The Age Calculator determines your exact age in years, months, and days from any date of birth to any target date. Beyond your basic age, it shows total days lived, total weeks, total months, and even how many days remain until your next birthday. Perfect for filling out official documents, planning birthday celebrations, calculating age eligibility for programs, or simply satisfying your curiosity. Enter any two dates and get precise results instantly - all processing happens locally in your browser.
Select or type your date of birth using the date picker. You can enter any valid date in the past. The date picker supports manual typing in YYYY-MM-DD format if you prefer to type directly.
The target date defaults to today. You can change it to calculate your age at any specific date - past or future. This is useful for determining your age at a specific event, eligibility date, or historical milestone.
Press the Calculate Age button to compute your exact age. The calculation accounts for varying month lengths and leap years to give you a precise result down to the day.
Your age is displayed in years, months, and days, along with additional statistics: total days lived, total weeks, total months, and days until your next birthday. Click the copy button to copy the summary to your clipboard.
This calculator correctly accounts for leap years in all its calculations. Leap years have 366 days instead of 365, and February has 29 days instead of 28. The calculator uses actual calendar dates for its computation, so age calculations spanning leap years are accurate to the exact day.
Yes, you can calculate the age or time difference between any two dates by changing both the birth date and the target date fields. This makes the tool useful for calculating durations for historical events, project timelines, or any two-date comparison.
Age calculation methods can differ in how they handle month boundaries. For example, from January 31 to February 28 - is that one month or less? This calculator uses the standard convention: if the day of the target month is less than the birth day, it borrows from the previous month. This matches how most governments and institutions calculate age.
Total days is calculated by taking the difference between the two dates in milliseconds and dividing by the number of milliseconds in a day (86,400,000). This gives an exact count of days including all leap years and varying month lengths. The result is always a whole number rounded down.
Most legal systems consider a person to have reached a given age on their birthday. For example, a person born on March 15, 2000 turns 25 on March 15, 2025. This calculator uses the same convention. Some jurisdictions have special rules for leap year birthdays (February 29) - typically treating March 1 as the legal birthday in non-leap years.