Calculadora de Idade
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
idade = ano_atual − ano_nascimento
About this calculator
The age calculator is a simple and practical tool that determines how old a person is based on their birth year and a reference year. Just enter these two values to get the result instantly. Ideal for quick age calculations for documents, forms, or curiosity.
The operation is straightforward: subtract the birth year from the reference year. For example, if someone was born in 1990 and the reference year is 2024, the age is 34 years. The calculator does not consider months or days, providing only the age in full years.
Use this calculator when you need to quickly find out a person's age without complications. It is useful for filling out registrations, calculating length of service, planning retirement, or simply satisfying curiosity. Remember that the result is an approximation, as it does not take into account the month and day of birth.
Frequently asked questions
How to correctly calculate age if the person hasn't had their birthday in the reference year?
This calculator considers only full years. If the person hasn't had their birthday in the reference year, the calculated age will be one year more than the actual age. For accuracy, use a calculator that considers the full date.
Can I use this calculator for animal ages?
Yes, the calculation is the same: subtract the birth year from the reference year. However, remember that age equivalence between species is different.
What is the difference between this calculator and one that uses full date?
This calculator uses only years, ignoring months and days. The full date provides exact age considering the birthday.
What if I enter a future birth year?
The result will be negative, indicating that the person hasn't been born yet. This can be useful for hypothetical calculations.