About PetCalc

PetCalc is a free collection of pet calculator tools for dog owners, cat owners, and aquarium hobbyists. We provide accurate, easy-to-use tools so you can make informed decisions about your pets' health and care — without needing to schedule a vet visit for every routine question about age, food portions, or tank size.

Our Tools

• Dog Calculators:
  • Dog Age Calculator — Convert your dog's age to human years using breed-size-adjusted formulas
  • Dog Food Calculator — Estimate daily calorie needs and food portions by weight and activity level
  • Dog Weight Chart — Check healthy weight ranges by breed
  • Dog Pregnancy Calculator — Track gestation milestones from mating date
  • Dog Body Condition Score (BCS) — Assess whether your dog is underweight, ideal, or overweight
• Cat Calculators:
  • Cat Age Calculator — Convert cat years to human years with life-stage awareness
  • Cat Food Calculator — Estimate daily calorie requirements for indoor and outdoor cats
  • Cat Weight Chart — Healthy weight ranges by breed and size
  • Cat Pregnancy Calculator — Gestation timeline from estimated conception date
  • Cat Lifespan Estimator — Estimate lifespan based on breed and lifestyle factors
• Aquarium Calculators:
  • Tank Volume Calculator — Calculate gallons or liters for rectangular, cylindrical, and bowfront tanks
  • Fish Stocking Calculator — Estimate how many fish your tank can support
  • Aquarium Heater Calculator — Find the right wattage heater for your tank size and temperature differential
  • Water Change Calculator — Calculate partial water change volumes for routine maintenance
  • Lighting Calculator — Estimate lighting intensity needs by plant type and tank depth

How the Tools Work

All PetCalc calculators run entirely in your browser using JavaScript. Your pet's data — age, weight, breed, tank dimensions — is processed locally on your device and never sent to any server. Results appear instantly, and the tools work offline after the initial page load.

Our Commitment

All calculators are based on published veterinary guidelines and established aquarium keeping standards. Results are for general reference only and should not replace advice from a licensed veterinarian or professional aquarist for medical concerns, special dietary needs, or unusual health situations.

Contact

Have questions or suggestions? Visit our contact page.