Detailed Age Calculator
Exact age in years, months and days, plus weeks, hours, minutes and seconds lived.
Results follow standard formulas and are rounded for display.
About the Detailed Age Calculator
This version goes beyond years and months. Enter a date of birth and you get the exact age in years, months and days, the total number of weeks, hours, minutes and seconds lived, and how many days remain until the next birthday.
The form is sent to the server and the result is shown on the same page. For a quick instant version that updates as you type, use the standard age calculator.
This page is the long-form age calculator. Besides years, months and days it shows weeks, hours, minutes and seconds lived and how many days remain until your next birthday. The result is calculated by the server when you submit the form and is shown straight away on the same page, so you can try several dates in a row without leaving. Signed-in visitors also see their recent calculations. Because the maths uses real calendar months, an age such as 26 years, 7 months and 28 days is exact rather than a rounded estimate, which makes it suitable for forms, eligibility checks and plain curiosity alike.
How to use it
Enter date of birth. Use the date picker.
Set the date to calculate to. It defaults to today. Change it to check age on a past or future date.
Submit. Read the full breakdown.
Worked example
Age: 26 years, 7 months, 28 days Total days lived: 9,738 Next birthday: 15 March 2027
Tips for good results
- Use a future date to see how old someone will be on a given day.
- Totals of hours, minutes and seconds count whole days from midnight to midnight.
- Check official rules for legal age cut-offs.
Common mistakes
- Using a birth date in the future.
- Swapping day and month in the date.
Common questions
Is the result exact?
Years, months and days are counted on the calendar. Hours, minutes and seconds are whole days multiplied out, so they assume midnight to midnight.
Is my date stored?
If you are signed in, recent calculations are kept in your history. Otherwise nothing is saved.
Why is there a submit button?
This version calculates on the server, so you press the button to see the result.
More calculators
Results follow standard formulas and are rounded for display.
