How it works
- Enter your date of birth.
- Choose today or another comparison date.
- Calculate your exact age in multiple units.
Age Calculator
Calculate an exact age in years, months, days, and smaller time units.
Age Calculator
Calculate your exact age in years, months, days, and more.
Calendar-accurate and optionally precise to the second.1. Enter Your Date of Birth
Date of Birth
2. Enter Comparison Date
Today’s Date
3. Your Age
Enter your birth date to calculate your age.
Next Birthday
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Lifetime Progress
0%Based on a 100-year milestone.
How is age calculated?
Age is calculated by comparing calendar anniversaries first, followed by complete months and remaining days. This avoids the inaccuracies caused by treating every month as the same length.
Practical guide
Using Age Calculator with confidence
Reviewed by LipiCode Editorial Team
What this tool helps you do
Calendar age is not the same as dividing elapsed days by 365. Month lengths and leap years vary, so years, months, and days must be calculated against actual calendar boundaries.
When it is useful
- Finding age on a specific date
- Calculating time between two dates
- Checking an eligibility date
- Comparing calendar and elapsed units
A practical example
For a birthday near the end of a month, subtract complete years first, then complete months, then remaining days. This avoids treating every month as if it had the same length.
Limitations and common mistakes
Legal age rules can depend on jurisdiction and may treat leap-day birthdays specially. Time zones also matter when including hours. Use the official authority's rules for eligibility decisions.
Frequently asked questions
Why are total days different from years × 365?
Leap years and varying month lengths add or remove days.
Can this determine legal eligibility?
It provides a calendar calculation, not legal advice or an authority's final determination.