Our puppy weight calculator gives pet owners worldwide a fast, breed-based estimate of adult dog size. Enter breed, current weight, and age to get an instant projection. It works like a dog size calculator, pairing a weight range with a size category — small, medium, large, or giant. Trusted by pet owners nationwide and around the world to help plan food, gear, and care ahead of time.
Fill in the details below. Takes about 30 seconds.
Estimate only — for feeding and care advice, please consult your veterinarian.
Choose your puppy's breed, or "mixed breed" if you're not sure.
Type in your puppy's latest weigh-in, in any unit.
This works out your puppy's exact age automatically.
Males and females of the same breed often grow differently.
Click "Calculate" to see your puppy's projected adult size.
Check your result against the growth chart below.
Realistic adult weight estimate in seconds.
Plan food and treat portions as your puppy grows.
Choose the right size crate, bed, and harness early.
Spot early signs of under- or over-feeding.
Budget for future veterinary and grooming costs.
Estimate mixed-breed adult size categories.
Track growth across multiple weigh-ins over time.
Have more informed chats with your veterinarian.
Average weight ranges by age and breed size category.
| Age | Toy | Small | Medium | Large | Giant |
|---|---|---|---|---|---|
| 8 weeks | 0.9–1.8 kg | 1.5–3 kg | 3–5 kg | 5–9 kg | 7–12 kg |
| 3 months | 1.4–3 kg | 3–5 kg | 5–9 kg | 9–15 kg | 12–20 kg |
| 4 months | 2–4 kg | 4–7 kg | 8–13 kg | 12–20 kg | 18–28 kg |
| 6 months | 2.5–5 kg | 5–9 kg | 10–18 kg | 18–30 kg | 28–40 kg |
| 9 months | 2.8–5.3 kg | 5.5–10 kg | 10.5–21 kg | 21–40 kg | 38–58 kg |
| 1 year | 3–5.5 kg | 6–11 kg | 11–23 kg | 23–45 kg | 45–70+ kg |
It's a close estimate based on breed averages and growth curves, not an exact prediction — genetics, diet and health all play a role.
Mainly breed and parent size. Small breeds reach 2–6 kg, medium 12–20 kg, large/giant 25–70+ kg.
Enter breed, current weight, and birth date above, then compare the result to the growth chart.
Yes — it's the biggest factor. Toy breeds mature faster and smaller; giant breeds grow for much longer.
Small/toy breeds by 9–12 months, medium by 12 months, large by 12–18 months, giant by 18–24 months.
“The breed estimate for our Labrador was spot on with what our vet later confirmed. Made buying the right size crate so much easier.”
“Simple and quick. I used it every few weeks to track our Cavapoo's growth against the chart and it always matched up well.”
“I walked into our first vet appointment already knowing roughly what to expect for his adult size. Made the whole conversation easier.”
“We weren't sure what our rescue mix would grow into. This gave us a realistic range to plan around instead of just guessing.”
“Free, no signup, and it just works. Bookmarked it and check back in every month or so as our puppy grows.”
“The growth chart alongside the calculator gave us real peace of mind that our puppy was developing normally.”
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