Our free age calculator tells you exactly how old you are in years, months and days, and how long is left until your next birthday. Pick your date of birth, press one button and you get a precise answer that already accounts for leap years and months of different lengths.

People use this age calculator to fill in application forms, check eligibility for exams, jobs and pensions, plan birthday celebrations or simply settle a debate about who is older. Everything runs in your browser, so your date of birth is never stored or sent anywhere.

What Is an Age Calculator?

An age calculator is a date tool that measures the time between two dates: your date of birth and the current date. Instead of a rough number of years, it gives your chronological age broken into complete years, complete months and leftover days, which is the format used on most official documents.

Working this out by hand is easy to get wrong because months have 28, 29, 30 or 31 days and leap years add an extra day every four years. An age calculator handles all of that automatically using the Gregorian calendar rules that most countries follow.

How to Use the Age Calculator

You only need your date of birth. Follow these four quick steps:

Step 1: Select Your Date of Birth

Click the Select Date of Birth field and choose your birthday from the calendar, or type it in. Double-check the day and month order, because 05/08 means 5 August in some countries and 8 May in others.

Step 2: Click Calculate Age

Press the Calculate Age button. The age calculator compares your date of birth with today's date on your device and works out the difference.

Step 3: Read Your Age in Years, Months and Days

Your current age appears in three boxes: Years, Months and Days. This is your exact age today, the same format schools, embassies and HR departments usually ask for.

Step 4: See How Long Until Your Next Birthday

Below your age, the Next Birthday In line counts down the months and days left until you turn a year older. It is handy for planning a party or a gift in advance.

How Is Age Calculated?

The age calculator follows the same three-stage method a person would use with a calendar:

1. Count full years: subtract your birth year from the current year, then take one away if your birthday has not happened yet this year.
2. Count full months: count the months from your last birthday up to the most recent date that matches your birth day.
3. Count remaining days: add up the days left after the last full month, using the real length of that month.

Worked example: born on 15 August 1995, checked on 5 October 2026. From 15 August 1995 to 15 August 2026 is 31 full years. From 15 August 2026 to 15 September 2026 is 1 full month. From 15 September to 5 October is 20 days (15 days left in September plus 5 in October). So the exact age is 31 years, 1 month and 20 days, which is what the age calculator shows.

Age Calculator Examples

These examples show exact ages on 5 October 2026 for a few different birthdays, including a leap day birthday:

Why Your Exact Age Matters

• Forms and applications: passports, visas, university and job forms often ask for age in completed years on a specific date.
• Eligibility rules: competitive exams, sports leagues, insurance and pension schemes set minimum or maximum ages.
• Health and growth: doctors use exact age in months for babies and children when checking growth charts.
• Milestones: knowing exactly when you turn 18, 30 or 60 helps you plan legal, financial and personal milestones.

Tips for Accurate Results

• Check your device date: the age calculator uses today's date from your phone or computer, so make sure it is correct.
• Use the official date of birth: enter the date shown on your ID or birth certificate.
• Leap day birthdays: if you were born on 29 February, the calculator still counts full years correctly in non-leap years.
• Different calendars: the result uses the Gregorian calendar; convert lunar or other calendar dates first.

Why Use This Age Calculator?

• Exact: years, months and days, with leap years handled for you.
• Birthday countdown: see how long is left until your next birthday.
• Private: your date of birth stays on your device.
• Free and fast: no sign-up, works on phone, tablet and laptop.

Frequently Asked Questions