What is Age Calculator?
An age calculator works out exactly how old someone is from their date of birth. Instead of a rough number of years, it gives a precise breakdown in years, months and days, and can also express your age as total months, weeks, days and even hours. You can calculate age as of today or any chosen date.
It correctly accounts for leap years and the varying lengths of months, so the result is always accurate.
How to Use the Age Calculator
- Select your date of birth in the first field.
- Choose the date to calculate age at (today is filled in by default).
- Click Calculate Age.
- Read your exact age plus totals in months, weeks, days and hours.
Features of Our Age Calculator
- Exact age in years, months and days
- Totals in months, weeks, days and hours
- Calculate age at any past or future date
- Accurate leap-year and month-length handling
- Clean, instant results
- Fully offline and private
Benefits & Use Cases
People check ages for forms, eligibility and milestones, parents track a baby's age in weeks, and HR teams verify dates. Because it counts to the exact day, it is far more useful than simply subtracting birth years.
Your birth date is only used in your browser for the calculation and is never uploaded, keeping personal data private.
The Age Calculator is completely free, needs no sign-up or installation, and runs entirely in your browser — nothing you enter is uploaded to a server, so your data stays private. It works on desktop, tablet and mobile, in light or dark mode.
Tips & Best Practices
Set the second date to a future birthday to see exactly how old you will be then, or to a past date to find someone's age at a particular event. Because it counts real calendar days, leap years and the differing lengths of months are handled correctly — far more precise than simply subtracting birth years.
The totals in weeks and days are handy for tracking a baby's milestones or a project's age. To measure the gap between two arbitrary dates rather than an age, use the Date Difference Calculator.
FAQ about Age Calculator
Does it account for leap years?
Yes. The calculation uses real calendar dates, so leap years and the different lengths of months are handled correctly.
Can I find my age on a future date?
Yes. Set the second field to any future date to see how old you will be then.
Why show age in weeks and days?
Total weeks and days are useful for tracking infants, project timelines and precise milestones where whole years are too coarse.
Is my birth date stored?
No. The date stays in your browser and is used only to compute your age, so your personal information remains private.