The honest range: from lap-sized to very large
A Bernedoodle — a Bernese Mountain Dog crossed with a Poodle — can get much bigger than many buyers picture. At the top end, a Bernese crossed with a Standard Poodle commonly produces adults in the seventy to ninety pound range, and occasional males exceed that, standing around knee-to-hip height on an average adult and filling a doorway in the way only a Bernese-shaped dog can. At the other end, pairings using a Miniature Poodle produce dogs often in the twenty-five to fifty pound band, with a middle 'medium' group in between. The label on the litter matters far less than the actual dogs in front of you.
That spread surprises people because the puppies look similar at eight weeks. They are not: the growth curves diverge for months, and Bernese heritage keeps filling a dog out well past the first birthday, often to eighteen months or beyond. Buy for the adult the parents predict, not the puppy in your arms.
Predicting from the two parents
Ask the breeder for both parents' real numbers: weight, and height at the shoulder, measured rather than estimated, and written down for you. If the father is a visiting stud, ask for his owner's figures and a photograph next to something of known scale. Your centre estimate for a puppy is roughly the average of the two parents' weights, with two adjustments breeders see repeatedly: male puppies tend toward the larger parent, and puppies generally lean toward the mother's size when the parents differ greatly, because she sets the early growth environment.
Then ask about previous litters from the same pairing. A breeder who has repeated this cross can tell you the actual adult weights their earlier puppies reached, which is better evidence than any formula. If this is a first pairing, expect a wider range and treat the larger parent's size as a genuine possibility for your puppy — plan your car, crate, home space and food budget so that outcome would still work.
Generation and growth-rate clues
Ask which generation the litter is. A first cross between a pure Bernese and a pure Poodle gives the widest scatter, because each puppy inherits a different shuffle of two very different size blueprints. Later generations and backcrosses to Poodle usually tighten the range and shrink it, since more of the ancestry is Poodle-sized. Paw size at eight weeks is the famous folk predictor and is only loosely useful; steady weekly weight gain compared with the breeder's records of earlier litters tells you more.
Feed for controlled growth whatever the predicted size: giant-breed-pattern puppies should grow slowly and lean, because rapid weight gain loads developing joints. Your vet can plot your puppy's curve at each visit and tell you whether he is tracking toward the predicted adult or past him, while there is still time to adjust portions.
Planning for the dog the parents describe
Size drives everything downstream — the crate you buy twice if you guess small, the car harness, the grooming bills for a large curly coat, the strength needed on the lead during adolescent enthusiasm. Meet the mother at minimum, stand next to her, and imagine that dog, or a larger male version, asleep across your hallway. If that picture works, the Bernedoodle's famously affectionate, clownish temperament may fit you beautifully.
Record what the breeder showed you while it is fresh, because KinsLe Transferrable Profiles lets your Bernedoodle's profile move from the breeder to you with both parents' sizes, health records and early routines preserved, giving your vet and groomer the full starting picture.