Age Calculator — Exact Age, Date Difference & Age Compare
Calculate your exact age, count down to a future date, find the difference between any two dates, or compare two people's ages side by side.
Last updated: 2026-03-28
Choose a calculation mode
Pick the date calculation you need.
Age calculator
Enter your details
Enter your date of birth to calculate your exact age.
Your Age
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Enter your date of birth to see your exact age.
Calculation History (0)
Example calculations
Tap an example to prefill the calculator with sample values.
Age Calculator
Millennial Birthday
Born January 15, 1990
A typical millennial checking their exact age.
Result: 36 years, 2 months, 1 day
Gen Z Example
Born July 4, 2000
Someone born on Independence Day, 2000.
Result: 25 years, 8 months, 12 days
Retirement Age Check
Born March 20, 1960 — target age 65
Checking age on a specific future retirement date.
Result: 65 years, 0 months, 0 days
Time Until
New Year's Eve Countdown
How long until December 31, 2026?
Counting down to the next New Year's Eve celebration.
Result: 9 months, 15 days from now
Summer Vacation
How long until June 15, 2026?
Planning ahead for a summer trip.
Result: 2 months, 30 days from now
Date Difference
Project Timeline
Jan 1, 2025 to Dec 31, 2025
How long is a full calendar year in days and weeks?
Result: 11 months, 30 days
Lease Duration
March 1, 2024 to February 28, 2026
How long is a two-year apartment lease?
Result: 1 year, 11 months, 27 days
How the age & date calculator works
This calculator provides three date-based tools in one, selectable via the mode tabs above.
- Age Calculator — computes your exact age in years, months, and days from your date of birth to today (or a target date). Includes total days lived, total weeks, and a next-birthday countdown.
- Time Until — counts down to a future date showing years, months, days, total weeks, and total hours remaining. If the date has passed, it shows how long ago it was.
- Date Difference — finds the exact difference between any two dates in years, months, days, total weeks, and total months. Date order doesn't matter.
All modes account for varying month lengths and leap years to give precise results.
Age calculator FAQs
Answers to common questions about age calculation.
How is age calculated exactly?
The calculator counts complete years from your birth date, then complete months from the last birthday, then remaining days. It accounts for varying month lengths (28–31 days) and leap years.
Can I calculate age on a future or past date?
Yes. Use the optional target date field to see your age at any specific date. This is useful for eligibility checks, retirement planning, or milestone celebrations.
Does this account for leap years?
Yes. The calculator correctly handles leap years when counting days and determining month lengths. February 29th birthdays are handled properly.
What is the Time Until mode?
Time Until counts down the years, months, and days until a future date you specify. If the date has already passed, it shows how long ago it was. Great for event planning, deadlines, and countdowns.
How does Date Difference work?
Enter any two dates and the calculator shows the exact difference in years, months, days, total weeks, and total months. The order of dates doesn't matter — it always returns a positive result.
What does Age Compare do?
Age Compare takes two birth dates and shows both people's current ages, the exact gap between them (years, months, days), who is older, and the total number of days apart. Useful for siblings, partners, or anyone curious about the exact age difference.
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Disclaimer
This calculator provides results based on standard calendar rules. Leap years and varying month lengths are accounted for.
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