Puppy weight chart and calculator
Enter your puppy's age and weight today to get an estimated adult weight range. The chart below shows how much of its adult weight a typical puppy of each size has reached by each age. Small breeds are nearly done by nine months, while giant breeds are still growing at a year.
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Puppy growth curves by size
Puppy weight chart by age
These are typical weights for an example dog of each size. Your puppy will not match a column exactly. What matters is following a smooth curve of its own.
| Age | Toy adult ~7 lb | Small adult ~18 lb | Medium adult ~40 lb | Large adult ~70 lb | Giant adult ~120 lb |
|---|---|---|---|---|---|
| 8 weeks | 1.8 lb | 4.0 lb | 7.2 lb | 9.8 lb | 12.0 lb |
| 12 weeks | 2.8 lb | 6.5 lb | 12.0 lb | 16.1 lb | 20 lb |
| 16 weeks | 3.9 lb | 9.0 lb | 16.8 lb | 23 lb | 30 lb |
| 20 weeks | 4.7 lb | 11.2 lb | 21 lb | 30 lb | 40 lb |
| 24 weeks | 5.4 lb | 13.0 lb | 25 lb | 36 lb | 49 lb |
| 7 months | 6.1 lb | 14.9 lb | 30 lb | 45 lb | 62 lb |
| 9 months | 6.6 lb | 16.7 lb | 35 lb | 55 lb | 78 lb |
| 12 months | 7.0 lb | 18.0 lb | 39 lb | 64 lb | 96 lb |
How the estimate works
At each age a puppy of a given adult size has typically reached a certain share of its final weight. For example, a medium puppy is often around 40% grown at 16 weeks. Dividing today's weight by that share gives an adult estimate, and the calculator widens it by 15% either way because breeds and individual dogs vary a lot. Mixed breeds, and puppies whose adult size nobody knows, vary most of all.
The old rules of thumb work the same way: "double the weight at four months" for a medium dog, or "the weight at six months is about two-thirds of adult". These curves are those rules, smoothed across ages and sizes.
What this cannot tell you
This is not a diagnosis. A weight estimate cannot tell you whether your puppy is healthy, too thin or overweight. Your vet does that by looking at body condition: you should be able to feel the ribs easily without seeing them, and see a waist from above. A puppy gaining unusually fast or slowly, or one who stops gaining, should see a vet.
Questions people ask
How can I tell how big my puppy will get?
Divide today's weight by the share of adult weight a puppy of that size typically has at that age. For a medium puppy at 16 weeks that is around 40%, so a 15 lb puppy points to roughly 30 to 41 lb as an adult. The calculator above does this for every age and size.
How much should my puppy weigh at 4 months?
It depends on the adult size. A 4-month-old toy puppy may be under 5 lb, a medium one around 15 to 20 lb and a giant one over 30 lb. The chart above shows typical figures for each size.
When do puppies stop growing?
Toy and small breeds are usually near adult weight by 9 to 12 months, medium breeds by about 12 months, large breeds by 12 to 18 months and giant breeds by 18 to 24 months.
Is my puppy's paw size a good predictor of adult size?
Not a reliable one. Paws can hint that a puppy is still growing, but weight at a known age, compared with the right size curve, is a better guide.
My puppy weighs more or less than the chart. Is that a problem?
Not by itself. The chart is an average. What matters is steady growth along the puppy's own curve and a healthy body condition: ribs easy to feel but not see, and a visible waist. Your vet can check this.
Is this calculator accurate?
It is an estimate from average growth curves, which is why it gives a range instead of a single number. Mixed breeds and puppies of unknown size vary most. It is not a diagnosis.
Puppy Routine is not veterinary advice, and neither is this page. Anything about your puppy's health or a behaviour that worries you is a conversation with a veterinarian or a qualified, reward-based behaviour professional.