Puppy Weight Calculator
Estimate a puppy’s adult weight from its current weight and age using the linear growth-rate method. Calculates in your browser.
Estimated adult weight
-
Show the math
A puppy's growth is roughly linear for the first year, so its adult weight can be projected from how fast it's growing now:
adult = current weight ÷ age in weeks × 52
This works best for estimates taken between about 8 and 26 weeks. Small breeds finish growing near 9–12 months; large and giant breeds keep filling out to 18–24 months, so this method under-reads for them late on.
Breed growth charts from your vet are more precise. Everything is calculated in your browser.
What this does
A puppy weight calculator estimates a puppy’s adult weight from its current weight and age using the linear growth-rate method.
How to use it
- Enter the current weight.
- Enter the age in weeks.
- Read the projected adult weight.
- Cross-check with a breed chart.
How it works
It projects the current growth rate to 52 weeks, working best between about 8 and 26 weeks. Large and giant breeds keep growing to 18–24 months, so it reads low for them late on.
adult ≈ current weight ÷ age in weeks × 52
Understanding your result
This projects the current growth rate out to adulthood, so it is most reliable between about 8 and 26 weeks. Large and giant breeds keep growing to 18 to 24 months, so the estimate reads low for them late on; for a firmer number, weigh again in a few weeks and compare the trend.
Example
A 10-week pup at 5 kg projects to about 26 kg grown.
Sources & methodology
Last updated .
Frequently asked questions
How does it estimate adult weight?
It projects the current growth rate to 52 weeks: adult ≈ current weight ÷ age in weeks × 52. This works best between about 8 and 26 weeks.
Is it accurate for large breeds?
Large and giant breeds keep growing to 18–24 months, so the estimate reads low for them late on. Breed growth charts from your vet are more precise.
Is anything stored?
No. Everything is calculated locally in your browser.
Related tools
Dog Age Calculator
Convert your dog’s age to human years using the size-based chart method, with the 2020 epigenetic clock for reference. Calculates in your browser.
Cat Age Calculator
Convert your cat’s age to human years with the standard feline chart and see its life stage. Calculates in your browser.
Pet Food Portion Calculator
Turn a daily calorie target into cups and grams of food per day and per meal, using the energy figures on the bag. Calculates in your browser.
Pet Calorie Calculator
Estimate a dog or cat’s daily calorie needs from body weight and life stage using the RER and MER veterinary formulas. Calculates in your browser.