Pet Calculators
Aquarium Volume Calculator
Calculate an aquarium's exact water volume in gallons or liters from length, width, and height, for accurate stocking, filtration, and medication dosing.
Bird Cage Size Calculator
Find the minimum recommended enclosure size for a pet bird by species group, cross-checked against wingspan for full wing extension room.
Cat Food Calculator
Calculate a cat's daily food ration in cups and calories from weight and life stage, using cat-specific veterinary energy-requirement multipliers.
Dog Food Calculator
Calculate a dog's daily food ration in cups and calories from weight, life stage, and activity level using standard veterinary energy-requirement formulas.
Dog Walking Calorie Calculator
Estimate the calories a dog burns on a walk from body weight, walk duration, and pace, using distance and pace-specific intensity factors.
Fish Stocking Calculator
Estimate safe fish stocking capacity for a tank using the classic inch-per-gallon guideline, based on tank volume and average adult fish length.
Pet Age Calculator
Convert a dog or cat's age into human-equivalent years using the size-adjusted veterinary aging formula, not the outdated multiply-by-seven rule of thumb.
Pet Food Calculator
Calculate a dog or cat's daily food ration in cups using resting energy requirement, life-stage activity factor, and your specific food's calories per cup.
Pet Insurance Cost Calculator
Estimate monthly and annual pet insurance premiums from species, age, breed risk tier, coverage level, deductible, and reimbursement percentage.
Reptile Tank Heating Calculator
Size an under-tank heat mat or overhead basking bulb for a reptile enclosure based on tank volume and the target basking-spot temperature.
Care Numbers That Change By Species and Size
Pet care math varies enormously by species and size in ways that make generic advice unreliable — a dog's food portion scales very differently than a cat's, an aquarium's safe fish stocking depends on tank volume and filtration far more than fish count alone, and pet age conversion is more nuanced than the old "multiply by seven" rule most people know. Ten calculators here cover feeding, housing, and cost planning across common pets.
Popular Pet Calculators
Ten tools span feeding, habitat sizing, and cost:
- Dog Food Calculator — estimates daily food portions based on weight, breed size, and activity level.
- Cat Food Calculator — estimates daily calorie and portion needs based on cat weight and life stage.
- Pet Age Calculator — converts a pet's age into human-equivalent years using species and size-adjusted formulas.
- Fish Stocking Calculator — estimates safe fish population for an aquarium based on volume and filtration capacity.
- Pet Insurance Cost Calculator — estimates premium cost based on species, age, breed, and coverage level.
Why "One Dog Year Equals Seven Human Years" Is Outdated
The old seven-to-one rule doesn't hold up against how dogs actually age — a dog matures to adult-equivalent age far faster than seven years in its first year or two of life, then ages more slowly per year afterward, and larger breeds age faster in their later years than smaller breeds despite the same chronological age. Modern pet age calculators use nonlinear, breed-size-adjusted formulas (closer to actual veterinary aging research) rather than a single flat multiplier, which is why a large-breed dog and a small-breed dog of the same chronological age can show meaningfully different "human age" equivalents.
Frequently Asked Questions
Why does fish stocking depend on more than just tank volume?
Filtration capacity, fish species' waste production, adult fish size, and territorial behavior all affect safe stocking levels, which is why stocking guidelines go beyond a flat "one inch of fish per gallon" rule of thumb.
Does pet insurance cost increase significantly with age?
Yes, typically — premiums generally rise as pets age and become more likely to develop health issues, similar to how human health insurance costs often scale with age-related risk.
Explore More
Need clinical dosing information for a pet? See the Veterinary Calculators, or check home aquarium heating setup in the HVAC Calculators.