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Dog Weight Growth Calculator

Work out dog weight growth instantly with clear inputs, formula shown and shareable results.

About Dog Weight Growth Calculator

Puppy growth follows a decelerating curve, modelled here as age over maturity age raised to the power 0.55, so dividing current weight by that fraction projects the adult weight. Giant breeds grow for twice as long as small ones, which is why the same 8 kg at 16 weeks means a very different adult dog depending on breed.

Formulas

Growth fraction

fraction of adult weight = (age in weeks / maturity weeks) ^ 0.55

Adult weight

adult weight = current weight / growth fraction

Worked example

With the default values below, Dog Weight Growth Calculator returns Projected adult weight of 16.55. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current weightminimum 0.1 kg
8 kg
Current ageaccepts 1–104 weeks
16 weeks
Expected breed sizeone of Small (mature about 12 months), Medium (mature about 14 months), Large (mature about 18 months), Giant (mature about 24 months)
Medium (mature about 14 months)

Results

Projected adult weight
16.55 kg
Share of adult weight reached
48.3%
Weeks until skeletal maturity
44
Weight still to gain
8.55 kg

Step by step

  1. 1Values used
  2. 2Growth fraction
  3. 3Adult weight
  4. 4Projected adult weight= 16.55 kg
  5. 5Share of adult weight reached= 48.3
  6. 6Weeks until skeletal maturity= 44
  7. 7Weight still to gain= 8.55 kg

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Dog Weight Growth figure worked out?

fraction of adult weight = (age in weeks / maturity weeks) ^ 0.55. Puppy growth follows a decelerating curve, modelled here as age over maturity age raised to the power 0.55, so dividing current weight by that fraction projects the adult weight.

Why does this matter?

Giant breeds grow for twice as long as small ones, which is why the same 8 kg at 16 weeks means a very different adult dog depending on breed.

What do I need to enter?

Enter current weight, current age, expected breed size. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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