Dog Size Calculator

Explore adult size. Track every stage of growth.

Puppy Measurements

Current age

Current weight

Expected size (adult)

Sex

Growth stage assumption

Editable assumption, not a measured maturity score.

Parents & shoulder height (optional)

Context for your veterinary discussion, not a genetic prediction. These values do not change the scenario arithmetic.

Mother’s weight kgFather’s weight kg

Current shoulder height (withers)

Assumption range & method

Adult scenario weight = current weight ÷ assumed completed fraction. The assumption is supplied by you; age and breed do not determine it automatically.

Variation around the assumption (%)

Scenario maturity age (weeks)

Size selections load a general illustrative endpoint: 52 weeks for small/medium, 78 for large, 104 for giant. These are not breed-specific guarantees. For mixed/unknown size, enter your own endpoint. Some dogs continue filling out beyond these ages.

Growth notes

Sex is recorded as context. No invented sex, parent, height or mixed-breed multiplier is applied. The curve is a display interpolation between the current measurement and scenario endpoint, not a fitted biological growth model.

Beagle puppy and adult size illustration, not a guaranteed appearance or scale

One measurement cannot determine final size.

Adult Size & Growth Outlook

ILLUSTRATIVE ADULT WEIGHT RANGE22–26 kg≈49–57 lbScenario estimate · not a clinical prediction.

12 kgCurrent weight

≈50%Of scenario target

≈12 monthsSize-stage guide

Based on the entered growth assumption. Range is not a confidence interval.

Your puppy’s growth trajectory

Example measurementsIllustrative projectionScenario range

Select a plotted point for details.

Illustrative scenario, not a WALTHAM centile chart.

Example past records are shown until you enter your own details.

Weight records

Use actual scale measurements. Ages and weights use the units selected on the left. Add replaces a record at the same age. Records are held in this tab until you explicitly save them on this device.

Age weeksWeight kg

Age	Weight	Record

From puppy to adult

Toy<5 kg

Small5–<10 kg

Medium10–<25 kg

Large25–45 kg

Giant>45 kg

Size groups are descriptive, not breed guarantees. Highlight follows the central scenario weight.

Understanding the estimate

The estimate uses current weight divided by the supplied growth fraction. You can adjust the growth stage assumption; parents and shoulder height are context, not a genetic guarantee.

About the chart and growth guides

The green line and band show a user-defined scenario, not a validated prediction, healthy-growth band or confidence interval. Only entered records are observations. Example records are labeled and removed when you start your own profile. Past weights are not fabricated from the curve.

To assess real growth, use the appropriate sex- and adult-size-specific WALTHAM chart with a veterinarian. This page does not reproduce WALTHAM centiles or classify a puppy’s growth as normal or abnormal.

Frequently asked questions

How accurate is a single measurement?

It cannot establish an accurate adult-weight prediction. Breed, age, genetics, body condition and health all matter. This calculator explores an explicit assumption and records weights for discussion with your veterinarian.

What if my puppy is a mixed breed?

Choose Mixed / Unknown and enter a scenario maturity age and growth-stage assumption. Parent information can help your veterinarian judge likely size, but no reliable universal multiplier is applied here.

Can shoulder height predict adult weight?

There is no universal conversion across dog breeds and body shapes. Shoulder height is recorded and exported as context; it does not change the estimated weight.