Age Calculator

Find your exact age in years, months, days, hours, and more — plus next birthday countdown and life milestones

Your Age

Enter your date of birth and click Calculate.

Frequently Asked Questions
Exact age is calculated by finding the difference between your date of birth and the target date (today by default). The calculator counts complete years first, then remaining complete months, then remaining days. Leap years are automatically handled — if you were born on February 29, your birthday is counted on March 1 in non-leap years.
Age in total days is the exact number of calendar days you have been alive, counting every day from your date of birth to today. This includes all leap year days. On average, a person who is 30 years old has lived about 10,958 days, accounting for leap years.
The 12 Western zodiac signs: Aries (Mar 21–Apr 19), Taurus (Apr 20–May 20), Gemini (May 21–Jun 20), Cancer (Jun 21–Jul 22), Leo (Jul 23–Aug 22), Virgo (Aug 23–Sep 22), Libra (Sep 23–Oct 22), Scorpio (Oct 23–Nov 21), Sagittarius (Nov 22–Dec 21), Capricorn (Dec 22–Jan 19), Aquarius (Jan 20–Feb 18), Pisces (Feb 19–Mar 20). Your sign is determined solely by your birth month and day.
Yes! The "Age at Date" field defaults to today but you can set it to any past or future date. This lets you calculate how old you will be on a specific future date, or verify how old someone was on a historical date.
The calculator automatically shows you how many days until your next birthday after you enter your date of birth and calculate. It accounts for leap years (e.g., if you were born on Feb 29, your next birthday in a non-leap year is counted to Mar 1). If today is your birthday, it shows a special message!
Age in hours is calculated by multiplying the total number of days you've been alive by 24. For example, if you are 10,000 days old, you have lived approximately 240,000 hours. Note that this is an approximation as it doesn't account for the exact time of birth within a day.
Yes — this calculator displays your age broken down into years, months, days, total days, total hours, and total minutes. For example, a 25-year-old has lived roughly 9,125 days, 219,000 hours, and over 13 million minutes. These figures assume no time-of-birth adjustment and are calculated to the current date.
The Gregorian calendar is the global standard, but other systems exist. The Islamic (Hijri) calendar is lunar and runs about 11 days shorter per year, making a person's Islamic age slightly older. The Chinese calendar is lunisolar, and in traditional East Asian age reckoning, a person is considered 1 year old at birth and gains a year each Lunar New Year rather than on their birthday.
Legal age milestones vary by country but common benchmarks include: age 16 for driving in many countries, age 18 for voting and legal adulthood in most nations, and age 21 for alcohol consumption in the United States. Age of criminal responsibility ranges from 7 to 14 depending on the jurisdiction. Always check local laws for specific rights and responsibilities.
People born on February 29 (a leap day) only have a true calendar birthday every 4 years. In non-leap years, most countries and legal systems recognise either February 28 or March 1 as the official birthday for legal purposes — England and Wales use March 1, while Scotland uses February 28. This calculator counts leap day birthdays to March 1 in non-leap years.

About This Age Calculator

This free Age Calculator computes your exact age from your date of birth to any target date. It shows your age in years, months, days, total weeks, total days, and approximate hours. Additional features include a next birthday countdown, zodiac sign, birth day of the week, and a life milestones table (first steps at 1, school at 5, driving at 16, retirement at 65, etc.).

Age in Days Reference

AgeApprox. DaysApprox. Weeks
1 year36552
5 years1,826261
10 years3,652522
18 years6,574939
25 years9,1311,304
30 years10,9581,565
40 years14,6102,087
50 years18,2632,609

Standards & References

Related Health Tools
BMI Calculator Due Date Calculator BMR Calculator Sleep Calculator

Related Articles

In-depth guides and technical articles.

View all →
Health Aug 11, 2026
The Relative Age Effect: Why Birth Month Shapes School and Sport
Children born just after a school or sport cutoff date are up to a year older than their classmates. That gap shapes selection, confidence, and outcomes for years.
Health Jun 29, 2026
Processing Speed Peaks at 25, Vocabulary at 65 — Why "Peak Age" Depends Entirely on What You're Measuring
Cognitive processing speed peaks at 18-25, but vocabulary peaks in the late 60s, emotional regulation improves into the 70s, and crystallized intelligence doesn't decline until the 70s-80s. Here's the multiple-peaks framework for human performance, why processing speed loss doesn't translate to overall cognitive decline (strategy, knowledge, metacognition compensate), why marathon runners peak later than sprinters, and the relative age effect that makes September-born UK children more likely to be identified as gifted.
Health Jun 23, 2026
Why Your Exact Birthday Determines Your Pension Age — and the Break-Even Math on Deferring It
State pension age is no longer a single fixed number — it varies by birth year cohort, and three people currently the same age will reach pension age at different years depending on exactly when they were born. Here's how different pension systems define retirement age, the break-even calculation for deferring pension (spoiler: you need to reach roughly 84 for UK deferral to pay off), and why "are you 65 in this tax year" has multiple valid interpretations that affect eligibility.
Health Jun 14, 2026
Why "Exact Age in Years, Months, and Days" Has More Than One Right Answer — and What Happens If You're Born on Feb 29
"33 years, 9 months, 21 days" sounds precise — but because months have different lengths, the algorithm used to calculate the "months and days" portion involves a genuine implementation choice that can produce different results for the same two dates. Here's how the year/month/day "borrowing" algorithm works, why February 29th birthdays create a recurring ambiguity with real legal implications, and why "months" as a unit is inherently approximate.
Health Jun 11, 2026
Age in Different Cultures and Legal Systems: Korean Reckoning, Age of Majority, and Leap Year Birthdays
South Korea officially ended traditional age reckoning in 2023, where everyone ages on New Year's Day making you 1-2 years "older" than by Western count. The US drinking age of 21 is unusual globally; Germany allows beer at 16; Scotland sets adulthood at 16 for contracts. Here's how age is defined differently around the world.