Date & Time
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Calculate age in years, months, and days from a birth date.
Calculate age
Compare a birth date with today or any target date to see the exact elapsed age.
Leave target date empty to calculate age as of today.
Age result
Results update instantly when you click calculate.
You are 0 years, 0 months and 0 days old.
Additional age statistics
How to use this age calculator
- Enter the birth date you want to measure from.
- Add a target date if you want to calculate age on a specific day, or leave it empty to use today's date.
- Optional: enable Include end date when you need an inclusive date count for planning or legal-style date spans.
- Click Calculate to see the exact age breakdown and total elapsed time.
Examples
- From January 1, 2000 to January 1, 2025 = 25 years, 0 months, 0 days.
- From February 29, 2012 to February 28, 2025 = 12 years, 11 months, 30 days.
- From March 10, 1990 to today = calculated automatically using your current local date.
What is an age calculator?
An age calculator measures the difference between a birth date and a second date, then expresses that span in years, months, and days.
This is useful when you need more than a rough age in years. Parents use it to track a child's age in months, applicants use it to confirm age requirements on a deadline, and planners use it to measure exact elapsed time between milestones.
Toolono's age calculator also shows total months, weeks, days, hours, minutes, and seconds. That makes it useful for both everyday questions and detail-oriented date calculations.
Age calculations can become tricky around leap years, short months, and birthdays that have not happened yet in the current year. A reliable calculator handles those edge cases consistently so the result matches the actual calendar rather than a rough day estimate.
If you leave the target date empty, the calculator uses today's date automatically. If you enter a custom target date, you can check age on a past or future day for school enrollment, retirement planning, anniversaries, or compliance checks.
Age calculator FAQs
How does this age calculator work?
It compares the birth date with a target date and calculates the exact calendar difference in years, months, and days instead of using a rough division of total days.
What happens if I leave the target date empty?
The calculator uses today's date automatically, which lets you quickly check current age without entering a second date.
Does the calculator handle leap years and February 29 birthdays?
Yes. The result is based on real calendar dates, so leap years, varying month lengths, and February 29 birthdays are accounted for in the final age breakdown.
What does Include end date mean?
That option counts the target date as part of the measured span. It can be useful when you need an inclusive date count for planning, eligibility windows, or document preparation.
Can I calculate age on a future date?
Yes. Enter any valid target date to see how old someone will be on that day, which is useful for upcoming birthdays, age-based eligibility, and long-term planning.