How to Calculate Age from a Birthday Online — Free Tool

Step 1: Enter the Date of Birth

Select or type a date of birth using the date picker. You can also enter a custom target date if you want age at a specific time.

Step 2: View the Exact Age Breakdown

Your exact age in years, months, days, hours, and total days lived appears instantly once a date is selected.

Step 3: See Your Next Birthday

The tool shows how many days remain until the next birthday and which day of the week it falls on.

Step 4: Done

No steps needed — the result is instant. Use it for age verification, form filling, or just satisfying curiosity.

Date of birth data never leaves your browser — no server stores or processes your personal information.

Age calculates immediately when you select a date with no button press required.

Shows days until the next birthday and the day of the week it falls on.