Free · formulas shown · metric & imperial
Pet calculators built on veterinary guidelines
How much to feed, how old your pet is in human years, when a litter is due — every answer shows its formula and the sources behind it.
- Formula shown on every page
- Sources cited
- No sign-up
- 74free calculators
- 100+automated formula tests
- 2unit systems
- 0sign-ups needed
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Browse by topic
Pick a topic, or jump straight to the calculator you need.
- 14 toolsDog NutritionFood, calories, raw feeding, treats
- Dog Calorie
- Dog Food
- Dog Food Calorie
- +11 more
- 5 toolsCat NutritionWet & dry portions, kittens
- Cat Food
- Kitten Food
- Cat Calorie
- +2 more
- 7 toolsAge & LifeHuman years and life stage
- Cat Age
- Dog Age
- Puppy & Kitten Age
- +4 more
- 6 toolsWeight & BodyBody condition, weight loss, ideal weight
- Dog Body Condition Score
- Dog Weight Loss
- Pet Weight Change
- +3 more
- 5 toolsBreedingDue dates, heat cycles
- Cat Pregnancy Due Date
- Dog Heat Cycle
- Dog Pregnancy Due Date
- +2 more
- 18 toolsCosts & BudgetWhat owning a pet really costs
- Cost of Owning a Dog
- Dog Food Cost
- Cost of Owning a Cat
- +15 more
- 3 toolsSize & GearCrate and harness sizing
- Dog Crate Size
- Dog Harness Size
- Pet Measurement Converter
- 2 toolsDog HealthDaily water needs and more
- Dog Water Intake
- Pet Vaccination Due Date
- 9 toolsAquaticsTank volume and water changes
- Aquarium Volume
- Aquarium Water Change
- Aquarium Water Weight
- +6 more
- 5 toolsHorses & LivestockEstimate a horse's weight
- Horse Weight
- Horse Hay Cost
- Horse Maintenance Nutrients
- +2 more
Our promise
How we check our maths
Every formula comes from a primary source, is tested against independent calculations and shows its references. Health tools are only indexed after a licensed vet signs them off.
- 1Primary sources
Formulas come straight from the references vets use.
NRC 2006WSAVAMerck Vet ManualAAHA - 2Automated tests
Every result is checked against independent calculations before each release.
- 3Vet review
Each tool is marked as reviewed only after a licensed veterinarian signs it off, then re-reviewed every six months. Every page shows its last review date.