How do I calculate my exact age?

Enter your date of birth in the first field and today's date (or any specific date) in the second field. Click 'Calculate Age' to see your exact age in years, months, and days.

Does this calculator handle leap years correctly?

Yes, our Age Calculator uses calendar-aware logic that automatically accounts for leap years and the varying number of days in each month.

Can I calculate the time between two past dates?

Absolutely. You can enter any two valid dates to find the exact duration or time span between them, which is useful for historical research or employment history calculations.

Age Calculator — Calculate Your Exact Age (Years, Months, Days)

How this age calculator works

The age calculator finds the exact time difference between two calendar dates. It shows the result in years, months, and days, and also converts the same span into weeks, days, hours, minutes, and seconds.

Common uses

Calculate a person’s age on a given date.
Find the time between two historical events.
Check how long you have been working at a company or on a project.

Notes

The calculator assumes the starting moment is at midnight of the selected date. Time zones are not taken into account and the result is based purely on calendar dates.

Why use an online age calculator?

An online age calculator takes two calendar dates and instantly shows how much time has passed between them. Instead of counting years, months, and days by hand, this tool performs accurate date math in the background and returns a clear breakdown that anyone can understand. It is especially useful when you need an exact answer for forms, legal documents, academic projects, or personal milestones.

This age calculator is designed for everyday users, not just developers or math experts. You simply choose your date of birth and the “age at the date of” you are interested in, then click the calculate button. The tool handles leap years, different month lengths, and long time spans automatically.

Common situations where an age calculator is helpful

Checking your exact age today: Enter your date of birth and leave the second date as today to see your current age in years, months, and days.
Age on a future date: Want to know how old you will be on a specific birthday, graduation, or event date? Change the “age at the date of” to the future day and calculate.
Comparing historical dates: Researchers and students can use the calculator to find the time between important historical events or between a historical event and today.
Planning health checkups and milestones: You can pair this tool with the BMI calculator to track age-related changes in weight and health over time.
Employment and service calculations: HR teams and managers can quickly check years of service between a hire date and a reference date for benefits or eligibility.

How this age and date difference calculator works

The calculator first converts both selected dates into an internal time format. It then subtracts the earlier date (usually your date of birth) from the later date. The raw difference in milliseconds is converted into:

Years, months, and days (calendar-based difference).
Total weeks and remaining days.
Total days between the two dates.
Total hours, minutes, and seconds.

Showing the same span in different units gives you more context. For example, knowing that you are “28 years, 3 months, and 10 days” old is useful, but seeing that this is also “10,323 days” can make the time feel more tangible.

Accuracy, leap years, and edge cases

Manual age calculations are easy to get wrong, especially when leap years are involved. This tool uses calendar-aware logic that:

Automatically detects leap years and adjusts month lengths correctly.
Respects different month lengths (28–31 days) when borrowing days or months.
Handles very old or future dates, as long as they are valid calendar dates supported by your browser.

Because the calculations are based strictly on calendar dates, time zones and time of day are not included. For most personal and professional uses, this level of precision is more than enough.

Tips for interpreting your age result

Use the full breakdown when precision matters. Legal documents and official forms often need your age in completed years only, but project planning or research may benefit from seeing months, days, and total time as well.
Double-check the order of dates. The start date should be earlier than or equal to the end date. If you reverse them, the calculator will warn you.
Save results for records. After calculating your age or date difference, you can print the result card or save it as a PDF using the print button above.
Recalculate when details change. If you adjust either date, run the calculator again to make sure the displayed age reflects the latest inputs.

Age calculator vs. other date tools

Many websites offer countdown timers or simple birthday reminders. This age calculator is more flexible because it can:

Work with any two dates, not just today and your birthday.
Show multiple views of the same time span, from years down to seconds.
Support professional use cases like HR, research, and reporting.

In short, this page works as both a date of birth calculator and a precise date difference calculator in one place.

Who can benefit from this age calculator?

Students completing school or college projects that involve timelines or history.
Parents tracking their child’s exact age for medical checkups or school forms.
HR professionals measuring length of service and benefit eligibility dates.
Researchers and data analysts working with time-based datasets.
Anyone curious about how long an event, relationship, or milestone has lasted.

Final note

This age calculator is intended for general information and planning. It should not replace professional legal, financial, or medical advice. If you need an official age verification for government, immigration, or court purposes, always refer to the requirements of the relevant authority and use original documents in addition to tools like this.

Age Calculator

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