How big will my mutt puppy get? The Ultimate Guide

How much will my dog weight?

Our how big will my puppy get calculator uses the following equation:

Adult weight = (Puppy weight / Puppy age in weeks) × 52

Why 52?

52 is the number of weeks in a year. Thats how we program the dog size predictor to give us your puppys weight when he is exactly 1 year old.

We used this value in our puppy calculator because, on average, dogs mature into adults within 12 months. This value ranges from 8 months for smaller breeds to around 16 months for larger breeds.

Your dogs weight category

According to your puppy weight calculators results, we can place your dog into one of 5 major breed size groups:

Toy dog

< 12 lb / < 5.4 kg

Small dog

12 – 22 lb / 5.4 – 10 kg

Medium dog

22 – 57 lb / 10 – 25.9 kg

Large dog

57 – 99 lb / 25.9 – 44.9 kg

Giant dog

99 lb / >44.9 kg

Small dogs tend to live longer. For every increase of 4.4 pounds (2 kg) of body weight, a dogs lifespan decreases by 1 month. This way, the dog weight predictor serves as a tool for estimating your dogs longevity.

Once you got everything you need from the puppy size calculator, try our other Omni dog tools:

How big will my dog get in inches/centimeters?

Your dogs height depends mostly on its breed. However, you can estimate its maximum possible height from paws to shoulders using our dog weight chart calculator:

Toy dog

Max. 12 in (30.5 cm)

Small dog

Max. 18 in (45.7 cm)

Medium dog

Max. 25 in (63.5 cm)

Large dog

Max. 30 in (76.2 cm)

Giant dog

Max. 44 in (111.8 cm)

The tallest dog ever measured was a Great Dane of name Zeus. Zeus had an unbelievable 44 in (111.8 cm) of height! (from paw to shoulder)

What If You Don’t Know The Breed?

How big will my mixed-breed puppy get? Well, this is more complicated if you have a mixed breed or don’t know the breed makeup of your dog. In the latter case, you can always consider doing a dog DNA test to determine his breed makeup (you’ll want to do a DNA test ASAP since results can take a few weeks).

Also, if you adopt a puppy from a shelter, they may be able to give you some idea of the suspected breed makeup.

Can you tell how big a puppy will get?

To help determine your mutts adult size, know that at 10 weeks old a puppy is roughly 25% of its adult weight. At four months of age, he will be 50% of his adult weight and 75% at six months old. A dog’s height is also a good indicator of future size.