Puppy weight calculator

How the estimate works

Puppies don’t grow in a straight line. They pile on weight fast in the first few months, then the curve flattens as they get close to adult size. How fast it flattens depends mostly on size. A Yorkie is close to full grown at nine months. A Great Dane is still filling out at eighteen.

The calculator takes your puppy’s current weight and divides it by the share of adult weight a typical puppy of that size has reached at the same age. If a large-breed puppy weighs 22 lb at 16 weeks, and large breeds are usually about 35% of the way there at that age, the estimate is 22 ÷ 0.35, or about 63 lb.

The shaded band on the chart shows a 15% margin either side. Most puppies land somewhere in that band. A few don’t, and that’s normal.

Why the estimate can be off

We built these curves from typical growth patterns for each size group, not from your puppy’s family tree. A few things can push a dog above or below the line:

• Parents’ size. If you know the mother and father, their weights are often the best clue there is.
• Mixed breeds. A Lab cross could end up anywhere from medium to large. Pick the group you think is most likely, then try the next one up to see the range.
• Body condition. A chubby puppy will throw the estimate high. A very lean one will push it low.
• Very early weights. Before about 12 weeks small differences grow into big errors, so the estimate gets better each time you weigh again.

When do dogs stop growing?

As a rough guide:

Height usually settles before weight. Many large dogs reach their full height around a year old, then spend the next six months or so broadening through the chest.

Paw size, and other old tricks

You’ve probably heard that big paws mean a big dog. There’s a little truth in it, since giant-breed puppies do have chunky feet, but it’s a poor way to put a number on adult weight. The same goes for the “double the weight at 16 weeks” rule some people use. It works for some medium dogs and misses badly for toy and giant breeds, which is why we use a curve for each size instead.

Feeding a growing puppy

An adult weight estimate is handy for choosing a crate, a bed or a harness that will still fit later. It also matters for food. Large and giant puppies should eat a diet made for large-breed puppies, which controls calcium and calories. Growing too fast can strain their joints.

For daily portions, our dog food calculator turns your puppy’s calorie needs into cups or grams of the food you actually use. Don’t try to make a puppy bigger or smaller with food. Feed for a lean body, where you can feel the ribs easily but not see them, and let genetics decide the final size.

Common questions