Age Calculator & Birthday Calculator

Date of Birth

Calculate Age As Of

Defaults to today

About the Age Calculator

The Age Calculator computes your exact age in years, months, and days from a birth date. It also shows upcoming birthday countdowns and interesting time-based statistics about your life. All calculations properly account for leap years and varying month lengths.

How to Use

Enter your date of birth using the date picker.
Optionally set a custom "Calculate Age As Of" date (defaults to today).
Click Calculate Age to see your exact age breakdown.
Review your total days, weeks, months lived, and next birthday countdown.

Formula Used

Age = Current Date - Birth Date
Days Lived = date difference (ms / 86,400,000)
Months = floor(total days / 30.44)
Hours = days × 24 | Minutes = hours × 60

The calculation accounts for leap years and the varying number of days in each month, giving you a precise year-month-day breakdown rather than a simple approximation.

Understanding Your Results

Exact Age (Y-M-D) Your precise age in years, months, and days, fully accounting for leap years and months of different lengths.

Days Lived The total number of days you have been alive since your birth date, including all leap days.

Next Birthday Countdown The number of days remaining until your next birthday, with a progress bar showing how far through the current year you are.

Important Note

Age calculation accounts for leap years and varying month lengths to provide maximum accuracy. For legal or official purposes — such as verifying eligibility for government schemes, retirement benefits, or passports — always reference your official birth certificate or government-issued identity document.

Share: Suggest a Calculator