Age Calculator – Your Exact Age in Years, Months & Days

Next Birthday Calculator

Use the calculator above to find your exact next birthday date and a live countdown (when "Find age on" is today). You’ll see days, hours, minutes, and seconds until your next birthday. We handle February 29 birthdays correctly — in non‑leap years we use February 28 as the next birthday.

What is an Age Calculator?

An age calculator (or birthday calculator) gives your exact age in years, months, and days from your date of birth. Ours also shows total weeks and months, day of the week you were born, days until your next birthday, leap years lived, and life progress. All calculations run in your browser—no data is sent anywhere.

Use it to calculate your age for forms, milestones, or legal checks. For days between two dates or to add/subtract days, use our Date Calculator; for dog or cat age in human years, use our Pet Age Calculator; for more date and time tools, see Date & Time.

When to Use an Age Calculator

Forms and documents

Many forms need your age in years, months, and days. Our tool ensures you submit the right value.

Milestones and birthdays

Track 10,000 days, 18th or 21st birthdays, and other milestones. The timeline and badges show what you’ve already hit.

Legal age and events

Verify legal age or plan events by calculating age on a specific future date.

How to Use

1. Enter your date of birth.
2. Optionally set Find age on (default: today).
3. Results update automatically. Use Copy age summary or Share result to copy a shareable link.