Age Calculator — exact age from date of birth
Find your exact age in years, months, weeks, days, hours and minutes. Plus zodiac sign, generation, next birthday countdown, life milestones, and fun stats. Everything runs in your browser — your data never leaves your device.
What you'll use the age calculator for
Exact age to the minute
Get your precise age in years, months, days, hours and minutes — useful for legal forms, astrology charts, and just knowing.
Tenure & seniority
Show exactly how long you've been at a company in years, months, and days — perfect for CVs, LinkedIn, and reviews.
Life milestones
Find out when you crossed 10,000 days, 1 billion seconds alive, and when your next decade birthday arrives.
Anniversaries
Count the exact days since your wedding, first date, or any special moment that deserves to be remembered.
Zodiac & generation
Instantly discover your Western zodiac sign, Chinese zodiac animal, generation label, and the day of the week you were born.
Child age tracking
Track a child's age precisely for medical visits, school enrollment, or milestone tracking — months and days matter early on.
How to use the age calculator
Enter your date of birth
Pick your birth date using the date picker. Optionally add a birth time for an even more precise result down to the hour and minute.
Set the "as of" date
Leave it as today for your current age, or change it to calculate your age on any past or future date.
Read your age breakdown
Your exact age appears instantly — years, months, weeks, days, hours, and minutes. Below you'll find your zodiac signs, generation, birthday countdown, life milestones, and fun stats.
Explore the extra modes
Switch to "Date difference" to measure the gap between any two dates, or "Add / subtract" to find a date before or after a given one.
Frequently asked questions
The calculator counts completed years (full birthdays), then completed months since the last birthday, then leftover days, hours, and minutes. This matches exactly how humans phrase age: "32 years, 5 months, 12 days."
The tool finds your next upcoming birthday from today's date and counts the exact days remaining. A progress bar shows how far through your current birth-year you are — from your last birthday to your next one.
Western zodiac is based on your birth month and day. Chinese zodiac is based on your birth year (a 12-year animal cycle). Both are calculated instantly in your browser — no external lookup.
Yes. The calculation walks calendar units, so February has 28 or 29 days depending on the year. A person born on Feb 29 is treated as aging on Feb 28 in non-leap years.
The milestone tracker shows: 1,000,000 minutes alive (~1.9 years), 10,000 days alive (~27.4 years), 1 billion seconds alive (~31.7 years), 100,000 hours alive (~11.4 years), and your next decade birthday (30th, 40th, 50th, etc.). Each shows the exact date and whether it's been reached.
Dates are interpreted in your local time zone. If you need UTC, adjust the dates accordingly before entering them.
No. Every calculation runs entirely in your browser using native JavaScript date APIs. Your date of birth and any other inputs never leave your device.
About age calculation
Calculating an exact age sounds trivial — subtract birth date from today. In practice, calendar units don't line up neatly: months have 28–31 days, leap years add an extra day every 4 years (with exceptions), and daylight saving time can shift results by an hour.
The human vs. the mathematical result
- Human form — "32 years, 5 months, 12 days." Walks the calendar a year at a time, then month by month, then day by day. This is how doctors, lawyers, and immigration forms phrase age.
- Total units — total weeks, total days, total hours, total minutes since the moment of birth. Useful for billing, age verification in code, and showing off to friends.
Zodiac signs
Western astrology divides the year into 12 signs based on the sun's position at birth — determined by month and day. Chinese astrology uses a 12-year cycle of animals. Both systems are determined by date alone and are calculated instantly without any external service.
Generational labels
Generations are rough cultural groupings: Silent Generation (born before 1946), Baby Boomers (1946–1964), Generation X (1965–1980), Millennials (1981–1996), Generation Z (1997–2012), and Generation Alpha (2013 onward). The boundaries vary by source — these are the most widely cited ranges.
Life milestones
Certain numeric thresholds feel like achievements: 10,000 days alive is roughly age 27, 1 billion seconds is roughly age 31.7, and 100,000 hours is roughly age 11.4. Knowing when you crossed — or will cross — these is a surprisingly motivating perspective on time.