Health & Fitness Tools

Puppy Growth Calculator

Track your puppy's growth rate and development timeline. View estimated weekly weight gain and remaining growth.

Formula Verified & Maintained by:Sarah Jenkins, MS, OTR/L

MS, OTR/L, Healthcare Systems Management • Clinical Operations Specialist & Productivity Lead

Peer-Reviewed AlgorithmAudited for 2026 Rules

Interactive Calculator

1. Provide Details

Current Weight (lbs)

lbs

Age (Weeks)

weeks

Breed Size Group

2. Output Results

Projected Adult Weight48.8 lbs

Average Weekly Weight Gain0.94 lbs/week

Remaining Weight to Gain33.8 lbs

How to Calculate: Formula & Steps

Computes average weekly weight gain to date and projects the remaining growth required to reach adult size.

Formula Used:Weekly Growth Rate = Current Weight ÷ Age (Weeks)

Step-by-Step Calculation Example

A 16-week puppy weighing 16 lbs has gained an average of 1 lb per week. It will gain approximately 32.7 lbs more to reach a 48.7 lb adult weight.

Common Mistakes to Avoid

Expecting constant linear weight gain, as growth rates typically slow down after 6 months.

Practical Use Cases

Monitoring healthy growth trajectories
Detecting growth spurts or stagnation

Expert Tips

A healthy puppy should have a visible waistline and ribs that are easily felt but not protruding.

Tracking Canine Growth Velocity & Development Stages

Monitoring a puppy’s weekly rate of weight gain helps pet owners and veterinarians ensure healthy skeletal development, prevent pediatric obesity, and choose the correct caloric portions for growth-stage puppy kibble.

Weekly Weight Gain Velocity

Weekly Gain = Current Weight (lbs) ÷ Current Age (Weeks)

For medium/large breeds, healthy puppies typically gain 1.5 to 2.5 lbs per week between weeks 8 and 20.

Growth Plate Closure Milestones

Puppy growth plates (epiphyseal plates) remain open during peak growth. Strenuous repetitive jumping or agility exercises should be avoided until growth plates fuse (12 months for medium, 18–24 months for large/giant breeds).

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.

Frequently Asked Questions About Puppy Growth Calculator

How much weight should a puppy gain per week?

Small breeds gain a few ounces per week, medium breeds gain 1-2 lbs per week, while large and giant breeds can gain 2-5 lbs weekly during peak growth.