Age Calculator
The Age Calculator determines your exact age in years, months, days, hours, and even seconds. Enter your birth date and the calculator shows your precise age as of today or any specified date. This tool is useful for verifying age requirements, calculating age differences between people, determining eligibility for age-restricted services, or simply satisfying curiosity about exactly how old you are.
Formula
Age calculation: - Years: full years since birth - Months: remaining months after years - Days: remaining days after months - Total days: from birth date to target date - Total hours: total days x 24 - Total seconds: total hours x 3600 Accounts for leap years
Example
Birth date: 1990-06-15 Current date: 2026-09-09 Age: 36 years, 2 months, 25 days Total days: 13,229 Total hours: 317,496 Total seconds: 1,142,985,600
How to Use
- Enter your birth date
- Optionally enter a target date (defaults to today)
- The calculator shows your exact age
- Review years, months, days, and total time lived
- Use for age verification or curiosity
Frequently Asked Questions
How is age calculated?
Age is calculated by finding the difference between the birth date and the target date. Full years are counted first, then remaining months, then remaining days. Leap years are accounted for in the calculation.
Why does my age differ by a day from some calculators?
Different calculators may handle the birth day differently — some count it, some do not. Time zones can also cause a one-day difference. This calculator counts complete days between dates.
Can I calculate age for a future date?
Yes. Enter a future date as the target date to see how old you will be on that date. This is useful for planning milestones, retirement, or eligibility for age-restricted services.
How do I calculate age difference between two people?
Enter one person's birth date and the other person's birth date as the target date. The result shows the age difference in years, months, and days. This is useful for couples, siblings, or generational comparisons.
Does the calculator account for leap years?
Yes. The calculator correctly handles leap years. February 29 birthdays are handled properly — in non-leap years, the birthday is counted as March 1 for calculation purposes.