Built around the species
A dog’s age calculation is different from a rabbit’s life stage. Each tool uses an approach suited to the animal and the question.
Free pet calculators · Six species
Free Pet Calculators for
Age, Food & Weight
Free calculators for dogs, cats, horses, rabbits, hamsters and birds. Estimate pet age, feeding amounts and weight, or explore housing and daily care tools—with clear methods and practical limitations.
Free to useNo account neededMethods explained
Different pets. Different needs.One place to start.
Start with your pet
Pet calculators by species
Choose your companion to find calculators built around the way they live.
A useful first step
Understand your pet’s
age and life stage.
A kitten, a senior dog and an older rabbit need different kinds of care. Start with a simple age estimate to understand their stage of life.
- Choose from six pet species
- See the method behind the estimate
- Explore more detail in the full calculator
An educational starting point, not a diagnosis. Your pet’s individual health and your veterinarian’s advice come first.
Pet Age Calculator
Choose your pet and enter their age to see a life-stage estimate and practical care context.
Age
How this estimate is calculated
Life stages follow the 2021 AAHA/AAFP feline guidelines, RWAF size bands for rabbits, the RVC pet hamster study, AAV geriatric ages for birds, and standard equine stages. The dog figure uses the UC San Diego epigenetic formula. These are estimates for planning care, not a diagnosis.
Get straight to it
Popular pet calculators
Jump into an age, feeding, weight or habitat calculator.
Dog age calculatorCompare dog years with human years.Cat food calculatorFind a daily calorie starting point.Dog food calculatorEstimate energy needs and food portions.Horse weight calculatorEstimate weight from body measurements.Rabbit food calculatorPlan a species-appropriate feeding routine.Hamster cage size calculatorCheck the space in your hamster’s habitat.
Clarity behind the numbers
Useful estimates.
Honest explanations.
Pet care rarely comes down to one perfect number. We explain how each result is calculated, where the method comes from and what it can—and cannot—tell you.
Get to know MyPetCalculatorThe method is part of the answer
Tools identify published guidance, research or clearly labelled assumptions, so you can understand the result.
Care comes before a calculation
Results support everyday planning. Symptoms, health concerns and treatment decisions belong with a qualified veterinarian.
Before you begin
Pet calculator questions, answered
Know what to expect from your result.
Are the calculators free?
Yes. The calculators are free to use, and you do not need to create an account to get a result.
Can one age formula work for every pet?
No. Different species grow and age differently. Where a useful human-age comparison exists, the tool explains it. Other calculators focus on chronological age, life stage and care context.
How should I use a feeding or weight estimate?
Use it as a starting point alongside your pet’s body condition, weight trend, food label and any veterinary guidance. Individual needs can vary, so a calculator should not be the only basis for changing a care plan.
Do these tools replace veterinary advice?
No. These tools are for education and everyday planning. If your pet has symptoms, unexpected weight changes or other health concerns, contact a qualified veterinarian.
Find a useful next step for your pet.
Age, nutrition, weight and everyday care—all in one collection.