Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find your next birthday and zodiac sign.
What Does the Age Calculator Tell You?
This tool calculates the precise difference between two dates — typically your date of birth and today, though you can set any "age at date" to calculate how old you'll be in the future, or how old someone was on a specific date in the past. Results are shown in multiple formats: years, months, and days (the standard way age is expressed), plus total months, weeks, days, hours, minutes, and seconds for a full picture.
Beyond the raw age, the calculator also tells you your next birthday, how many days away it is, and your Western and Chinese zodiac signs — both derived entirely from your birth date with no personal data stored or transmitted.
When is an Age Calculator Useful?
Medical & Health
Healthcare forms frequently ask for exact age in years and months, especially for children's growth charts, medication dosages, and age-based screening recommendations.
Forms & Applications
Job applications, insurance forms, visa applications, and financial accounts often need your precise age or require confirmation that you meet a minimum age requirement.
Education & Eligibility
School enrollment age cutoffs, scholarship eligibility, youth sports age groups, and competition categories often require knowing an exact age on a specific date.
Milestone Planning
Planning a 50th birthday party, a 25th anniversary, or calculating the exact date someone was born 10,000 days ago — milestone moments often inspire age curiosity.
Your date of birth is never sent anywhere. All calculations happen locally in your browser.
Precise to the second. Accounts for leap years, month lengths, and exact dates throughout.
Calculate age as of any past or future date — not just today.
No account, no tracking, no limits. Free to use as many times as you like.
Track Important Dates & Events
For remembering birthdays, anniversaries, and countdowns year after year, calendar and event tracking apps make it effortless.
Frequently Asked Questions
Does this account for leap years?
Yes. The calculation handles leap years correctly — so if you were born on February 29th, your birthday is correctly recognised in both leap and non-leap years.
Can I calculate how old I'll be on a future date?
Yes — just change the "Age at Date" field to any future date. This is useful for things like knowing your age when you'll retire, when a child starts school, or on a specific anniversary.
How is the zodiac sign determined?
Your Western zodiac (sun sign) is based purely on your birth month and day — no birth time or location needed. Your Chinese zodiac is based on your birth year according to the Chinese lunar calendar cycle of 12 animals.
How accurate are the total hours and minutes?
The totals are based on the number of full days elapsed, multiplied by 24 (hours) or 1,440 (minutes). They don't account for your specific birth time — for that level of precision, you'd need to enter your time of birth too.
Frequently Asked Questions
How accurate is the age calculation?
The calculator computes your exact age accounting for leap years, varying month lengths, and the precise time of day if you enter a birth time. Results are accurate to the minute.
Can I calculate the age between any two dates?
Yes — the calculator accepts any two dates, not just birthdays. Use it to calculate the time between any two events: how long a project has been running, how long until a deadline, or the age of anything with a known start date.
What is the zodiac sign calculation based on?
Western (tropical) astrology zodiac signs, based on the traditional solar calendar date ranges. The calculator also shows the Chinese zodiac year.
How far in the future can I calculate?
The calculator handles any date supported by JavaScript's Date object — dates up to approximately the year 275,760. For practical use, any date within the next century is handled accurately.
Does it work offline?
Yes — the calculator works entirely in your browser with no internet connection required once the page is loaded.