PetMeasure

Puppy Weight Calculator

The surest guide to how big a puppy will get is its breed. Pick yours below to see the typical adult weight range — then open the breed page for the full picture.

Predicted adult weight

50–90 lb

a typical adult German Shepherdlarge.

Every breed (181)

Where the numbers come from: 121 of these breeds show the weight published in the American Kennel Club’s official breed standard, in pounds as published; the other 60 come from Wikidata under the open CC0 license, converted from kilograms. Each breed page names the source it used, and shows the second one where the two disagree. A weekly check re-reads both and fails if any figure has drifted — we don’t hand-edit these values.

This doubles as a dog weight calculator and a dog size calculator: the adult weight range and its class — small, medium, large or giant — tell you roughly how big a puppy will get once it is full-grown. The chart further down works as a puppy growth calculator and a puppy size calculator, week by week. For a mixed-breed puppy, expect an adult size between its parents’ breeds.

Puppy growth chart: what a German Shepherd weighs week by week

This is the growth curve FEDIAF publishes for a dog whose expected adult weight matches the breed selected above — an average, valid from 8 weeks to one year. FEDIAF notes itself that growth patterns show a certain individual variability, so read a row as the middle of a spread, not a target to hit. Weigh your puppy regularly and watch the direction of travel rather than any single week.

Expected weight by age — German Shepherd, average adult weight 31.8 kg. Source: FEDIAF Nutritional Guidelines 2025, Table VII-8a.
AgeWeight% of adult weight
8 weeks14 lb (6.6 kg)21%
10 weeks20 lb (9.2 kg)29%
12 weeks25 lb (11.3 kg)36%
14 weeks29 lb (13.1 kg)41%
16 weeks32 lb (14.7 kg)46%
18 weeks35 lb (16.1 kg)51%
20 weeks38 lb (17.3 kg)55%
24 weeks43 lb (19.5 kg)61%
28 weeks47 lb (21.3 kg)67%
32 weeks50 lb (22.8 kg)72%
36 weeks53 lb (24.2 kg)76%
40 weeks56 lb (25.5 kg)80%
44 weeks59 lb (26.6 kg)84%
48 weeks61 lb (27.6 kg)87%
52 weeks63 lb (28.5 kg)90%

One oddity worth naming rather than hiding: for the smallest breeds the published equation crosses 100% before the end of the year. That is the equation saying a small dog has finished growing well before its first birthday — we show what it publishes rather than trimming the last rows to look tidier. Large breeds do the opposite and are still filling out at one year.

Why this chart is an average and not a centile chart

Because a second body of work publishes centiles, and it publishes them as pictures. Salt et al. (2017) built growth centile charts from the records of more than 6 million young dogs, covering 12 weeks to 2 years of age. Their most useful finding is that growth follows a dog’s size category rather than its breed: 5 categories were enough, and for 20 of the 24 breeds they checked individually, the breed curve and its category curve agreed well. FEDIAF’s table is banded the same way — by adult weight, in 5 bands — which is two independent documents landing on the same idea.

We don’t reprint the Salt centiles, and that is deliberate: that study publishes its curves as charts to plot a puppy on, not as a table of weights, so restating them would mean reading numbers off a printed curve. Two further limits its authors state plainly — their standards stop at an adult weight of 40 kg and begin at 12 weeks. Both papers are listed under Sources below.

Common questions

How big will my puppy get?

The surest guide is the breed. Pick it above to see the adult weight range published for that breed — 181 breeds are covered, 60 from Wikidata’s open (CC0) data and 121 from the American Kennel Club’s official standard, with the source named on each breed’s page. A puppy usually lands inside its breed’s range, not at one end of it.

When do puppies stop growing?

It depends on size: larger breeds keep growing for longer than small ones (Hawthorne et al., 2004). Published growth standards cover 12 weeks to 2 years of age (Salt et al., 2017), so most of the growing happens inside that span.

Is there a puppy growth chart I can plot my puppy on?

Yes — the chart above shows it, week by week, for the breed you pick. It comes from the growth curves FEDIAF publishes (Nutritional Guidelines 2025), which run from 8 weeks to one year and are banded by expected adult weight rather than by breed. Read it as an average: FEDIAF states that growth patterns show individual variability, and it publishes one curve per size band, not centiles. The centile charts you may have seen elsewhere come from Salt et al. (2017), who published them as charts to plot a puppy on rather than as a table of weights — we don't restate those, because reading numbers off a printed curve would mean publishing figures no source states.

What should my puppy weigh at 8 weeks?

It depends almost entirely on how big the breed gets. At 8 weeks, FEDIAF's curves put a small breed at about a third of its adult weight and a giant breed at under a sixth of its own — which is why one number for "a puppy" would be meaningless. Pick your breed above and read the 8-week row of the chart. If your puppy sits off that row, the direction of travel across several weighings matters more than any single week.

Why doesn’t this ask my puppy’s current weight and age?

Because a single weigh-in predicts adult size poorly, while the breed range is measured across many adult dogs. Formulas that multiply a puppy’s weight at a given week exist, but we found no published dataset behind them that we could re-check — so we don’t use one.

What if I don’t know the breed?

For a mixed breed, expect an adult size between the parent breeds; look up each and read the two ranges together. If the parentage is unknown, a vet’s estimate from paw, frame and current growth will beat any calculator.

Adult weight, breed by breed

Every one of the 181 breeds has its own page: adult weight in pounds and kilograms, size class, a week-by-week growth chart, and the document the number came from.

Adult weight varies within every breed by sex, genetics and health, and mixed-breed dogs fall between their parents. Use this as a range, not a promise.

Verified on . Based on Wikidata — dog breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-22, CC0 license), Wikidata — cat breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-28, CC0 license), Body-Weight Changes during Growth in Puppies of Different Breeds (Hawthorne et al., Journal of Nutrition, 2004, vol. 134, p. 2027S), Growth standard charts for monitoring bodyweight in dogs of different sizes (Salt et al., PLoS ONE, 2017, vol. 12, no. 9, e0182064 (correction 2024: data availability only)) and Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs (FEDIAF (European Pet Food Industry Federation), 2025 edition (growth curves Table VII-8a, growth energy VII-8b and VII-10)). See the method.