Calculadora de Idade do Cão (em anos humanos)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
1°ano=15; 2°ano=+9; cada ano seguinte=+4
About this calculator
The Dog Age Calculator converts your dog's actual age into 'human years' using a widely accepted rule for medium-sized dogs. Unlike the myth that 1 dog year equals 7 human years, this formula considers that the first year of life corresponds to 15 human years, the second year adds 9 more years (totaling 24), and each subsequent year adds 4 years. Thus, a 5-year-old dog would be approximately 36 human years old.
To use the calculator, simply enter the dog's actual age (in years). The result is estimated for medium-sized dogs (10-25 kg). Small or large dogs may age differently: small breeds tend to live longer and age slower, while large breeds age faster. This calculator serves as a general guide to understanding your pet's life stage.
When to use? Ideal for owners who want to compare their dog's age to human age, especially for veterinary care, diet, and physical activity. For example, a 7-year-old dog (≈ 44 human years) is already considered senior and may need preventive exams. The calculator helps plan the animal's routine and health.
Cautions: The formula is an approximation. Consult a veterinarian for accurate assessments. Breed, genetics, and lifestyle influence aging. Do not use this calculation to determine medical treatments without professional guidance.
Frequently asked questions
Why isn't 1 dog year equal to 7 human years?
The 7-year rule is a myth. Studies show dogs age faster in early years. The formula used here (15, 9, 4) is based on scientific research and is more accurate for medium-sized dogs.
Does this calculator work for any breed?
It is most accurate for medium-sized dogs (10-25 kg). Small breeds age slower and large breeds age faster. For more precision, consult a veterinarian.
My dog is 10 years old. What is the human age?
Using the formula: 1st year = 15, 2nd = +9 (24), plus 8 years x 4 = 32, totaling 56 human years.
Can I use this calculator for cats?
No. Cats age differently. For cats, the first year equals about 15 human years, the second 24, and each following year 4, but this calculator is specific to dogs.
Does the result replace a veterinary evaluation?
No. The calculator is an estimate. Your dog's health depends on many factors. See a veterinarian for regular check-ups.