Cat Age in Human Years Calculator 2026
Find out how old your cat is in human years using the AAHA standard. Enter your cat's age and instantly get the human equivalent and life stage.
Pet calculators — dog and cat
Caring for a pet requires accuracy — the right food portion, knowing your animal's true biological age, and understanding daily calorie needs are the foundations of a healthy life for your companion. Our pet calculators let you convert dog or cat age to human years in seconds, determine daily feeding amounts, and check how many calories your pet needs based on body weight and activity level.
Dog Age Calculator — human years by size
Convert your dog's age to human years based on size. Small, medium, large or giant dog — instant online result with life stage detection.
Dog Calorie Calculator — daily energy requirements (RER/MER)
Calculate how many calories your dog needs per day. The RER and MER calculator accounts for weight, age, activity level and physiological status (pregnancy, nursing, obesity). Also shows dry and wet food amounts.
Dog Medication Dose Calculator — mg/kg
Calculate the single and daily medication dose for your dog by weight (mg/kg). Convert to tablets or syrup volume. Always consult a veterinarian before giving any medication to your dog.
Cat Food Calculator
Calculate how much food your cat needs per day. Enter weight, lifestyle and food calorie density — get RER, MER and grams of dry or wet food plus pouch count. Free, no signup required.
Dog Pregnancy Calculator — whelping due date
Calculate your dog's expected whelping date from the mating date. Track pregnancy week, phase, and days remaining until birth. Average dog gestation is 63 days.
Dog Food Calculator
Calculate how much food your dog needs per day. Enter weight, life stage and food calorie density — get RER, MER and grams of dry or wet food. Free, no signup required.
Dog Ownership Cost Calculator — monthly cost of keeping a dog
Calculate how much a dog costs per month and per year. The dog ownership cost calculator covers food, vet care, grooming, accessories, insurance and treats. See the 10-year total.
Aquarium Calculator
Calculate your aquarium volume in litres, water weight, and the maximum recommended number of fish. Free online aquarium calculator.
Cat Cost Calculator
Calculate the monthly, annual, and 10-year cost of owning a cat. Include food, vet bills, accessories, and insurance. Free online calculator 2026.
Veterinary Cost Calculator
Calculate annual and monthly veterinary costs for your dog or cat. Includes check-ups, vaccinations, parasite prevention and insurance. Free online calculator.
Dog Cost Calculator
Calculate the monthly and annual cost of owning a dog. Factor in dog size, food quality, vet bills, and extra expenses. Free online calculator 2026.
How to use pet calculators?
Pet calculators are practical tools that help in the day-to-day care of dogs, cats, and other companion animals. They allow you to quickly and accurately compute key health and nutrition parameters without needing to consult a veterinarian for every minor question. **Dog age to human years converter** The popular myth says one dog year equals seven human years. In reality, the relationship is far more complex and depends on the breed and size of the animal. According to research published by scientists at the University of California San Diego, the conversion is based on comparing DNA methylation patterns. Small dogs age more slowly than large breeds. Our calculator takes the animal's size into account and provides an approximate biological age consistent with current scientific knowledge. **Calculating daily food portions** The amount of food depends on the animal's weight, age (puppy, adult, senior), physical activity level, and type of food (dry kibble, wet food, raw BARF diet). The basic formula for energy requirements uses the Resting Energy Requirement: RER = 70 × (body weight in kg)^0.75. This result is then multiplied by an activity factor ranging from 1.2 for a sedentary neutered animal up to 2.0 for highly active working dogs. **Cat calorie requirements** Cats have different needs than dogs. An average, inactive adult cat weighing 4 kg needs approximately 200–240 kcal per day. Kittens during growth phases may need up to twice as much energy. Our calculator accounts for spaying or neutering, which significantly reduces caloric needs and is a common cause of obesity in indoor cats. **Practical tips for pet owners** Regularly weighing your pet and adjusting food portions is the cornerstone of obesity prevention — the most common dietary disease among companion animals. Veterinarians recommend weighing your dog or cat once a month and comparing the result to the ideal body weight for the breed. Keep in mind that our calculators are informational tools and do not replace veterinary advice in cases of illness or special dietary needs. Use our calculators regularly to give your pet a long, healthy, and happy life by your side.
Frequently asked questions about pet calculators
How do I calculate my dog's age in human years?
The old rule of 1 dog year = 7 human years is outdated. Modern research shows that small dogs under 10 kg age more slowly. Our calculator accounts for breed size and provides an approximate biological age based on current scientific data.
How much food should I feed my dog each day?
The amount depends on the dog's weight, age, activity level, and food type. The base formula is RER = 70 × (weight in kg)^0.75, multiplied by an activity factor. For an average adult dog with moderate activity, the factor is typically 1.6.
Does a spayed or neutered cat need less food?
Yes. Spaying or neutering reduces a cat's caloric needs by approximately 20–30%. Our calculator includes a toggle for altered animals, allowing you to precisely adjust the daily portion and prevent obesity.
At what age is a dog considered a senior?
Small breeds (under 10 kg) enter their senior years around age 10–12, medium breeds around 8–9, and large or giant breeds as early as 6–7 years old. Senior pets need a special diet with lower calories and higher levels of joint-supporting nutrients.
What is the ideal weight for my cat?
Most domestic cats should weigh between 3.5 and 5.5 kg, though this varies by sex and build. A reliable test is the body condition score (BCS 1–9): being able to feel the ribs without excess fat is a sign of a healthy weight.
Can I use these calculators for rabbits or small rodents?
The age and food calculators are primarily designed for dogs and cats. For rabbits, guinea pigs, or rats, the caloric norms and age conversions differ — in those cases, always consult a veterinarian who specialises in small mammals.
How often should I weigh my dog?
Veterinarians recommend weighing an adult dog once a month. Puppies and older dogs should be weighed more frequently — every two weeks — to monitor proper growth rates or detect unexpected weight loss.
Does the calculator account for dry vs wet food?
Yes. Wet food contains roughly 70–80% water, giving it a much lower caloric density than dry kibble. Our calculator lets you select the food type and adjusts the portion weight accordingly to deliver the correct amount of energy.
What is a BARF diet and how do I calculate portions?
BARF (Biologically Appropriate Raw Food) is a diet based on raw meat, bones, and vegetables. The standard guideline is 2–3% of the dog's body weight per day for adults and 5–10% for puppies. The BARF calculator helps you work out the proportions of each ingredient.
Do calculator results replace veterinary advice?
No. Our calculators are educational and informational aids only. In cases of illness, food allergies, pregnancy, or special dietary requirements, always consult a licensed veterinarian.