Free dog & cat health calculators
Free, instant pet health calculators: chocolate and poison checks, dog and cat age in human years, ideal weight, medication doses and pregnancy due dates.
Poison & Safety
Dog Chocolate Toxicity Calculator
Your dog ate chocolate? Enter weight, chocolate type and amount for an instant risk level and what to do now.
Open tool →Cat Chocolate Toxicity Calculator
Cat ate chocolate? Get the theobromine dose, risk level and clear next steps — built for cats, not just dogs.
Open tool →Dog Grape & Raisin Toxicity
Grapes and raisins can cause kidney failure at any amount — check your dog's risk now.
Open tool →Dog Xylitol Toxicity
Gum, peanut butter and sugar-free sweets — xylitol is fast and dangerous. Check the dose.
Open tool →Dog Onion & Garlic Toxicity
Onion, garlic, leek and chive amounts that put your dog at risk.
Open tool →Dog Caffeine Toxicity
Coffee, tea, energy drinks or caffeine pills — get the dose and risk level fast.
Open tool →Dog Ibuprofen Toxicity
Ate Advil or Motrin? Check the mg/kg dose and the stomach- and kidney-risk level.
Open tool →Acetaminophen / Tylenol Toxicity
Tylenol dose & risk for dogs and cats — cats are in danger at any amount.
Open tool →Dog Macadamia Nut Toxicity
How many macadamia nuts is too many? The dose behind the weak-back-legs syndrome.
Open tool →Dog Marijuana / THC Toxicity
Ate weed or an edible? Estimate the THC dose — and why edibles are extra dangerous.
Open tool →Dog Nicotine Toxicity
Cigarettes, vape e-liquid, gum or pouches — get the nicotine dose and risk now.
Open tool →Dog Alcohol Toxicity
Beer, wine, spirits, sanitizer or raw bread dough — get the ethanol dose and risk.
Open tool →Age & Life Stage
Dog Age Calculator
Convert your dog's age to human years using the modern size-adjusted formula — not the old “×7” myth.
Open tool →Cat Age Calculator
Convert your cat's age to human years and see their life stage, from kitten to senior.
Open tool →Dog Pregnancy Calculator
Enter the breeding date for your dog's whelping due date and a week-by-week pregnancy timeline.
Open tool →Cat Pregnancy Calculator
Enter the mating date for your cat's due date and a stage-by-stage pregnancy timeline.
Open tool →Dog Life Expectancy
Estimate your dog's lifespan from breed size and weight.
Open tool →Puppy Weight Predictor
Predict your puppy's adult weight from current age and weight.
Open tool →Dog Heat Cycle Calculator
When is she most fertile, and when's the next heat? Fertile window + next cycle by size.
Open tool →Weight & Hydration
Dog Ideal Weight Calculator
“Is my dog overweight?” Get an ideal-weight range and body condition read from a quick hands-on check.
Open tool →Dog Water Intake Calculator
How much water should your dog drink a day? Get the healthy range by weight — and the signs of too much or too little.
Open tool →Cat Ideal Weight Calculator
Is your cat overweight? Ideal-weight range and body condition score.
Open tool →Food & Calories
Dog Calorie Calculator
Daily calories your dog needs by weight, life stage and activity — with how that converts to cups of food.
Open tool →Cat Calorie Calculator
Daily calories your cat needs by weight and life stage.
Open tool →Dog Raw Feeding Calculator
How much raw food to feed — daily grams and ounces from the 2–3% of body weight rule.
Open tool →Medication Dosage
Dog Benadryl Dosage Calculator
The standard 1 mg/lb Benadryl dose by your dog's weight, in mg and in tablets/liquid — with vet cautions.
Open tool →Dog Melatonin Dosage
Weight-based melatonin dose for anxiety and sleep — with the must-know xylitol warning.
Open tool →Dog Famotidine (Pepcid) Dosage
Pepcid dose by weight (0.5 mg/kg) in mg and tablets — for stomach acid and upset.
Open tool →Dog Omeprazole (Prilosec) Dosage
Once-daily omeprazole dose by weight for ulcers and reflux — in mg and capsules.
Open tool →Built for worried pet parents
Instant. Every calculator runs in your browser — type and the answer updates live. No install, no account.
Vet-formula. Toxicity, dosing, calories and age use published veterinary formulas, explained in plain language, with the references listed on each page.
Private. Nothing you type about your pet ever leaves your device.
Not a substitute for your vet. These tools give fast estimates to help you decide what to do next. In an emergency, call your veterinarian or an animal poison control line right away.