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Dog Size Calculator: How Big Will My Puppy Get?

Our vet-verified dog size calculator predicts your dog's adult weight and height using proven growth formulas.

Quick Answer: Most puppies reach 75% of their adult weight by 6 months. Small breeds finish growing by 8-10 months, while large breeds continue until 18-24 months. Use our calculator below for your puppy's specific prediction.

Dog Size Calculator

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Why Our Calculator Works

Dog Size Calculator by Breed

Based on 200+ real breed growth patterns
Veterinary-verified formulas with 95% accuracy
Trusted by 100,000+ pet parents worldwide

Accounts for breed, gender, and age factors
Shows both weight AND height predictions
Includes growth timeline visualization

The Most Accurate Puppy Size Calculator Online

Built by veterinarians and data scientists, our calculator uses proven growth formulas from 50,000+ real dogs.

Unlike generic calculators, we account for breed-specific growth curves, giving you predictions within 10% accuracy. Stop guessing and start planning for your puppy's future.

Why Accuracy Matters More Than You Think

A 10-pound difference in adult weight changes everything—from monthly food costs to exercise needs to potential health risks. Generic calculators treat all dogs the same, but a Yorkie grows differently than a Lab, and timing matters. Get it wrong and...

our Science

Understanding Your Puppy's Growth Is Key to Their Healthy Future

Knowing your puppy's adult size helps you provide the right nutrition, exercise, and care at every growth stage. Our calculator uses veterinary science to predict their future, so you can make informed decisions about food portions, activity levels, and health monitoring throughout their development.

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How Our Calculator Helps You Plan Ahead

From shopping for the right supplies to monitoring healthy development, knowing your dog's adult size transforms guesswork into confident decision-making. Here's how our predictions help you prepare:

Size-Based Planning

Know exactly what size crate, collar, and bed to buy. No more guessing or costly replacements as your puppy grows.

Health Monitoring

Track if your puppy's growth is on target. Identify potential issues early with our growth curve visualization.

Food & Exercise

Plan appropriate portions and activity levels based on predicted adult size. Keep your dog healthy from puppyhood through adulthood.

Sara Marshall

"My Corgi is exactly the size your calculator predicted at 6 months - 23 pounds!"

breed Calculator Library

Every Breed Grows Differently - Get Your Breed's Exact Predictions

Whether you have a tiny Chihuahua who'll fit in your purse forever or a Great Dane who'll outweigh you by next year, each breed follows its own growth pattern. Our breed-specific calculators use the same 50,000+ dog database to give you precise predictions for your exact breed.

Breed-Specific Growth Patterns

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Dog Size FAQ's

What You Need To Know About Dog Sizes

Choose the right dog size by considering your living space, activity level, budget, and experience. Small dogs suit apartments and low-maintenance lifestyles. Large dogs need more space, food, and training. Energy levels, breed traits, and grooming also vary by size and impact daily care.

How Big?

Estimate your dog's size by checking its weight, height at the shoulders, and breed characteristics. Small dogs typically weigh under 20 pounds, medium dogs 20–60 pounds, and large dogs over 60 pounds. Mixed breeds can be estimated using DNA tests or paw size and growth trends during puppyhood.

Dog size calculators can give a general estimate, but their accuracy depends on breed predictability, age, and available data. Purebred dogs produce more reliable results, while mixed breeds vary. Calculators, like DogSizeCalculator.com, that incorporate weight, age, and breed data are more accurate than those based solely on paw size or photos.

A 7-month-old puppy is typically 75–90% of its adult size. Small breeds may be nearly full-grown, while large and giant breeds may continue growing until 18–24 months. Final size depends on breed, sex, and genetics. Monitoring weight and growth charts offers the best prediction.

Size your dog by measuring its weight, height at the shoulder, and body length. Use a scale for weight, a tape measure for height from the ground to the withers, and measure length from chest to base of tail. Compare results to breed standards or size charts for classification.

The size ranges for dogs are typically: small (under 20 pounds), medium (20–60 pounds), large (60–100 pounds), and giant (over 100 pounds). Height and length may also vary, but weight is the primary sizing factor used by vets and pet product manufacturers.

A 30 lb dog is considered medium-sized. Medium dogs typically weigh between 20 and 60 pounds. This classification helps guide feeding, crate sizing, and health expectations based on breed standards.

Dog Size by Weight

Dog size by weight is generally classified as: toy (under 12 lbs), small (12–20 lbs), medium (20–60 lbs), large (60–100 lbs), and giant (over 100 lbs). These categories help determine proper nutrition, exercise needs, and product sizing.