Height, length and weight of an adult Jack

Mass, length and height of an adult Jack from the measurements of its kitten: growth calculator

Growth depends on nutrition, health and heredity, so we show a range rather than a single number. For a Jack it is built from the known sizes at every life stage, from birth to adulthood.

Growth calculator: how big will the young animal grow

How it works

We know how animals grow: for every species and many breeds we know the average weight and size of a young animal at different ages, from birth to adulthood. Give the age, sex and at least one measurement of the youngster (weight, length, height at the withers or length with the tail) and we will show how big it will most likely grow. This is a range, not an exact number: growth depends on nutrition, health and heredity. The more measurements, the narrower the range.

For now we calculate only for mammals with the necessary data: at present cats and dogs, including many breeds.

An extended version is coming soon. It will take measurements at several ages at once, pull the weight and height from the pet diary and refine the forecast by the sizes of the parents and grandparents.

How big will my Jack kitten grow?

It depends on age, sex, heredity and nutrition. The calculator shows the range of mass, length and height at the withers for a Jack from the measurements of the kitten, not an exact number.

How much will a Jack weigh as an adult?

The mass depends on sex and line, so we give a range. Enter the weight of the kitten and its age, and the calculator refines the expected adult mass.

When does a Jack stop growing?

The main growth ends by a certain age and after that the size hardly changes. For a Jack this age depends on sex and line; the calculator shows what share of the adult size the kitten has already reached.

How accurate is the growth forecast?

It is a guide, not a promise: growth depends on nutrition, health and heredity. The more measurements you enter, the narrower the range.