reach maturity.

Growth Rate by Size

// When Puppies Reach Adult Weight

Small: 10 months • Medium: 12 months • Large: 14-16 months • Giant: 18-24 months

Most growth (60-70%) happens in the first 6 months

Growth Milestones

Age	Small	Medium	Large	Giant
8 weeks	30%	24%	20%	16%
6 months	75%	66%	55%	45%
12 months	100%	95%	80%	70%
18 months	100%	100%	98%	90%

Real-World Scenarios

Scenario 1: Predicting Adult Size. James has a 12-week-old Labrador (large breed) weighing 8 kg. At 12 weeks, a large breed is about 30% grown. Predicted adult: ~27 kg. Within the Lab standard of 25-36 kg. He should reach full size around 14-16 months. Use our Dog Food Calculator for feeding amounts.

Scenario 2: Mixed Breed Mystery. Maria adopted a mixed puppy at 8 weeks weighing 3 kg. Parents unknown. Using “medium” estimate: adult weight ~12.5 kg. If she selects “small”: ~10 kg. “Large”: ~15 kg. She re-checks at 6 months when the prediction is more accurate.

Scenario 3: Growth Concern. David’s 16-week-old German Shepherd (large) weighs 12 kg. Calculator says he should be about 40% grown, predicting ~30 kg adult. Male GSD standard: 30-40 kg. His puppy is on the lower end but growing consistently. No concern unless growth stalls.

Scenario 4: Giant Breed Care. Priya’s 20-week-old Great Dane (giant) weighs 18 kg. At 20 weeks, giant breeds are about 35% grown. Predicted adult: ~51 kg. She uses large breed puppy food with controlled calcium. Over-supplementing calcium in giant breeds causes bone deformities. Slow, steady growth is the goal.

💡 Key insight: The biggest mistake in puppy feeding is overfeeding “because they are growing.” Obesity in puppies causes lifelong joint problems. A puppy should have a visible waist and you should be able to feel (but not see) their ribs. Chubby is not cute — it is harmful.

Maturity Timeline

Small breeds	10 months
Medium breeds	12 months
Large breeds	14-16 months
Giant breeds	18-24 months

// Frequently Asked Questions

Common Questions About Puppy Growth

How big will my puppy get? +

Enter current age and weight. Small breeds: full size at 10 months. Medium: 12. Large: 14-16. Giant: 18-24 months.

When do puppies stop growing? +

Small: 10 months. Medium: 12. Large: 14-16. Giant: 18-24. Most growth (60-70%) in the first 6 months, then gradual filling out.

Weekly weight gain rate? +

5-10% of body weight per week first 6 months. A 5 kg puppy gains 250-500g/week. Growth slows significantly after 6 months.

Is my puppy the right weight? +

If 20%+ above/below projection, consult your vet. Visible waist, feel ribs but don’t see them = healthy weight.

How accurate is this? +

Within 10-15% for most dogs. More accurate after 12 weeks. Mixed breeds harder to predict. Knowing parent weights helps.

Can parent weight predict size? +

Yes. Average of parents is a good estimate. For mixed breeds, larger parent influences maximum size more.

Why do large puppies grow slower? +

More growing to do. Controlled growth prevents joint/bone problems. Too-fast growth in large breeds causes hip dysplasia.

How do I know breed size? +

By expected adult weight: Small <10 kg, Medium 10-25, Large 25-45, Giant 45+. Ask vet or breeder if unsure.

When to switch to adult food? +

At 80% of predicted adult weight. Small: 8-10 mo. Medium: 10-12. Large: 12-14. Giant: 14-18. Transition over 7-10 days.

Does neutering affect growth? +

Early neutering (<6 mo) may cause slightly taller growth (delayed growth plate closure). Effect on final weight is minimal (1-5%).

Puppy GrowthCalculator

Puppy Growth:The Complete Guide

Growth Rate by Size

Growth Milestones

Real-World Scenarios

Puppy Growth
Calculator

Puppy Growth:
The Complete Guide