PetCalc
A free collection of pet calculators for dog and cat age, daily food portions, and chocolate toxicity risk.
PetCalc is a free collection of pet calculators that run right in your browser with no sign-up or install, instantly computing dog and cat age in human years, daily food portions, and chocolate toxicity risk.
All calculations run in your browser and your inputs are never sent to or stored on a server. Results are estimates for reference only — consult a veterinarian for an accurate diagnosis.
Pet calculators
Dog Age Calculator
Convert your dog's age to human years by breed size (small, medium, large).
Cat Age Calculator
Convert your cat's age to human years and see the life stage.
Pet Food Portion Calculator
Use weight and activity level to find RER/MER and the recommended daily food in grams.
Dog Chocolate Toxicity Calculator
Estimate theobromine intake and risk level from weight, chocolate type, and amount eaten.
Pet guides
Why use PetCalc
- Free, no install — Use it right in your browser with no sign-up or app to download.
- No data collected — Every calculation runs in your browser and your inputs are never sent to a server.
- Evidence-based formulas — Uses published sources such as AAHA breed-size age conversion, the RER/MER energy formulas, and theobromine toxicity thresholds.
- Veterinary disclaimer — Results are estimates for reference only; an accurate health assessment requires a veterinarian.
Each result is an estimate for reference only. Always consult a veterinarian about your pet's health, diet, and any emergency.
Last updated: 2026-06-25