Small Pet Calculators
Hamsters, guinea pigs and other small pet calculators — age, cage size and enclosure planning.
- Hamster Age CalculatorConvert hamster age to human years for Syrian, Dwarf (Campbell/Winter White), Roborovski and Chinese hamsters — big lifespan differences.ageOpen
- Guinea Pig Cage CalculatorCalculate the minimum, preferred and ideal cage size for 1–4 guinea pigs. C&C grid count, gender-adjusted recommendations.cageOpen
- Hamster Cage Size CalculatorCalculate minimum hamster cage size by species. Syrian: 100×50 cm (600 sq in) minimum per German TVT. Most pet-store cages are too small.housingOpen
- Gerbil Cage Size CalculatorCalculate correct cage size for gerbil pairs and groups. 10+ gallons floor space per gerbil with 6+ inches deep bedding for burrowing.housingOpen
About small pets in the United States
Hamsters, guinea pigs and gerbils are classic 'small pet' starter species — but their care requirements have been substantially revised in the last decade. German TVT and RSPCA UK now recommend enclosures much larger than US pet-store offerings, deeper bedding, and larger wheels than traditionally sold.
Why pet-store cages are usually too small
Most commercially marketed 'hamster cages' are 1,200–2,500 cm² — less than half the German TVT minimum of 5,000 cm². Guinea pigs, gerbils and hamsters all benefit significantly from larger enclosures: less stereotypic behavior, less aggression, better mental health.
Small Pets calculator FAQ
Which small pets are best for kids?
Guinea pigs — handle well, vocal, less prone to biting than hamsters, and live 5–8 years. Hamsters bite more often and are nocturnal (awake when kids are asleep).
Can I house different small pets together?
No. Hamsters are solitary (Syrians especially — fight to the death). Guinea pigs and rabbits should not cohabit (different diets, rabbits can injure pigs). Stick to same-species groups.
How accurate are these calculator results?
Our calculators implement the exact formulas used in veterinary textbooks, AAFCO/NRC nutrition standards, AAHA/AAFP life-stage guidelines, and peer-reviewed research. Results are accurate within the precision of the input data. For medical decisions (toxicity, drug dosing, diabetic insulin), always confirm with your veterinarian — calculators are educational tools, not clinical devices.