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Growth & weight · Puppies

Puppy Growth Calculator

Keep a record of your puppy's weight, see the trend week by week, and explore how different growth assumptions change an adult-weight estimate.

By DogAge · Updated October 13, 2026 · Sources below

Puppy weight & growth planner

Record real weigh-ins, then explore an adult-weight scenario. Age alone cannot tell us what fraction of adult size your puppy has reached.

These are scenarios you choose, not age-based or breed-based predictions. Ask your vet which assumption, if any, fits your puppy.

Your puppy growth chart

Add a weigh-in at the age above. Entries at the same age replace each other. This tab's entries disappear when you reload.

No measurements yet. Add two or more to see the growth trend.

Inputs stay in this browser tab. No account needed.

Puppy weight calculator: an estimate with visible assumptions

There is no universal age-to-weight multiplier for every puppy. A small dog and a giant dog can be at different points in their growth at the same age. Mixed-breed ancestry adds more uncertainty.

This tool deliberately separates observation from assumption. The age and current weight describe your puppy today. The assumed fraction describes a scenario you choose; it is not inferred from those measurements.

Scenario adult weight = current weight ÷ assumed fraction

Example: a 20 lb puppy at an assumed 50% of adult weight gives 20 ÷ 0.5 = 40 lb. At 75%, the same puppy gives about 26.7 lb. Neither scenario proves which adult weight the puppy will reach.

If you do not have a reason to choose a fraction, use the measurement chart without calculating a scenario. A veterinarian can interpret the trend alongside ancestry, nutrition, physical examination and an appropriate reference chart.

Puppy growth chart: plot actual weigh-ins

  1. Use the same scale and a consistent weighing routine when possible.
  2. Enter age in weeks and weight, then select “Add weigh-in.” Repeat for previous measurements.
  3. Review the chart and table. A second entry at the same age replaces the first, so you can correct a measurement.
  4. Share important changes with your veterinarian. Refreshing or closing the page clears the entries, so keep a separate record if you need them later.

The line joins the measurements you supply. It does not predict future points, show a healthy percentile band or tell you to increase or reduce food. A falling line deserves context, particularly if your puppy seems unwell.

Growth, human-year age and ideal weight are different questions

Human-year age compares life stages. Growth tracks changes in physical size. Body condition asks about fat stores and muscle. One number cannot stand in for all three.

For a month-by-month age comparison, use the puppy age calculator. For an adult dog with a vet-set weight target, use the dog weight calculator.

Puppy Growth Calculator FAQ

How big will my puppy get?

Adult size depends on genetics, breed or breed mix, sex and individual development. Parent weights and veterinary growth assessments can inform an estimate. A single weight and age cannot establish an accurate adult-weight forecast.

What does the puppy weight calculator assume?

You choose a hypothetical fraction of adult weight: 25%, 50% or 75%. The tool divides current weight by that fraction. It does not automatically assign a fraction based on age, and the answer is not a validated biological prediction.

Is this puppy growth chart a normal growth chart?

No. It plots the measurements you enter, not population percentiles or a breed-specific reference curve. It can help you describe a trend to your veterinarian but cannot diagnose normal or abnormal growth.

Can I change the chart from pounds to kilograms?

Yes. Changing the unit converts the input and recorded weights, rather than treating the same number as a different unit. Chart entries last only for this open page session.

What if my puppy stops gaining weight?

Growth varies, but poor appetite, weight loss, vomiting, diarrhea or a sudden change in the trend should be discussed with your veterinarian. Do not use an adult-weight scenario to decide how much to feed.

Sources & model notes

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