Dogs
Age, growth and sizing — the numbers behind your best friend.
Dog Age CalculatorConvert your dog’s age to human years the accurate way — by breed size, not the old times-7 myth.Puppy Weight CalculatorPredict your puppy’s adult weight from their current age and weight, with growth-curve math by breed size and a week-by-week growth guide.Dog Crate Size CalculatorFind the right crate size from your dog’s length and height, with standard crate dimensions and sizing tips for puppies that are still growing.
Cats
From kitten milestones to gracefully judging you in their senior years.
Cat Age CalculatorConvert your cat’s age to human years with the veterinary formula, see their life stage, and learn what changes to expect at each age.Kitten Age CalculatorEstimate a kitten’s age from weight, teeth and development milestones — essential for rescues — and get feeding guidance for that age.
Food & Feeding
Daily portions and calories, minus the guesswork.
Dog Food CalculatorWork out how many cups of food your dog needs per day from their weight, age and activity level, with kcal math and portion tips.Cat Food CalculatorCalculate your cat’s daily food portions — dry, wet or mixed — from their weight and activity, with calorie targets and weight-loss guidance.Puppy Feeding CalculatorGet your puppy’s daily food amount and meal schedule by age and expected adult size, with a switch-to-adult-food timeline.
Breeding & Health
Due dates, heat cycles and quick safety checks.
Dog Pregnancy CalculatorCalculate your dog’s due date from the mating date (63-day gestation), with a week-by-week pregnancy timeline and whelping checklist.Dog Heat Cycle CalculatorPredict your dog’s next heat from her last one, understand the four cycle stages, and know the fertile window if you plan to breed — or avoid it.Dog Chocolate Toxicity CalculatorAte chocolate? Estimate the risk level from your dog’s weight, the chocolate type and amount — and know when to call the vet immediately.
Other Pets
Fish, chickens and the rest of the family.
Aquarium CalculatorCalculate your fish tank’s volume in gallons and litres from its dimensions, with stocking guidance, heater wattage and water-change amounts.Chicken Coop Size CalculatorWork out the coop size, run area, nest boxes and roost length your flock needs, with space standards for chicken health and happiness.
Why Pet Parents HQ?
Every calculator here answers a real question pet parents actually ask — and answers it properly. Dog years aren't "times seven": size and breed change everything, and our calculators use the charts vets actually use.
Results update as you type, the method is always explained, and every page includes the reference charts behind the number. For guidance only — your vet always has the final word on your pet's health.