Age Calculator
The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.
Leave blank to use today's date
Age Calculator: Determine Your Exact Age in Years, Months, Days
Our free online age calculator helps you calculate your exact age or the time elapsed between two dates. Whether you need to know your age in years, months, weeks, days, or even hours and seconds, this comprehensive tool provides precise results instantly.
How to Use the Age Calculator
- Enter your birth date in the first field (defaults to 30 years ago)
- Select the “Age at Date” (defaults to today’s date)
- Click “Calculate” to see your exact age and time elapsed
Why Use Our Age Calculator?
- Precise calculations down to the second
- Multiple time units (years, months, weeks, days, hours, minutes, seconds)
- Mobile-friendly design works on all devices
- No registration required – completely free to use
- Instant results with no waiting
Common Uses for Age Calculations
People use our age calculator for various important purposes:
- Birthday planning – Calculate exact age for milestone birthdays
- School admissions – Verify age requirements for enrollment
- Legal purposes – Determine age for contracts, licenses, or benefits
- Medical records – Track precise patient ages
- Genealogy research – Calculate ancestors’ ages at specific events
- Retirement planning – Know exactly how long until retirement age
How Age Calculation Works
The calculator determines your age by calculating the exact time difference between your birth date and the selected date. It accounts for:
- Leap years – Including February 29th births
- Month length variations – Different days in each month
- Time zone differences – Uses your local date selection
Frequently Asked Questions
How accurate is the age calculator?
Our calculator provides 100% accurate results based on the dates you enter. It accounts for all calendar variations including leap years and different month lengths.
Can I calculate age at a future date?
Yes! Simply enter a future date in the “Age at Date” field to calculate how old you or someone else will be on that date.
Why does the calculator show months and days separately from years?
We break down the results to show both your full years of age plus remaining months and days for greater precision than just showing decimal years.
Age Calculation Formulas
The calculator uses these precise mathematical formulas:
- Years: Current year minus birth year (adjusted for month/day)
- Months: 12 months per year plus current month difference
- Days: Days remaining after full months calculation
- Total days: Exact count between two dates
- Hours/Minutes/Seconds: Multiples of days (24/1440/86400 respectively)