Age Calculator

Key features

• Exact age in years, months and days, computed with calendar-aware month arithmetic (born on the 29th–31st? shorter months are handled correctly).
• Lifetime totals: total months, total weeks plus leftover days, total days and total hours.
• Next-birthday panel: days remaining (or “Today”), the weekday it falls on, the age you'll turn and the zodiac sign.
• Measure age at any date, not just today — handy for school cutoffs, visa rules or “how old were they when…” questions.
• One-click copy of a plain-text summary covering the age, totals and next birthday.

How it works

1. 1

   Enter the date of birth

   Pick the birth date in the first field. It's constrained to dates on or before the target date.

2. 2

   Set the target date

   “Calculate age at” defaults to today; change it to measure the age as of any other date.

3. 3

   Read the exact age

   Years, months and days appear front and centre, with the birth and measurement dates printed underneath.

4. 4

   Scan the totals and birthday cards

   Four tiles show months, weeks, days and hours lived; the next-birthday panel adds the countdown, weekday, zodiac sign and the age being turned.

5. 5

   Copy the summary

   The copy button grabs a single line with everything: age, total days, next birthday and zodiac.

Tips for better results

• 💡To check an age requirement (school enrolment, race age groups, pension dates), set “Calculate age at” to the cutoff date.
• 💡The hours tile multiplies total days by 24 — a fun figure for milestone birthdays.
• 💡February 29 birthdays are celebrated on February 28 in non-leap years, so the countdown always lands on a real calendar date.
• 💡Paste the copied summary into emails or party invitations instead of retyping the numbers.

Frequently asked questions