# Calculadora de Idade — Anos, Meses, Dias e Hégira

> Calcule sua idade exata em anos, meses e dias a partir da data de nascimento, com total de dias, próximo aniversário e sua idade no calendário hégira. Grátis.

- **Category:** Data e Hora
- **Interactive calculator:** https://youcalc.com/pt/date-time/age-calculator/
- **Price:** Free, no sign-up required

## Overview

Your age is simple to say but fiddly to count exactly: months have different lengths, leap years add a day, and a birthday that has not yet come round this year quietly subtracts one. This calculator takes your date of birth and works out your age to the day — years, months and days — then adds the totals people often want: how many days, weeks and months you have lived, which day of the week you were born on, and how long until your next birthday. It also shows your age in the Hijri (Islamic lunar) calendar, which runs about eleven days shorter each year.

## How to read your result

The headline is your age in completed years; the line beneath breaks it down into years, months and days. The totals restate the same span in days, weeks and months. “Next birthday” counts the days to your coming birthday and the age you will turn. The Hijri section gives your age and birth date in the Islamic lunar calendar — because a lunar year is roughly 354 days, your Hijri age is a little higher than your Gregorian one.

## Method

Age in years counts completed birthdays up to the as-of date; the remaining months and days are measured from your most recent birthday, respecting each month’s real length and leap days. Total days is the plain day count between the two dates, total weeks is that divided by seven, and total months is years × 12 plus the leftover months. The Hijri age is computed with the tabular (arithmetic) Islamic calendar through the same day count, so it is fully deterministic; a moon-sighting or Umm al-Qura date can differ by a day or two.

## Example

- **Setup:** Born 1 January 2000, calculated on 3 June 2025.
- **Result:** You are 25 years, 5 months and 2 days old — 9,285 days, 1,326 weeks, or 305 months. You were born on a Saturday, and your next birthday is on 1 January, when you turn 26. In the Hijri calendar you are about 26 years old.

## Frequently asked questions

### How is exact age in years, months and days calculated?

The calculator counts how many full years have passed since your birth, then how many whole months since that birthday, then the leftover days — using the true length of each calendar month and accounting for leap years. That is why “1 month” can be 28, 30 or 31 days depending on where it falls.

### What day of the week was I born on?

Enter your date of birth and the calculator shows the weekday — Monday through Sunday — alongside your age. It derives the weekday from the Julian day number of your birth date, so it is correct for any date, past or future.

### Why is my Hijri age higher than my Gregorian age?

The Hijri (Islamic) calendar is lunar: its year is about 354 days, roughly eleven days shorter than the 365-day Gregorian year. Over a lifetime those days add up, so your age counted in Hijri years is a little greater — by about one year every 33 years.

### How accurate is the Hijri age?

It uses the tabular (arithmetic) Islamic calendar, which is fully deterministic and standard for date arithmetic. A date fixed by actual moon-sighting or by the Saudi Umm al-Qura calendar can differ by one day, occasionally two, so close to a Hijri birthday the figure may shift by a day.

## Related calculators

- [Calculadora de geração](https://youcalc.com/pt/unique-playful/generation-calculator/)
- [Calculadora de idade hégira](https://youcalc.com/pt/date-time/hijri-age/)
- [Sua idade em 8 calendários](https://youcalc.com/pt/date-time/multi-calendar-age/)
- [Conversor de data hégira](https://youcalc.com/pt/date-time/hijri-date-converter/)
- [Calculadora de idade do cão](https://youcalc.com/pt/pets-animals/dog-age-calculator/)
- [Calculadora de idade do gato (anos de gato em humanos)](https://youcalc.com/pt/pets-animals/cat-age-calculator/)
- [Calculadora de diferença de idade entre duas pessoas](https://youcalc.com/pt/date-time/age-gap-calculator/)
- [Calculadora de Idade Corrigida para Prematuros](https://youcalc.com/pt/date-time/corrected-age/)

## Sources

- https://en.wikipedia.org/wiki/Age
- https://aa.usno.navy.mil/faq/islamic

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Interactive version: https://youcalc.com/pt/date-time/age-calculator/ · From YouCalc — https://youcalc.com