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Home/Best tools/Free Tools for Pet Owners

Best Free Pet Calculators & Tools

Look after your pets with quick, factual math. Estimate a dog age by breed size, work out calorie needs and food portions for dogs and cats, check chocolate toxicity risk, track a pregnancy, and size an aquarium. Informational tools, free and in your browser. All 20 tools below are free, run in your browser, and need no sign-up.

Dog Age by Breed Size CalculatorConvert dog years to human years with a size adjusted model instead of the naive times seven rule.Puppy Adult Weight PredictorEstimate how big your puppy will grow from its current age and weight using a simple growth ratio method.Dog Calorie Calculator (RER and MER)Work out daily calories for your dog from resting energy needs and an activity factor using the standard RER and MER method.Cat Calorie Calculator (RER and MER)Estimate daily calories for your cat from resting energy needs and a life stage factor using the RER and MER method.Dog Food Portion CalculatorTurn your dog daily calorie needs and the food calories per cup into a daily cup and gram feeding amount.Cat Food Portion CalculatorConvert your cat daily calorie needs and the food calories per can or cup into a clear daily feeding amount.Dog Water Intake CalculatorEstimate how much water your dog should drink per day from its body weight using a common ml per kg guideline.Dog Chocolate Toxicity CalculatorEstimate the theobromine dose from the chocolate type and amount your dog ate against common risk thresholds.Dog Pregnancy Due Date CalculatorEstimate your dog whelping due date and week by week timeline from the breeding date using a 63 day gestation.Cat Pregnancy Due Date CalculatorEstimate your cat queening due date and key milestones from the mating date using a 65 day feline gestation.Aquarium Volume CalculatorFind the water volume of a rectangular fish tank in litres and gallons from its length, width, and height.Fish Tank Stocking CalculatorEstimate how many fish a tank can hold with the classic inch per gallon guide and a safer adjusted figure.Horse Age to Human Years CalculatorConvert your horse age into human years with a staged model that reflects fast early growth and slower later aging.Rabbit Age to Human Years CalculatorConvert your rabbit age into human years with a staged model that reflects fast maturing youth and a long adult phase.Dog Crate Size CalculatorGet recommended crate length and height from your dog body measurements so it can stand, turn, and lie down.Cat Litter Usage CalculatorEstimate how much litter you use per month and the yearly cost from your number of cats and change routine.Dog Walking Distance CalculatorEstimate a daily walk distance and time target for your dog based on its energy level, age band, and body weight.Pet Sitting Cost CalculatorEstimate the total price of pet sitting or boarding from the daily rate, number of days, pets, and extra visits.Dog Body Condition Score EstimatorAnswer quick rib, waist, and belly questions to estimate a 1 to 9 body condition score and weight status.Pet Medication Dosing Schedule PlannerTurn a start time and dosing interval into a clear list of dose times across the next day or two.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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