When do puppies stop growing?

Small breeds (under 20 lbs): 9–12 months. Medium breeds: 12 months. Large breeds: 15–18 months. Giant breeds (over 100 lbs): 18–24 months. Larger dogs take much longer to mature.

How accurate are puppy weight predictions?

These are estimates based on average growth curves. Mixed breeds and dogs with health issues may deviate significantly. The best predictor is parent size.

Puppy Weight Calculator — Adult Size Estimate

Quick answer: Enter puppy's current weight and age to estimate adult weight and weeks to maturity.

Estimate how big your puppy will grow based on current weight, current age, and breed size. Uses growth milestone percentages to project adult weight.

Last reviewed: April 2026Report an error

Current Weight (lbs)

Current Age (weeks)

Size

Estimated Adult Weight

37.0 lbs

Estimated adult weight: 37.0 lbs. Currently 27.0% of adult weight.

Estimated Adult Weight (lbs)

37.0

% of Adult Weight

27.0%

Weeks to Adult

How to Use This Puppy Weight Calculator

1Enter your puppy's current weight in pounds.
2Enter your puppy's current age in weeks.
3Select breed size: small, medium, large, or giant.
4Read estimated adult weight and weeks until fully grown.

Frequently Asked Questions

: Small breeds (under 20 lbs): 9–12 months. Medium breeds: 12 months. Large breeds: 15–18 months. Giant breeds (over 100 lbs): 18–24 months. Larger dogs take much longer to mature.
: These are estimates based on average growth curves. Mixed breeds and dogs with health issues may deviate significantly. The best predictor is parent size.

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Puppy Weight Calculator — Adult Size Estimate

How to Use This Puppy Weight Calculator

Frequently Asked Questions

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