Clear answers for everyday pet questions.
29 free calculators for dog and cat owners: age in human years, how much to feed, puppy size, crate size, due dates and more. Pounds or kilograms, every formula explained and sourced.
Most used
Dog Age Calculator
Dog years to human years by size, using the AAHA chart and the 2020 DNA formula.
Cat Age Calculator
Cat years to human years from the AAHA/AAFP chart, with the life stage.
Dog Food Calculator
How much to feed your dog a day in cups and grams, from calories and your food’s label.
Puppy Weight Calculator
Estimate how big your puppy will get from its weight now, age and expected size.
Dog Crate Size Calculator
What size crate your dog needs from two measurements, plus an IATA travel crate check.
Cat Food Calculator
How much wet and dry food to feed your cat a day, from calories and the label.
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Dog and cat years in human years, life stages and life expectancy.
Dog Age Calculator
Dog years to human years by size, using the AAHA chart and the 2020 DNA formula.
Cat Age Calculator
Cat years to human years from the AAHA/AAFP chart, with the life stage.
Dog Life Expectancy Calculator
Typical lifespan for 49 breeds and mixed breeds, from a 2024 study of 584,734 dogs.
How much to feed, calories, bland diets, pumpkin, fish oil and water.
Dog Food Calculator
How much to feed your dog a day in cups and grams, from calories and your food’s label.
Cat Food Calculator
How much wet and dry food to feed your cat a day, from calories and the label.
Puppy Food Calculator
How much to feed a puppy a day by age and weight, using the NRC growth formula.
Chicken and Rice Calculator
How much boiled chicken and rice to feed a dog with an upset stomach, by weight.
Pumpkin for Dogs Calculator
How much plain canned pumpkin to give a dog, checked against the 10% calorie rule.
Fish Oil for Dogs Calculator
EPA + DHA for your dog by weight: a starting amount, the vet maximum and capsules.
Dog Food Bag Calculator
How many cups are in a bag of dog food, how long it lasts and the cost per month.
Dog Calorie Calculator
Daily calories for your dog: RER and maintenance needs, plus a weight-loss target.
Dog Water Intake Calculator
How much water a dog should drink a day by weight, and when it is too much.
Cat Calorie Calculator
Daily calories for your cat: resting energy, maintenance needs and a weight-loss target.
Cat Water Intake Calculator
How much water a cat needs a day, how much its wet food already supplies, and when it is too much.
Puppy adult size, ideal dog and cat weight, and horse weight.
Puppy Weight Calculator
Estimate how big your puppy will get from its weight now, age and expected size.
Cat Weight Calculator
Find your cat’s ideal weight from its body condition score, and a safe weight-loss pace.
Horse Weight Calculator
Estimate a horse’s weight with a tape measure: heart girth and body length.
Dog Ideal Weight Calculator
Find your dog’s ideal weight from its body condition score, plus a safe weight-loss plan.
Dog and cat due dates and heat cycles.
Chocolate toxicity, the puppy vaccination schedule and medicine dose maths.
Dog Chocolate Toxicity Calculator
Dog ate chocolate? See the theobromine dose by weight, then call your vet now.
Puppy Vaccination Schedule
Your puppy’s shot dates from its birthday, following WSAVA and AAHA guidance.
Pet Medication Dose Calculator
Turn the mg-per-kg dose your vet prescribed into mg, tablets or ml for your dog or cat.
Crate size, collar and harness size and the cost of a dog.
Dog Crate Size Calculator
What size crate your dog needs from two measurements, plus an IATA travel crate check.
Dog Collar and Harness Size Calculator
Collar length and harness size from your dog’s neck and chest measurements.
Cost of Owning a Dog Calculator
First-year, yearly, monthly and lifetime cost of a dog, with the ASPCA’s published figures.
Fish tank volume and heater size.
Checked formulas
Every calculator follows published veterinary sources, such as AAHA, WSAVA, NRC and the Merck Veterinary Manual, and is tested against hand-worked values.
Pounds or kilograms
US units (lb, inches, US gallons) or metric (kg, cm, litres) with one tap, with UK-friendly wording throughout.
Not a vet visit
Our tools are general guides and never replace your vet. Results appear as you type and nothing you enter leaves your device.