新着

年齢計算機

正確な年齢を年、月、日で計算します。生きた総日数、週数、次の誕生日までの日数を確認できます。

生年月日とオプションの基準日を入力して正確な年齢を計算します

年齢
生年月日を選択して計算してください
年齢はカレンダーの日付に基づいて計算されます。基準日はデフォルトで今日ですが、変更して任意の時点の年齢を計算できます。

How to Use This Tool

  1. 1

    Enter your date of birth

    Use the date picker to select your birth date. The format follows your browser's locale settings.

  2. 2

    Optionally change the target date

    By default the target date is today. Change it to calculate age at any specific date in the past or future.

  3. 3

    View your exact age

    The calculator displays your age in years, months, and days, along with total days, weeks, and months lived.

  4. 4

    Check your next birthday

    See how many days remain until your next birthday countdown, displayed automatically below the result.

Frequently Asked Questions

How does the age calculator determine exact age?
It computes the difference between the birth date and target date accounting for varying month lengths and leap years, giving you precise years, months, and days.
Can I calculate age between two arbitrary dates?
Yes. Change both the birth date and target date fields to compute the elapsed time between any two dates, not just from birth to today.
Does this tool account for leap years?
Absolutely. The calculation correctly handles leap years and months with different numbers of days to ensure accurate results.
How is the next birthday countdown calculated?
It finds the next occurrence of your birth month and day after the target date and counts the remaining calendar days.