Free calculator
Puppy Weight Calculator
How big will your puppy get? Enter their age, weight and breed size to estimate adult weight and see how far along your puppy is.
- Instant result
- No sign-up
- Free
Your result appears here
Fill in your puppy’s details and the answer updates instantly.
Estimated adult weight
0 kg
Likely range to
General information only, not veterinary advice. Always follow your own vet.
Step by step
How to use the Puppy Weight Calculator
- 1Pick your breed, or choose a size group.
- 2Enter your puppy’s age in weeks or months.
- 3Enter today’s weight in kg or lb.
- 4Read the estimated adult weight, the likely range and how far along your puppy is.
Why use it
Benefits
- Plan crates, beds and food before your puppy outgrows them
- Spot growth that looks unusually fast or slow
- Works for mixed breeds using size groups
- Easy range to share with your vet
How the puppy weight calculator works
Puppies of different sizes follow different growth curves. A toy breed gets most of the way to adult weight by about 6 months, while a giant breed can keep growing for up to two years. The calculator looks up the share of adult weight a typical puppy of your size group has reached at this age, then divides your puppy’s current weight by that share.
We show a likely range of about 10% either side, because genetics, diet and body condition all change the result. Mixed-breed puppies are hard to predict, so treat the estimate as a guide and recheck every few weeks.
Tips for tracking growth
- Weigh your puppy weekly at the same time of day and write it down on the Puppy Weight & Growth Tracker.
- Steady growth matters more than hitting a number. Sudden changes are worth a call to your vet.
- Large and giant breeds should grow slowly and steadily. Ask your vet about a suitable diet.
Free printables
Checklists that go with this tool
HealthPuppy Weight & Growth Tracker
Weigh your puppy weekly at the same time of day and write the number down. Share the chart with your vet.
Daily carePuppy Feeding Schedule Checklist
Puppies grow quickly and need regular meals. Typical schedules are below, but always follow the feeding guide on your food and your vet’s advice.
Before you bring puppy homePuppy Shopping List
It is easy to overspend on puppy gear. This shopping list separates the must-haves from the nice-to-haves so you can prioritise before the first trip to the pet store.
More free puppy tools
Puppy Feeding Calculator
Daily calories, grams and cups for your puppy, by weight and age.
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Dog Age Calculator
Convert your dog’s age to human years and see their life stage.
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Puppy Crate Size Calculator
Find the right crate size for your puppy’s adult size.
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Free date calculator
When is the next vet visit?
Enter your puppy's birthday or the day you brought them home and get a dated schedule of vaccines, vet visits and training milestones, ready to print.
Answers
Frequently asked questions
How can I predict how big my puppy will get?
Use their current weight and age with the typical growth curve for their size group. Knowing the parents’ adult weights is even better. The calculator gives a range, not a promise.
When do puppies stop growing?
Small and toy breeds are usually near adult size by 9 to 12 months. Medium breeds reach it by about 12 to 15 months, and large and giant breeds can keep filling out until 18 to 24 months.
Is my puppy underweight or overweight?
Weight alone cannot tell you. Check body condition: you should feel the ribs under a light covering of fat and see a waist from above. Ask your vet to confirm.
How accurate is a puppy weight calculator?
It is a reasonable estimate for purebred puppies and a rough one for mixed breeds. Expect the final weight to land within roughly 10 to 15% of the estimate.
Is the Puppy Weight Calculator free to use?
Yes. The Puppy Weight Calculator is completely free, needs no sign-up and works on phones, tablets and computers.
Can I rely on the Puppy Weight Calculator instead of my vet?
No. It gives a general starting point based on published guidance. Every puppy is different, so always follow your own vet’s advice.
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