Worried about your pet? Get a straight answer in 30 seconds.
32 free pet health calculators — ate something toxic, how much to feed, ideal weight, drinking too much, vaccination dates and more. Built and checked by an emergency veterinarian.
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- Answers in 30 seconds
Emergency: my pet ate something
If your pet is collapsed, struggling to breathe, having a seizure, bloated and unproductively retching, or bleeding heavily, stop reading and call your nearest emergency veterinary hospital now. These tools do not replace that call.
All 32 free pet health calculators
32 of 32 tools shown.
- Health checks
Anaesthetic Risk Estimator
Understand your pet's anaesthetic risk before surgery or a dental, and the questions worth asking your own vet beforehand.
Open tool - Medicines & parasites
Antihistamine Dose Calculator
Weight-based doses of single-ingredient antihistamines for dogs and cats, and why most allergy packets on the shelf must never be given.
Open tool - Health checks
Breed Genetic Disease Checker
Free breed health checker from an emergency vet. Pick your dog or cat breed (or cross) and see the inherited conditions it is prone to, what to watch for, which DNA and screening tests exist, and which signs are emergencies.
Open tool - Poisons & emergency
Chocolate Toxicity Calculator
Theobromine dose from the chocolate type, the amount eaten and your dog's weight. Signs start near 20 mg/kg and seizures near 60 mg/kg.
Open tool - Food & feeding
Daily Calorie Calculator
How many calories your dog or cat actually needs each day, from resting energy requirement adjusted for age, desexing and activity.
Open tool - Poisons & emergency
Emergency Symptom Checker
Answer a short set of questions and find out whether your pet needs a vet right now, later today, or can safely wait until morning.
Open tool - Health checks
A Vet's Fit-to-Fly Checker
This free, vet-built tool screens your animal for the things that actually make air travel dangerous.
Open tool - Poisons & emergency
General Toxins Calculator
Grapes, lilies, rat bait, snail bait, medications and dozens more common household poisons, checked against your pet's body weight.
Open tool - Food & feeding
Homemade Dog & Cat Food Calculator
Estimate the energy, protein and calcium a home-cooked diet needs to hit, and see where the recipes circulating online fall short.
Open tool - Life stage & planning
Human Years Calculator
A realistic dog and cat age conversion based on size and species, rather than the multiply-by-seven myth that has never been true.
Open tool - Poisons & emergency
Ibuprofen & Paracetamol Toxicity Calculator
Human painkillers are one of the most common serious pet poisonings, and cats have no safe dose of paracetamol at all. Check what was swallowed.
Open tool - Weight & body
Ideal Weight Calculator
Your pet's target weight from breed, frame and body condition, and how many kilos need to come off to get there safely.
Open tool - Poisons & emergency
Onion & Garlic Toxicity Calculator
Allium doses that matter, including the cooked and powdered forms owners miss. Cats are affected at far smaller amounts than dogs.
Open tool - Health checks
Pain Scale Calculator
Pets hide pain well. Score the behavioural signs vets grade in consult and find out whether yours is sore enough to need treating.
Open tool - Medicines & parasites
Parasite Treatment Finder
Give it your pet's species, age and what you need covered, including paralysis tick, and it finds the one product or minimal combination that does it.
Open tool - Life stage & planning
Perfect Pet Picker
Match your home, hours, budget and experience to the species and breeds that will actually suit you, from a vet who sees the mismatches.
Open tool - Weight & body
Pet BMI & Body Condition Calculator
Score your pet on the 9-point body condition chart vets use. Five out of nine is ideal, and each point above is roughly 10 percent overweight.
Open tool - Food & feeding
Pet Food Shopping List & Meal Prep Calculator
Turn a daily feeding amount into how much food to buy, how long a bag lasts and what your pet actually costs to feed each month.
Open tool - Food & feeding
Pet Food Transition Calculator
A day-by-day mixing schedule for switching your pet onto a new food without triggering diarrhoea.
Open tool - Money
Pet Insurance Comparison Calculator
Compare quotes side by side: premium, excess, reimbursement rate and annual limit — with break-even, typical-year, bad-year and multi-year totals.
Open tool - Medicines & parasites
Pet Supplement Dose Calculator
Doses and honest evidence ratings for 85 supplements, from fish oil and glucosamine through to the ones not worth your money.
Open tool - Life stage & planning
Post-Surgery Care Checklist
Build a personalised after-surgery recovery sheet for a dog or cat: medicines, rest, wound care, collar days, warning signs and a tick-off checklist owners can use on their phone.
Open tool - Life stage & planning
Pre-Surgical Checklist
Enter the admission time and this tool works out exactly when food and water stop, builds a morning medication plan and gives you a tick-off list for the night before and the morning of surgery.
Open tool - Life stage & planning
Pregnancy & Due Date Calculator
Work out gestation stage, the whelping or queening date and what to prepare when, from the mating dates you have.
Open tool - Food & feeding
Puppy & Kitten Feeding Calculator
Growth-stage feeding amounts for puppies and kittens that change as they grow, instead of one fixed number on the back of a bag.
Open tool - Health checks
Quality of Life Calculator
A structured, honest score for pain, mobility, appetite and joy in an ageing or unwell pet, for when you need something other than a gut feeling.
Open tool - Money
True Cost of Owning a Pet Calculator
Lifetime cost of a pet including food, prevention, insurance, grooming and the emergency vet bills nobody budgets for.
Open tool - Life stage & planning
Vaccination & Parasite Schedule Builder
A one-page printable vaccination and worming schedule for a single pet, for the fridge door or the clinic wall.
Open tool - Life stage & planning
Vaccination, Worming & Flea Calendar
Build a full first-year and lifelong C3, C5 and F3 prevention schedule from your pet's date of birth, then sync every due date to your phone.
Open tool - Health checks
Water Intake Calculator
Normal is roughly 50 to 60 mL per kilo a day. Above about 100 mL/kg is polydipsia, and that is a kidney and diabetes conversation.
Open tool - Life stage & planning
When to Desex Calculator
Free breed-specific desexing age calculator from an emergency vet. Enter breed, sex and date of birth to get the earliest sensible age and the ideal window to spay or neuter, with the joint, cancer and incontinence evidence behind it.
Open tool - Poisons & emergency
Xylitol Toxicity Calculator
About 0.1 g/kg can crash a dog's blood sugar and 0.5 g/kg risks liver injury. Covers gum, mints, peanut butter and baking.
Open tool
Are you a vet, nurse or student?
The clinical side lives on its own page: anaesthetic drug calculators, CRI, IV fluid rates, blood gas, electrolyte corrections, triage and staging scores. Free, no login.
Veterinary calculators
These tools answer one question. The app remembers the answers.
Weights, vaccinations, worming, medications, symptoms, photos and vet notes for every pet in your household, in one place. Plus certified vet chat when a calculator is not enough.
The app is free to download. Tracker connectivity, veterinary support and other premium features may require a paid plan. Check the app and product pages for current availability.
Three steps to a straight answer.
Search the worry, not the tool name
Type what is actually happening. “Chocolate”, “drinking a lot” or “how much food” will find the right calculator faster than scrolling will.
Use a real weight in kilograms
Almost every calculation starts with body weight, and a guess that is 20 percent out makes the answer 20 percent out. Weigh at the vet, or weigh yourself holding your pet and subtract.
Read the working, then the advice
Each tool shows the figure it applied and what to do next. If the result and your gut disagree, trust your gut and call a vet.
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