Puppy Weight Calculator

This calculator predicts your puppy's adult weight from its age in months, its current weight and its expected breed size. It also shows how much of its growth is already done, how much weight is still to come, roughly when it will be fully grown, a likely adult range of ±15%, and a month-by-month chart you can compare with your own weigh-ins.

The prediction works best for purebred puppies whose size band is known, weighed between about 3 and 6 months, when growth is fast and steady. For mixed breeds, use the size band of the larger parent if you know it, or treat the result as a rough guide and repeat it every month. Paws, parents' weights and a vet's assessment are all useful cross-checks.

A puppy's weight also depends on how it is fed. Overfeeding does not make a dog bigger in frame; it makes it heavier and, in large breeds, raises the risk of joint problems. Use the dog food calculator to set portions and the dog age calculator to see how your dog's age translates as it grows.

The growth curve is a smooth approximation of the size-based puppy growth patterns described in veterinary nutrition texts, where small breeds reach adult weight in under a year and giant breeds take up to two. Individual puppies can be 15% or more either side of the prediction. The curve flattens at about 93% at the finishing age, so for dogs older than the finishing age the calculator slightly overstates adult weight; by then, current weight is the better answer. It also cannot predict weight for underweight or overweight puppies, since it assumes healthy body condition.

These are the growth fractions the calculator uses. To estimate adult weight by hand, divide your puppy's weight by the percentage for its age and size (for example 8 kg ÷ 0.62 = about 13 kg). To track progress the other way, the percentage calculator shows what share of a target weight your puppy has reached.

Bands are set by expected adult weight:

• Toy (under 5 kg / 11 lb): Chihuahua, Yorkshire terrier, Pomeranian.
• Small (5–11 kg / 11–24 lb): Jack Russell, Shih Tzu, Miniature Schnauzer.
• Medium (11–25 kg / 24–55 lb): Border Collie, Cocker Spaniel, Staffordshire Bull Terrier.
• Large (25–45 kg / 55–100 lb): Labrador, Golden Retriever, German Shepherd.
• Giant (45 kg+ / 100 lb+): Great Dane, Mastiff, Newfoundland, Saint Bernard.

If a breed sits near a boundary, or males and females differ a lot, run both bands and treat the true answer as somewhere between. Weights in pounds can be divided by 2.2 to enter kilograms.

Weigh at the same time of day every two to four weeks and plot the results against the calculator's chart. Steady weight gain that follows the curve is a good sign; sudden jumps or plateaus are worth a vet check. Body condition matters as much as the number: you should be able to feel the ribs easily under a thin layer of fat and see a waist from above. A puppy that gets heavier without gaining height is usually being overfed. Neutering age, especially for large breeds, can also affect final size, so discuss timing with your vet.