How To Use

Enter your puppy's current age and weight to predict how big they will get as an adult. Select your breed for the most accurate prediction, or choose a size category if breed is unknown.

Quick Steps

1 Enter your Puppy's Age in weeks.
2 Enter your Puppy's Current Weight in pounds.
3 Select your Breed (optional — auto-fills size category) or select a Size Category.
4 Click Calculate to see adult size predictions.

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Puppy Growth Calculator

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FAQs

Frequently Asked Questions

How accurate is the puppy size prediction?

Predictions are estimates based on established canine growth curves and are most accurate for purebred or size-typical dogs. Individual dogs vary due to genetics, nutrition, and health. The result is a range — use it as a guide rather than an exact figure.

When do puppies stop growing?

Toy and small breeds reach adult size around 10–12 months. Medium breeds finish growing at 12–15 months. Large breeds take 18–24 months and giant breeds can take up to 24–36 months to fully mature.

Is my puppy's weight healthy for their age?

Growth rates vary by breed and size. Puppies should gain weight steadily without becoming chubby or looking thin. You can feel but not prominently see the ribs of a healthy-weight puppy. Ask your vet at each check-up.

What if I don't know my puppy's breed?

Select the size category that best matches your puppy's expected adult size. If your puppy is a mix, use the size category of the larger parent breed as a rough guide. DNA tests can also give breed breakdown.

How often should I weigh my puppy?

Weigh puppies weekly for the first 3 months, then monthly until adulthood. Most vets have a scale in reception — pop in for a quick weigh-in anytime.

Does neutering affect my puppy's adult size?

Early neutering (before growth plates close) may result in a slightly taller but leaner dog, as hormones influence when growth plates close. The effect is minor in most breeds. Discuss timing with your vet.