Age Calculator
Find your exact age in years, months, weeks, days, and hours with leap year precision and birthday countdown.
About the Age Calculator
The CalcNest Age Calculator determines your exact chronological age down to the day, hour, and minute. It also reveals the day of the week you were born, your total lifespan in days and weeks, and counts down the days until your next birthday.
Mathematical Formula
Age = Target Date (YYYY-MM-DD) - Date of Birth (YYYY-MM-DD) Calculates exact chronological age in calendar years, months, and days, precisely accounting for month length variations and leap years.
Variables & Components
Worked Example: Age for Birth Date May 15, 1995 as of May 15, 2025
Determining exact age, total days lived, and next birthday countdown for someone born on May 15, 1995.
Step-by-Step Calculation
- Subtract birth year from target year: 2025 - 1995 = 30 Years
- Months and days match exactly: 0 Months, 0 Days
- Total Completed Months: 30 × 12 = 360 Months
- Total Elapsed Days (including leap years): 10,958 Days
- Day of week born: Monday, May 15, 1995
How to Use This Calculator
Select your Date of Birth in the date picker.
Optionally change the target reference date (pre-filled with today’s date).
Instantly view your exact age in years, months, and days.
Check your total days lived, total weeks, and birthday countdown.