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Age Calculator logoAge Calculator

A personal instrument of time

Age Calculator

Enter your date of birth to discover your exact age in years, months and days — together with the total days you have lived, a countdown to your next birthday and your birth profile. Everything is calculated on your device; nothing is ever sent.

  • Calendar-accurate
  • Leap years included
  • 100% on your device
Calculate AgeSee how it works
Age Calculator logo
Calculator

Calculate your age

precise to every single day

Keep today, or pick any other date in the past or the future.

100% on your device

Summa

Your age

A precise online age calculator: find your age in years, months and days, plus total days lived, your next birthday, zodiac sign, Chinese zodiac and generation.

Enter your date of birth to see your result

Your exact age, birthday countdown, total days and birth profile will appear here.

About this tool

The Age Calculator works out your age from your date of birth to today, or to any other date you choose.

The result appears in years, months and days, together with your total days, weeks and hours and a countdown to your next birthday. Every calculation runs in your browser, so your date of birth is never sent anywhere.

People use this online age calculator for 4 main jobs: checking their current age, finding their age on a specific date such as a school or job application deadline, working out the age gap between two people, and counting how many days are left until a birthday. The tool has 3 parts: the date of birth field, the reference date field and the results panel.

This page explains how to use the calculator, what the result shows, how to calculate age on a phone calculator and with an Excel formula, the 2026 age chart by birth year, special cases such as a 29 February birthday, and the situations where an exact age matters.

How to Use the Age Calculator

To use the Age Calculator, follow these 4 steps. The whole process takes less than 10 seconds.

  1. I

    Enter your date of birth

    Pick your full date of birth in the Date of birth field. The date format follows your browser language, for example day/month/year.

  2. II

    Set the reference date

    The Age on this date field is filled with today's date. Change it to see your age on a specific date in the past or the future.

  3. III

    Press Calculate Age

    The result appears right below the calculator in years, months and days, plus total days, weeks, hours and minutes.

  4. IV

    Copy or start again

    Copy result copies a summary of your age. Reset clears the fields for a new calculation.

Leave the reference date on today to see your current age. Change the reference date when you need your age on an exam date, an application deadline or a future birthday.

What Does This Age Calculator Show?

This age calculator shows 15 details in 4 groups: exact age, other time units, next birthday and birth profile.

The example uses a date of birth of March 12, 1998 and a reference date of July 1, 2026. An average year has 365.2425 days, which is about 52 weeks and 1 day, 8,766 hours or 525,949 minutes.

Sample resultBorn March 12, 1998 → July 1, 2026
28Years
3Months
19Days

Other time units

Total months
339
Total weeks
1,476 + 6 days
Total days
10,338
Total hours
248,112
Total minutes
14,886,720
Seconds lived
893,203,200

Next birthday

Days until birthday
254 days
Birthday date & weekday
Friday, March 12, 2027
Current year of age
30%

Birth profile

Weekday of birth
Thursday
Zodiac sign
Pisces
Chinese zodiac
Tiger
Generation
Generation Z
Next milestone
Day 15,000

Calculating a Baby's or Child's Age

For babies and toddlers, the calculator also shows total weeks and the remaining days. A baby born on August 20, 2025 is 8 weeks 4 days old, or 1 month 29 days, on October 19, 2025. Four weeks are not always one calendar month, because months are 28 to 31 days long.

Full weeks
8
+ 4 days
Calendar months
1
+ 29 days
Total days
60

How to Calculate Age on a Phone Calculator

To calculate age on a phone calculator, subtract the date of birth from today's date in stages: days first, then months, then years.

The built-in Calculator apps on iPhone, iPad and Android have no date functions, so each part is worked out separately.

Example: date of birth August 25, 2001, today's date June 10, 2026.

  1. 1

    Work out the days.

    10 − 25 = −15. The result is negative, so borrow 1 month. The month before June is May, which has 31 days: 10 + 31 − 25 = 16 days.

  2. 2

    Work out the months.

    Take June (6), subtract 1 for the borrowed month, then subtract the birth month August (8): 6 − 1 − 8 = −3. The result is negative, so borrow 12 months from the years: −3 + 12 = 9 months.

  3. 3

    Work out the years.

    2026 − 1 − 2001 = 24 years. One year comes off because 12 months were borrowed.

The final result is 24 years, 9 months and 16 days. For age from the birth year only, type 2026 − 2007 = 19, then subtract 1 if the birthday has not happened yet.

10 + 31 − 25 = 16

6 − 1 − 8 + 12 = 9

2026 − 1 − 2001 = 24

24 · 9 · 16

years · months · days

Order of subtraction: days → months → years.

iPhone and iPad

Keep the Age Calculator on your Home Screen: open this page in Safari, tap the Share button, then choose Add to Home Screen.

Android

Open this page in Chrome, tap the three-dot menu, then choose Add to Home screen. The calculator icon appears like an app.

This calculator runs in the browser and does not install widgets. A countdown on the iPhone Lock Screen, an Apple Watch Smart Stack or the Mac Notification Center needs a countdown widget app from the App Store or Google Play.

Excel Formula to Calculate Age

The Excel formula to calculate age is =DATEDIF(A2,TODAY(),"Y"), where A2 holds the date of birth.

It returns your age in complete years as of today. Replace TODAY() with another cell, such as B2, to get the age on a specific date.

English versions of Excel use the function names shown here with a comma (,) as the separator. Use a semicolon (;) instead if your regional settings use a decimal comma.

Google Sheets uses the English function names (DATEDIF, TODAY), with the separator set by the spreadsheet's locale.

C2fx=DATEDIF(A2,B2,"Y")&" years "&DATEDIF(A2,B2,"YM")&" months "&(B2-EDATE(A2,DATEDIF(A2,B2,"M")))&" days"
ABC
1Date of birthReference dateAge
208/25/200106/10/202624 years 9 months 16 days
Example results use A2 = August 25, 2001 and B2 = June 10, 2026.
What you needFormulaExample result
Age in complete years=DATEDIF(A2,B2,"Y")24
Months left after full years=DATEDIF(A2,B2,"YM")9
Days left after full months=B2-EDATE(A2,DATEDIF(A2,B2,"M"))16
Full age in one cell=DATEDIF(A2,B2,"Y")&" years "&DATEDIF(A2,B2,"YM")&" months "&(B2-EDATE(A2,DATEDIF(A2,B2,"M")))&" days"24 years 9 months 16 days
Age in years (alternative)=INT(YEARFRAC(A2,B2,1))24
Total days since birth=B2-A29,055

Microsoft notes that the "MD" argument of DATEDIF can return wrong results, so this table calculates the remaining days with EDATE. For birth dates on the 29th to 31st or on 29 February, Excel can differ from the calculator above by a day or a month, so compare the two before using the figure in a document.

Age Chart by Year of Birth 2026

People born in 2007 are 18 years old before their birthday and 19 years old after their birthday in 2026.

This chart shows both ages for every birth year from 1950 to 2026.

Year of birthBefore birthdayAfter birthday
20260 years0 years
20250 years1 year
20241 year2 years
20232 years3 years
20223 years4 years
20214 years5 years
20205 years6 years
20196 years7 years
20187 years8 years
20178 years9 years
20169 years10 years
201510 years11 years
201411 years12 years
201312 years13 years
201213 years14 years
201114 years15 years
201015 years16 years
200916 years17 years
200817 years18 years
200718 years19 years
200619 years20 years
200520 years21 years
200421 years22 years
200322 years23 years
200223 years24 years
200124 years25 years
200025 years26 years
199926 years27 years
199827 years28 years
199728 years29 years
199629 years30 years
199530 years31 years
199431 years32 years
199332 years33 years
199233 years34 years
199134 years35 years
199035 years36 years
198936 years37 years
198837 years38 years
198738 years39 years
198639 years40 years
198540 years41 years
198441 years42 years
198342 years43 years
198243 years44 years
198144 years45 years
198045 years46 years
197946 years47 years
197847 years48 years
197748 years49 years
197649 years50 years
197550 years51 years
197451 years52 years
197352 years53 years
197253 years54 years
197154 years55 years
197055 years56 years
196956 years57 years
196857 years58 years
196758 years59 years
196659 years60 years
196560 years61 years
196461 years62 years
196362 years63 years
196263 years64 years
196164 years65 years
196065 years66 years
195966 years67 years
195867 years68 years
195768 years69 years
195669 years70 years
195570 years71 years
195471 years72 years
195372 years73 years
195273 years74 years
195174 years75 years
195075 years76 years

Special Cases When Calculating Age

3 special cases often change the result of an age calculation: a 29 February birthday, the Gregorian and Hijri calendars, and Korean age counting.

How Do You Calculate Age If You Were Born on 29 February?

People born on 29 February turn a year older on 28 February in common years and on 29 February in leap years. The Age Calculator applies this rule to your age and to the birthday countdown.

  1. 0Feb 29, 2024Born
  2. 1Feb 28, 2025Common year
  3. 2Feb 28, 2026Common year
  4. 3Feb 28, 2027Common year
  5. 4Feb 29, 2028Leap year

The chance of being born on 29 February is about 1 in 1,461. Which date counts in non-leap years depends on the country and the purpose, so for official matters follow the rule of the authority involved.

Gregorian Age vs Hijri Age

Your Hijri age is about 3% higher than your Gregorian age. A Hijri year has 354 or 355 days, while a Gregorian year has 365 or 366 days. The gap is 10 to 11 days a year, so 33 Gregorian years are roughly 34 Hijri years.

17 years (Gregorian)≈ 17 years (Hijri)
25 years (Gregorian)≈ 25 years (Hijri)
33 years (Gregorian)≈ 34 years (Hijri)
40 years (Gregorian)≈ 41 years (Hijri)
50 years (Gregorian)≈ 51 years (Hijri)
60 years (Gregorian)≈ 61 years (Hijri)

The Age Calculator uses the Gregorian calendar. The Hijri figures above are estimates.

International Age vs Korean Age

International age starts at birth and goes up on each birthday, while traditional Korean age starts at 1 at birth and goes up every 1 January. South Korea officially switched to international age for administration on 28 June 2023.

18International
19Year age
20Traditional Korean

Example: born December 20, 2007, counted on July 1, 2026. Year age (current year minus birth year) is still used in Korea for a few rules, such as military service.

How to Calculate the Age Difference Between Two People

To find an age difference, enter the older person's date of birth as the birth date and the younger person's date of birth as the reference date.

The years, months and days shown are the age gap between them.

  1. 1

    Enter the older person's birthday in Date of birth.

  2. 2

    Enter the younger person's birthday in Age on this date.

  3. 3

    Press Calculate Age. The years, months and days in the result are the age difference.

Age difference example
Older sibling born
April 18, 1996
Younger sibling born
September 3, 2001
5Years
4Months
16Days

The older sibling was born on April 18, 1996 and the younger on September 3, 2001. Their age difference is 5 years 4 months 16 days, or 1,964 days.

If the order is reversed, the calculator shows a message that the birth date must come before the reference date. The difference in days stays the same whenever you calculate it.

When Do You Need to Calculate Your Age?

There are 10 common situations where you need your exact age, from applying for a driving licence to planning retirement.

  • 18

    Voting and legal adulthood

    Most countries set both the age of majority and the voting age at 18.

  • 16–18

    Getting a driving licence

    The minimum driving age ranges from 16 in most US states to 17 in the United Kingdom and 18 in most of Europe.

  • 4–7

    Starting school

    Children start primary school between the ages of 4 and 7, depending on each country's cut-off date.

  • 18–21

    Buying alcohol

    The legal drinking age is 18 in most countries and 21 in the United States.

  • 18–35

    Applying for visas and jobs

    Working holiday visas, scholarships and some jobs have age limits, such as 18 to 30 or 18 to 35 at the time of application.

  • 66–67

    Planning retirement

    The UK State Pension age is 66, and the US full retirement age is 67 for people born in 1960 or later.

  • 0–5

    Tracking a baby's or child's age

    Vaccination schedules, growth charts and BMI-for-age use a child's age in months and days, not just years.

  • Policy

    Applying for life insurance

    Insurers set your entry age from your last birthday or your nearest birthday, and premiums change with that age.

  • ±

    Finding an age gap

    Enter the older person's date of birth as the date of birth and the younger person's date of birth as the reference date to see the age difference.

  • 🎂

    Counting down to a birthday

    The calculator shows how many days are left until your next birthday and the weekday it falls on, which helps when planning a celebration.

This calculator does not measure pregnancy. Doctors and midwives date a pregnancy from the first day of the last menstrual period (LMP), an ultrasound scan or the IVF transfer date to set the estimated due date (EDD). The legal ages above reflect current rules and can change.

Frequently Asked Questions about the Age Calculator

01

How old am I today?

Your age today is the time between your date of birth and today's date, counted in years, months and days. Enter your date of birth in the Age Calculator, leave the reference date on today and press Calculate Age. The result shows your age in years, months and days, plus your total days and a countdown to your next birthday.

02

How do I check my age from my date of birth?

Check your age from your date of birth by entering your full date of birth in the Age Calculator and pressing Calculate Age. To do it by hand, subtract your date of birth from today's date in order: days, then months, then years. Borrow one month when the days are negative, and borrow 12 months from the years when the months are negative.

03

Is this age calculator accurate?

Yes, this age calculator is accurate to the day. It uses the Gregorian calendar with leap years, month lengths of 28 to 31 days and the 29 February birthday rule. Both dates are processed at midnight UTC, so time zones never shift the result. Only the live seconds counter follows your device clock.

04

What is the difference between calculating age from a birth year and from a date of birth?

Calculating age from a birth year gives two possible numbers, while calculating it from a date of birth gives one exact age. Someone born in 2007 can be 18 years or 19 years old in 2026, depending on whether their birthday has passed. A full date of birth settles that and adds the remaining months and days.

05

How old am I if I was born in 2007?

You are 19 years old in 2026 if you have had your birthday, or 18 years old if your birthday has not arrived yet. Going the other way, someone who is 19 in 2026 was born in 2007 or 2006. Enter your full date of birth for your exact age in years, months and days.

06

Is this age calculator free, and does it work on a phone?

Yes, this age calculator is free, needs no sign-up and works on a phone. It runs in the browser on Android, iPhone, iPad, Mac and Windows. Your date of birth is never sent to a server or stored, as set out in this site's Privacy Policy.