Every year of their life, made easier to understand.

Enter your dog's date of birth and adult size. The result combines exact calendar age with a size-aware comparison, because a Chihuahua and a Great Dane do not move through later life at the same rate.

Enter your cat's date of birth to see exact calendar age and the recognised non-linear human-age comparison. The first two feline years account for far more development than each later year.

Rabbit ageing is better understood through exact age and life stage than a made-up human-years multiplier. Enter a date of birth to see both, plus the next birthday.

Enter the date of birth and choose the closest equine type. The calculator keeps exact chronological age distinct from the much looser idea of a human-age equivalent.

Guinea pigs change quickly in their first year. Enter a date of birth to see exact age, a practical life-stage estimate and progress through a typical companion lifespan.

A few hamster months represent a large part of a typical lifespan. Enter a date of birth for an exact calendar result and a clear life-stage estimate.

Ferrets reach full size within months and adulthood at about one year. Enter a date of birth to place that rapid development on a clear calendar timeline.

Pet rats move through life quickly. Enter a date of birth for an exact age and the RSPCA's approximate month-based human-age comparison.

Parrot is a broad family, so species group matters. Choose the closest group and enter the date of birth for an exact age and a more honest lifespan comparison.

Budgies are parrots, but their typical lifespan is much shorter than a macaw's or African grey's. This dedicated calculator uses the budgie-specific range.

Tortoise lifespans vary enormously. Choose the closest broad type and enter the date of birth to see an exact age without pretending there is one universal tortoise clock.

Enter your bearded dragon's hatch date or best-known birthday. The result shows exact calendar age and lifespan context without using a generic reptile multiplier.