Age CalculatorHow old am I? Exact age in years, months, days, hours and seconds

Enter your date of birth to see your exact age in years, months and days, your age in total weeks, days, hours and minutes, the weekday you were born, and a live countdown to your next birthday.

  • Calendar-exact borrowing
  • Leap-day birthdays handled
  • Age on any date
  • Live seconds counter
Manzoor Ahmad
Designed, developed & tested by Manzoor Ahmad, calculator developer
Last reviewed
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Age calculator

Your exact age

31years
4months
19days

Alive for0seconds and counting
0days to your
next birthday

How do you calculate your exact age?

Subtract your date of birth from today’s date: first the days, then the months, then the years. When the days don’t subtract, borrow the number of days in the previous month. When the months don’t subtract, borrow 12 months from the years. For example, someone born on June 15, 1995 is 31 years, 4 months and 19 days old on November 3, 2026. In total that is 11,464 days.

How to use the age calculator

  1. Enter your date of birth. Any date from the year 100 onward works, so you can also find the age of a historical figure or a building.
  2. Leave “Age on” as today, or pick any past or future date: “How old was I on my wedding day?” or “How old will I be on January 1, 2030?”
  3. Add a birth time if you know it to make the live seconds counter exact. Without it, the counter starts at midnight.
  4. Read the results: years-months-days, totals in every unit, the weekday you were born, your generation and a countdown to your next birthday.

Age formula

Days = Today's day − Birth day (if negative: + days in last month, months − 1)Months = Today's month − Birth month (if negative: + 12, years − 1)Years = Today's year − Birth yearTotal days = (Today − Date of birth) in days · Weeks = Days ÷ 7 · Hours = Days × 24

Worked example: born June 15, 1995, measured on November 3, 2026. Days: 3 − 15 won’t go, so borrow October’s 31 days: 34 − 15 = 19, and the month becomes 10. Months: 10 − 6 = 4. Years: 2026 − 1995 = 31. Age = 31 years, 4 months, 19 days.

Age by birth year chart

A quick lookup of how old someone turns this year and next. Generation names follow Pew Research Center’s definitions. *Generation Alpha (2013 onward) is a widely used label rather than a Pew-defined cohort.

Born inAge on birthday in 2026Age on birthday in 2027Generation
19468081Baby Boomer
19507677Baby Boomer
19557172Baby Boomer
19606667Baby Boomer
19646263Baby Boomer
19656162Gen X
19705657Gen X
19755152Gen X
19804647Gen X
19814546Millennial
19854142Millennial
19903637Millennial
19953132Millennial
19963031Millennial
19972930Gen Z
20002627Gen Z
20052122Gen Z
20101617Gen Z
20121415Gen Z
20131314Gen Alpha*
20151112Gen Alpha*
202067Gen Alpha*
202512Gen Alpha*

Why online ages sometimes disagree

Leap-day birthdays

If you were born on February 29, most legal systems treat February 28 or March 1 as your birthday in common years. This calculator uses February 28.

Month-end borrowing

From January 31 to March 1 some tools say “1 month 1 day” and others “29 days”. We count calendar months, the same way the chronological age calculator does.

East Asian age counting

Traditional Korean age counts you as 1 at birth. South Korea officially switched to international age in 2023. This calculator uses international age.

Time zones

Someone born at 11 PM in New York was born on the next day in London. Use the date on the birth certificate.

Related calculators

Your age is the starting point. These calculators answer the questions that usually come next:

Chronological Age CalculatorNeed the age for a test form? Get years;months;days with the examiner’s borrowing worksheet.Open Chronological Age Calculator →Age Difference CalculatorCompare two birth dates and see exactly how far apart two people are.Open Age Difference Calculator →Birthday CalculatorSee the weekday of each of your next 10 birthdays, plus your birthstone.Open Birthday Calculator →Days Alive CalculatorFind the date you turn 10,000 days old and your other life milestones.Open Days Alive Calculator →

More Age & Birthday calculators in this cluster:

Manzoor Ahmad

Manzoor Ahmad

Calculator Developer · Pharmacist · Founder of DexoCalc

I’m a pharmacist turned web developer with 13+ years of experience building web tools. Exact age matters in pharmacy, for example for age-based dosing limits and vaccine eligibility, and a one-day error can change the answer. I built this calculator on the same calendar-exact engine as our chronological age tool and tested it against leap-day births, month-end dates and dates centuries back. Report anything odd.

Published · Last reviewed · Author profile · Report an issue

Age calculator: frequently asked questions

Subtract your birth year from the current year, then subtract one if your birthday hasn’t happened yet this year. For an exact age, subtract days and months too, borrowing from the month and year when needed. The calculator does all of this instantly.

Enter your date of birth: the calculator shows your age in total days, plus weeks, hours and minutes. Someone born on June 15, 1995 is 11,464 days old on November 3, 2026.

Yes. Change the ‘Age on’ date to any past or future date, such as a retirement date, an application deadline or a wedding day, and the exact age on that date appears.

The result line shows the weekday you were born. For more birthday details, including your next 10 birthdays and their weekdays, use the birthday calculator.

In years without a February 29, the calculator treats February 28 as your birthday for the countdown. Age in years, months and days stays calendar-exact.

Using Pew Research Center definitions: Baby Boomers were born 1946–1964, Generation X 1965–1980, Millennials 1981–1996 and Generation Z 1997–2012. Those born from 2013 on are commonly called Generation Alpha.

No. The calculation runs entirely in your browser and nothing is sent to DexoCalc.

They’re the same number. ‘Chronological age’ is the term used in testing and medicine, usually written as years;months;days. The chronological age calculator shows the borrowing worksheet and test-manual rounding options.

Sources & references

  1. Defining generations: Where Millennials end and Generation Z begins, Pew Research Center
  2. ISO 8601: Date and time format, International Organization for Standardization
  3. Time and Frequency Division, National Institute of Standards and Technology

Ages are calculated from calendar dates in your browser’s time zone. For legal age questions (for example, eligibility dates), the rules of the relevant authority apply.

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