Petculator

Free pet calculators you can trust

Pet care, worked out.

Work out feeding amounts, age in human years, adult size, healthy weight and safety – with the maths shown, in plain English, and metric by default.

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DogCatRabbit & guinea pigHorseFish

Walk Check

Is it too hot to walk your dog today?

Weather comes from the free Open-Meteo service. Your location is only used to fetch the forecast and is stored on this device.

Open the full Walk Check

Surfaces used: Tarmac / asphalt, Concrete / paving, Artificial grass, Grass.

Most popular calculators

Dog age calculatorDog food calculatorPuppy weight calculatorCat age calculatorDog life expectancyCost of owning a dog (UK)Treat translatorWhich dog breed suits me?My pet ate something – toxicity checker

Dogs

Dog age calculatorYour dog's age in human years, adjusted for size.Dog food calculatorDaily calories and grams, including weight loss.Puppy weight calculatorEstimate how big your puppy will get.Dog ideal weight & body conditionScore your dog and find their ideal weight.Raw feeding calculator80/10/10 amounts for adults and puppies.Dog pregnancy due dateDue date, range and week-by-week timeline.Dog water intakeHow much your dog should drink each day.Dog exercise calculatorDaily minutes by breed, age and health.Puppy schedule plannerHour-by-hour routine, toilet breaks and meals.Dog life expectancyTypical lifespan by breed, and how to add healthy years.Cost of owning a dog (UK)First-year, yearly and lifetime costs you can edit.Which dog breed suits me?Match your home and lifestyle to breeds.

Cats

Cat age calculatorYour cat's age in human years.Cat food calculatorCalories, wet and dry split, treats.Cat ideal weight & body conditionNine-point score and ideal weight.Cat pregnancy due dateDue date, range and timeline.Cost of owning a cat (UK)What a cat really costs, year by year.

Rabbits & guinea pigs

Rabbit food calculatorHay, greens and pellets, plus age in human years.Hutch & run size checkerCheck your setup against RWAF and RSPCA guidance.Cost of owning a rabbit (UK)Set-up and running costs for a bonded pair.

Horses

Horse weight calculatorEstimate weight from girth and body length.Horse feed calculatorDaily and weekly forage in kilograms.Horse rug size calculatorUK rug size in feet and inches.Cost of keeping a horse (UK)Livery, farrier, feed and vet costs.

Fish

Aquarium volume calculatorLitres, heater wattage and filter flow.

All pets

Pet medication unit converterConvert a prescribed dose from mg to ml.Pet travel crate sizeMinimum crate size and nearest standard.UK pet travel plannerEU trip dates, certificate window and worming times.Vaccination, flea & worming plannerWhat's due next, with reminders and a health record.Treat translatorWhat that treat is worth in human food.Pet insurance claim simulatorSee what you'd pay and what the insurer pays.

Add your pet once, use it everywhere

Save your pet's details and every calculator fills itself in. Everything stays on this device.

Add your pet

Latest guides

How much should I feed my dog?A calm, calorie-based approach to working out how much to feed your dog, from puppyhood through to the senior years.How big will my puppy get?Understanding puppy growth curves, when different breeds finish growing, and how to spot the signs of healthy development.Is my dog overweight? Body condition scoring explainedHow to use hands-on body condition scoring to tell whether your dog is a healthy weight, and what to do if they are not.My dog ate chocolate: what to doWhat to do straight away if your dog has eaten chocolate, why it is dangerous, and how to prevent it happening again.Is it too hot to walk my dog?A practical guide to checking pavement heat, spotting heatstroke risk, and knowing when it really is too hot to walk your dog.Dogs in hot cars: the facts and what to doHow quickly cars heat up, why cracked windows and shade don't help, and exactly what to do if you see a dog in distress in a hot car.
See all 16 guides

Browse breeds

Adult weights, lifespans, feeding amounts and costs, with every calculator ready to go.

Dog breedsIncluding popular UK crosses like the Cockapoo and Cavapoo.Cat breedsFrom moggies to Maine Coons, with feeding and cost guides.

Why Petculator?

Science-based formulas

Published veterinary formulas, not rules of thumb.

Shows its working

Every result explains the maths and the numbers used.

Metric and UK-friendly

kg, grams and °C by default, with an imperial toggle.

More than just dogs

Cats, rabbits, guinea pigs, horses and fish too.

Free, no sign-up

No account, no email, no paywall.