Age Calculator
Exact chronological age with real calendar math (leap years included), plus the fun stats. Nothing is uploaded — math runs in your browser and the URL is shareable.
Pick your birth date — every stat computes instantly.
Tip: your result URL is shareable — send it to anyone and they see the same calculation.
Why month-length borrowing matters
Naive calculators divide milliseconds by 30.44 “average” days and drift within a year. Real age math subtracts like a human: borrow from the previous month's true length (28, 29, 30 or 31 days). Born Jan 31? On Mar 1 you are exactly 1 month and 1 day old — not 1.03 months.
Explore by intent
How Old Am I?
Find your exact age in years, months and days instantly. Plus total days lived, next birthday and fun life stats.
Days Old Calculator
Count your exact days alive, plus weeks, hours, minutes and heartbeats. Leap-year accurate, instant, private.
Birthday Countdown
How many days until my birthday? Instant countdown plus weekday you were born and half-birthday date.
Chronological Age Calculator
Chronological age in years;months;days format for standardized testing, with an as-of date override. Free and exact.
Half-Birthday Calculator
Find your half-birthday instantly: six months from your birth day, adjusted for short months.
Age in Weeks Calculator
Convert your age to exact weeks old. Total weeks = floor(total days / 7), leap-year accurate.
Age in Hours Calculator
How many hours have I been alive? Exact total hours (days × 24) plus minutes and heartbeats.
Korean Age Calculator
Convert to Korean age (man-nai after 2023 reform) vs international age. See both side-by-side.
Age Difference Calculator
Calculate the exact age gap between two people in years, months, days and total days.
Leap Year Birthday Calculator
Born Feb 29? Get your exact age, next real Feb 29, and the Feb-28 rule for non-leap years.
What Generation Am I? Calculator
Enter your birth year and find your generation: Gen Alpha, Gen Z, Millennial, Gen X, or Boomer — with date ranges.
Zodiac & Chinese Zodiac Calculator
Find your Western zodiac sign and Chinese zodiac animal from your birth date — with element and traits.
Retirement Age Calculator
Estimate retirement date from birth date and target retirement age (60/65/67) — plus years, months and days remaining.
Exact Age Calculator
Calculate your exact age down to the day with total days, weeks, hours and minutes — borrow-accurate and leap-aware.
Frequently asked questions
How do leap-year birthdays work?
Feb 29 birthdays legally fall on Feb 28 or Mar 1 in most jurisdictions. Day counts here are always exact elapsed days; next-birthday maps Feb 29 → Feb 28 in common years.
Can I compute age at a past date?
Yes — use the “age at date” field. Examiners and genealogists use this for test norms and records. Bookmark the ?dob=YYYY-MM-DD&asOf=YYYY-MM-DD URL for the record.
Is my birth date sent anywhere?
No. All math runs in your browser; nothing is transmitted or stored.
How do I share my result?
After picking dates, click “Copy share link.” Anyone opening it sees the same calculation — no signup.
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