Pets Calculators Free Dog & Cat Calculators
Vet-sourced tools for everyday pet questions and urgent ones: is this food toxic, when are the puppies due, how big will my puppy get, and how much should I feed? Pick a calculator, enter your pet’s weight and get a clear answer in seconds.
Curated by Manzoor Ahmad, pharmacist · Updated October 18, 2026
Pet ate something toxic? Use a toxicity tool below, then call right away:
ASPCA (888) 426-4435 Pet Poison Helpline (855) 764-7661Most popular pet calculators
Toxicity & Poison Safety
Check how dangerous a food or medicine is for your pet's weight, and know when to call the vet.
Pregnancy & Breeding
Due dates, heat cycles and litter planning for breeders and first-time owners.
Weight & Growth
Predict adult size, track growth and find a healthy target weight.
Food & Nutrition
Daily calories, portion sizes and raw feeding for dogs, puppies and cats.
Age & Life Stage
Convert pet years to human years and plan care for every life stage.
Care, Costs & Gear
Budget for ownership and choose the right crate, tank or setup.
No calculators match that search yet. Try “dog”, “cat”, “food” or “toxic”, or browse all dexocalc calculators.
What is a pet calculator?
A pet calculator turns your dog’s or cat’s details, usually body weight and age, into a specific, actionable answer: a toxicity risk level, a whelping due date, a predicted adult weight, a daily calorie target or an age in human years. The dexocalc Pets Calculators use published veterinary formulas and cite sources such as the Merck Veterinary Manual, so you can see exactly how every number is worked out.
Which pet calculator do you need?
| Your question | Best calculator | What you’ll get |
|---|---|---|
| “My dog ate chocolate” | Dog Chocolate Toxicity Calculator | Theobromine mg/kg, risk level and when to call the vet |
| “My dog ate grapes or raisins” | Dog Grape Toxicity Calculator | Comparison with Merck warning levels plus a 72-hour kidney timeline |
| “When are the puppies due?” | Dog Pregnancy Calculator | Due date, whelping window and vet milestone calendar |
| “How big will my puppy get?” | Puppy Weight Calculator | Estimated adult weight and growth curve |
| “How old is my dog in human years?” | Dog Age Calculator | Human-year age by size and life stage |
Why pet owners trust dexocalc calculators
Veterinary sources, shown
Every tool cites its references, from the Merck Veterinary Manual to peer-reviewed canine studies, and explains the formula in plain English.
Built by a pharmacist
Dosing and toxicity are core pharmacy skills. The doses, thresholds and safety warnings are checked with the same care as human medicine content.
Honest about limits
Our toxicity tools never call a dose “safe” when the science can’t promise it, and every result points you to a vet when it matters.
Fast on any phone
Emergencies happen away from a desk. Every calculator is mobile-first, loads quickly and works without an account.
Private by design
Calculations run in your browser. Your pet’s details are never stored or sent anywhere.
Connected tools
Each calculator links to the next one you’re likely to need, like grape toxicity to chocolate toxicity, or pregnancy to puppy weight.
Pets Calculators FAQs
Pet calculators are free online tools that turn your pet's weight, age or other details into a practical answer, such as a due date, a safe food portion, a toxicity risk level or an age in human years. Every dexocalc pet calculator shows its formula and the veterinary sources behind it.
Yes. Every calculator in the Pets Calculators hub is free, needs no sign-up and runs in your browser. Nothing you type is saved or sent anywhere.
No. The calculators help you understand a situation and act faster, especially in emergencies like chocolate or grape poisoning, but only a veterinarian can examine your pet, diagnose problems and prescribe treatment.
Use the matching toxicity calculator, such as chocolate or grapes, to see the risk level for your dog's weight, then call your vet, the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661 right away. Don't wait for symptoms.
They are as accurate as the published veterinary data behind them. Formulas such as RER for calories, LH-surge timing for pregnancy and mg/kg toxic doses are well established, but individual pets vary, so treat results as informed estimates.
The calculators are researched and built by Manzoor Ahmad, a pharmacist with more than nine years of experience writing evidence-based health and supplement content and 13+ years of web development and SEO experience. Each tool cites sources such as the Merck Veterinary Manual and peer-reviewed research.
Yes. Cat calculators for age, pregnancy, calories and food portions are being added, along with an aquarium volume calculator.
Almost every pet calculation scales with body weight: calorie needs, medicine and supplement doses, and toxic thresholds. Use a recent weight from a scale or your vet for the most reliable results.
Manzoor Ahmad
Pharmacist & health writer · 13+ years of web development and SEO experience
Manzoor is a pharmacist who has spent more than nine years writing evidence-based health and supplement content. He builds every dexocalc pet calculator from primary veterinary references, with special care on toxicity and dosing tools where accuracy matters most. The calculators support pet owners. They don’t replace hands-on care from a veterinarian.
Disclaimer: The Pets Calculators provide educational estimates based on published veterinary data. Individual animals vary. Always consult a licensed veterinarian for diagnosis and treatment, and contact your vet or a pet poison control center immediately if your pet may have eaten something toxic.