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Pets
Pets Calculators
45 free pets calculators with clear, detailed guides.
All Pets Calculators
Aquarium CO₂ & Planted Tank Calculator
Calculate CO₂ levels in aquariums using the pH-KH method. Find the correct CO₂ dosing for planted aquariums and check carbonate hardness.
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Aquarium Fish Stocking Level Calculator
Calculate how many fish your aquarium can hold safely. Based on adult fish size and tank volume, with guidance on filtration and water quality.
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Aquarium Heater Size Calculator
Calculate the right wattage aquarium heater for your tank size. Based on tank volume, room temperature, and target water temperature.
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Aquarium Salt Mix Calculator — Marine & Freshwater
Calculate the correct salt amount for marine or brackish aquariums. Find the right specific gravity for fish-only, reef, or quarantine tanks.
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Aquarium Stocking Calculator
Calculate how many fish your aquarium can safely hold. Uses the inch-per-gallon rule with adjustments for fish type and filtration.
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Aquarium Volume Calculator (Litres & Gallons)
Calculate aquarium volume in litres and gallons from tank dimensions. Accounts for glass thickness, substrate, and the real water volume.
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Bearded Dragon Lighting, Temperature & Feeding Calculator
Calculate bearded dragon UVB requirements, basking spot temperature, and feeding schedule by age. Avoid the most common husbandry mistakes.
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Cat Age Calculator
Calculate your cat's age in human years. Uses the most accurate scientific formula — much better than the outdated 7x rule.
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Cat Food Portion Calculator
Calculate the correct daily food amount for your cat. Based on weight, age, and whether your cat is indoor or outdoor.
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Cat Litter Calculator
Calculate how much cat litter you need per month and per year based on your number of cats and litter box setup. Compares clumping vs non-clumping cost.
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Chicken Feed Calculator (Flock Daily & Annual)
Calculate how much feed your chickens need daily, monthly, and yearly. Layer feed quantities by flock size, plus feed cost estimates.
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Dog Age Calculator
Calculate your dog's age in human years using the scientifically accurate DNA methylation method — far more accurate than the old 7x rule.
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Dog Body Condition Score Calculator
Assess your dog's body condition score and ideal weight range based on breed size and current weight. Identify if your dog is under or overweight.
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Dog Daily Calorie & Food Portion Calculator
Calculate your dog's daily calorie needs based on weight, age, breed size, and activity level. Find the right dry food portion and check for healthy weight.
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Dog Daily Exercise Calculator (By Breed & Age)
Calculate how much daily exercise your dog needs by breed, age, and energy level. Walking time and activity recommendations.
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Dog Food Portion Calculator
Calculate the correct daily food portion for your dog based on weight, age, and activity level. Works for dry, wet, and raw feeding.
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Dog Walker Cost vs Self Calculator (UK)
Calculate the true cost of professional dog walking vs walking your dog yourself. UK 2026 rates, time value, and break-even point.
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Dog Walking Calorie Calculator
Calculate calories burned walking your dog — for both you and your dog. Based on walk duration, pace, and your respective weights.
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Fish Feeding Frequency Calculator
Calculate the right feeding amount and frequency for any aquarium fish — community, goldfish, cichlids, betta, and more.
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Fish Tank Size & Stocking Calculator
Calculate how many fish your aquarium can hold. Find tank volume, filtration requirements, and the correct stocking level for freshwater and tropical fish.
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Fish Tank Volume Calculator
Calculate the volume of any fish tank in litres and gallons. Includes stocking density guidance and filter size recommendations.
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Garden Pond Size & Fish Stocking Calculator
Calculate the volume of a garden pond, how many fish it can support, pump flow rate needed, and how long it will take to fill.
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Goldfish Tank Size Calculator
Calculate the minimum tank size for goldfish. Covers common, fancy, and comet varieties — and explains why goldfish bowls are unsuitable.
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Guinea Pig Age Calculator
Calculate your guinea pig's age in human years and understand their life stage. Covers average lifespan and age-related health needs.
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Guinea Pig Food & Vitamin C Calculator
Calculate daily food portions for guinea pigs including hay, pellets, and fresh vegetables. Ensures adequate Vitamin C to prevent scurvy.
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Hamster & Small Pet Age Calculator
Calculate your hamster, gerbil, guinea pig, or rabbit's age in human years. Understand their life stage and care needs.
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Hamster Cage Size & Care Calculator
Find the minimum cage size for a hamster, calculate bedding depth, and check whether your setup meets current welfare guidelines.
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Horse & Pony Age Calculator
Calculate your horse or pony's age in human years. Understand life stage care needs from foal to veteran horse — feed, exercise, and health management.
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Horse Feed & Forage Calculator
Calculate daily forage and concentrate feed for any horse based on weight, workload, and condition. Avoid overfeeding and laminitis risk.
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Horse Weight Estimator
Estimate your horse's weight using heart girth and body length measurements. Calculate body condition score guidance and ideal weight range.
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Kitten Growth & Weight Calculator
Track your kitten's growth and predict their adult weight. Understand what's normal for their age and breed size — and when to be concerned.
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Parrot & Large Bird Food Calculator
Calculate how much to feed your parrot, cockatoo, or macaw daily. Based on species, size, and activity level — covering pellets, fresh food, and treats.
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Pet Bird Age Calculator
Calculate your pet bird's age in human years for parrots, budgerigars, canaries, cockatiels, and other common pet birds. Understand their life stage.
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Pet Insurance Cost & Cover Estimator
Calculate estimated pet insurance premiums and find the right level of cover for your dog or cat. Compare lifetime vs annual vs accident-only policies.
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Pet Insurance Cost Estimator
Estimate annual pet insurance costs for dogs and cats based on breed, age, and cover level. Compare lifetime vs annual policies.
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Pet Medication Dose Calculator
Calculate weight-based medication doses for dogs and cats. For guidance only — always confirm with your vet before administering any medication.
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Pet Pregnancy Due Date Calculator (Dog & Cat)
Calculate your dog or cat's due date from the mating date. Gestation length, whelping/queening timeline, and what to expect week by week.
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Puppy Weight & Adult Size Predictor
Predict your puppy's adult weight and size from their current age and weight. Covers small, medium, large, and giant breeds.
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Rabbit Age Calculator (Human Years)
Calculate your rabbit's age in human years and understand their life stage. Covers different breeds and average rabbit lifespans.
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Rabbit Diet & Feeding Calculator
Calculate the correct daily amounts of hay, pellets, and fresh vegetables for your rabbit based on weight and age. Avoid common rabbit feeding mistakes.
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Rabbit Hutch Minimum Size Calculator (RSPCA Standards)
Calculate minimum rabbit hutch and run sizes using RSPCA UK welfare standards. Floor area, height, and exercise space requirements.
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Reptile UVB & Enclosure Calculator
Calculate UVB lamp requirements, enclosure size, and temperature gradients for reptiles. Covers bearded dragons, leopard geckos, and other common species.
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Senior Dog Health & Nutrition Calculator
Calculate the right diet, exercise, and health checks for senior dogs. Identify your dog's senior age and care priorities.
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Snake & Reptile Age Calculator
Calculate your snake or reptile's age in human years. Covers corn snakes, ball pythons, royal pythons, leopard geckos, and bearded dragons.
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Tortoise Care & Hibernation Calculator
Calculate enclosure size, hibernation weight, UVB requirements, and care for common tortoise species. Find diet and housing for Hermann's, Spur-thighed,.
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About our pets calculators
Our pet calculators help owners care for their animals: age in human years for dogs, cats, and other pets; food and feeding portions; aquarium and pond volumes and stocking; medication dosing by weight; and more. Each gives a clear result with guidance on how to use it.
Pet care calculations benefit from getting the details right — actual tank volume for medication dosing, body-weight-based feeding, species-appropriate stocking — so these tools and guides explain the reasoning and flag where a vet’s advice matters.
Every calculator is free and needs no account. For health concerns and medication, always confirm with your vet — these tools support good care, they don’t replace professional advice.