AgeCalculator
Work out your exact age from a date of birth with this free Age Calculator. It gives the answer in years, months and days, then adds your total days lived, hours alive and a countdown to your next birthday.
Calculate Your Age
Enter a date of birth to see the exact age and life statistics.
How the Age Calculator Works
Four quick steps to an exact age.
Enter Birthdate
Pick the date of birth in the date picker — any date works.
Set Reference Date
Leave "As Of" on today, or choose another date; a future date shows a projected age.
Calculate
Press "Calculate Age" for an exact result based on calendar-aware arithmetic.
View Life Stats
Read the age in years/months/days, total days, hours and weeks, plus the next birthday countdown.
What Is an Age Calculator?
How age computation works.
How age is calculated
An Age Calculator measures the time since a birth date using calendar subtraction — whole years first, then months, then days — so uneven months and leap years are respected.
Age goes up at midnight on the birthday. Someone born on March 15, 1995 is 30 years, 11 months and 27 days old on March 14, 2026, and turns exactly 31 the next day.
Leap year birthdays
Anyone born on February 29 sees the actual date only every four years. In other years many places treat March 1 as the legal birthday, and this calculator uses that convention.
Life statistics
Besides years, months and days, your age is turned into total days, hours and weeks. The figures can be eye-opening: a 30-year-old has lived more than 10,950 days.
When to Use an Age Calculator
Everyday reasons to need an age calculation.
Legal Age Verification
Check whether someone meets a minimum age requirement — for voting, driving, buying alcohol or retiring — on a given date.
Medical Records
Clinicians use exact age for dosing, growth charts, developmental checks and insurance eligibility.
Form Applications
Job, visa and insurance forms often ask for your precise age on a specific date.
Birthday Planning
See what day of the week your next birthday lands on and plan the party around it.
Sports Eligibility
Youth leagues check age cutoff verification against a season start date.
Personal Milestones
Count the days until milestone birthdays such as 18, 21, 30, 50 or 100.
Age Calculation Examples
Worked age calculations.
30 years old
Born Jan 15, 1996 → on Jun 23, 2026 = 30 years, 5 months, 8 days, or 11,117 days.
Child age
Born Sep 1, 2020 → on Jun 23, 2026 = 5 years, 9 months, 22 days — the kind of check used for school entry cutoffs.
Turning 18
Born Jul 4, 2008 → on Jul 4, 2026 = exactly 18 years, the age of legal adulthood in most countries.
Common Age Calculation Examples
Age calculation examples you can load and try.
Calculate Exact Age From Date of Birth
The everyday use: your exact age from your date of birth to today. Enter the birthdate, keep "As Of" on today and calculate — you'll see something like 30 years, 5 months, 8 days.
Calculate Age on a Specific Date
Want your age on a specific past or future date — a wedding day or an exam date, say? Put that date in "As Of Date" and calculate.
Calculate Age in Years, Months and Days
The answer is split into completed years, remaining months and remaining days, the form used on legal documents, medical records and official forms.
Calculate Total Days, Weeks and Months
Age is also shown as total days lived, total weeks and total months. A 30-year-old has lived about 10,957 days, or 1,565 weeks.
Interactive Age Example
Tap an example below to load it and see the answer straight away.
How Your Exact Age Is Calculated
A step-by-step look at calendar-aware age arithmetic.
Calculate Completed Years
First, full years are counted — a year only counts once the birthday has come round. Born March 15, 1995 and checking on September 26, 2026, you have 31 full years, because the March 2026 birthday has passed.
Calculate Remaining Months
Next come the complete months since the last birthday. From March 15 to September 15 is 6 complete months.
Calculate Remaining Days
Last, the remaining days after that month: September 15 to September 26 is 11 days. Altogether: 31 years, 6 months, 11 days.
Interactive Age Calculation Diagram
Change the dates below to watch the breakdown update step by step.
Age in Different Time Units
Your age in months, weeks, days, hours and minutes.
Age in Total Months
Total months = completed years × 12 + remaining months, so someone aged 30 years 5 months has lived 365 total months.
Age in Total Weeks
Total weeks = total days ÷ 7. Eleven thousand days is roughly 1,571 weeks.
Age in Total Days
Every day between the birth date and the reference date is counted, so leap years with 366 days are included exactly.
Age in Total Hours
Total hours = total days × 24, which puts a 30-year-old at roughly 263,000 hours.
Age in Total Minutes
Total minutes = total hours × 60 — for a 30-year-old, more than 15.7 million minutes.
Interactive Age Unit Converter
Use the calculator above to see your age in every unit at the same time.
Age on Any Date
Find an age at any point in time — past, present or future.
Find Your Age Today
By default the calculator gives your current age as of today — enter the date of birth and today's date is used automatically.
Find Your Age on a Past Date
Set "As Of" to a past date to see how old you were then — useful for old documents, photos or past eligibility checks.
Find Your Future Age
Set "As Of" to a future date to see how old you will be — for retirement planning, future milestones or age-restricted activities.
Interactive "Age on Date" Timeline
Tap a point on the timeline to use it as the reference date and see the age at that moment.
Next Birthday Countdown
See exactly when your next birthday arrives.
Days Until Your Next Birthday
The number of days remaining until your next birthday is shown, counted from the reference date — set a future "As Of" date and it counts from there.
Your Next Birthday Date
The full date of the next birthday, year included, appears — next year's date if this year's has already passed.
Day of the Week of Your Next Birthday
You also see what day of the week the next birthday falls on, so you know if it is a weekday or a weekend.
Interactive Birthday Countdown
Your next-birthday details appear below once you have run the calculator.
Leap Years and February 29 Birthdays
How leap year birthdays are handled.
How Leap Years Affect Age Calculation
A leap year comes every four years, except century years not divisible by 400, and adds February 29 for a 366-day year. Because every real day is counted, leap years are fully reflected in total-day figures.
What Happens When You Are Born on February 29?
A February 29 birthday falls on its real date only in leap years. The calculator accepts Feb 29 as a birthdate and, in other years, increases the age on March 1, following the most common legal convention.
How Age Is Calculated in a Non-Leap Year
For a February 29 birthday, the age moves up on March 1 in non-leap years. The day count stays exact because real calendar days are counted rather than assuming 365 days a year.
Interactive February 29 Example
See how a February 29 birthday behaves across different years.
Age Calculation Examples for Real Situations
Age checks for practical everyday scenarios.
Age for School or Admission Dates
Many schools require a child to reach a certain age by a cutoff date (say, 5 by September 1). Put the cutoff in "As Of" and the child's birthdate in the calculator to check.
Age for Forms and Applications
Job, visa and insurance forms often ask for your exact age as of a specific date; enter that date in "As Of" for the precise figure.
Age at a Future Date
Planning ahead? A future "As Of" date shows how old you will be then — for retirement, milestones or eligibility.
Age at a Past Date
Need your age on a historical date? Set "As Of" to that day for the exact answer, useful for legal and medical records.
Interactive Date Scenario Selector
Tap a scenario to load it into the calculator.
Why Age Calculator Results Can Differ
Why differences in age calculation methods happen.
Different Month-Length Calculations
Months run 28 to 31 days, so when the birth day is later than the days available in a month, calculators can treat the overflow differently. This one borrows from the last day of the previous month to work out the remaining days.
Leap-Year Handling
Some tools divide by 365.25 days per year as a shortcut. This calculator uses actual calendar dates and counts real days, so leap years are exact rather than approximated.
February 29 Birthday Rules
There is no single rule for when a Feb 29 birthday "happens" in a non-leap year — some systems use February 28, others March 1. This calculator uses March 1.
Different Reference Dates
Age changes daily, so a calculation just before midnight on your birthday eve differs from one just after. This calculator works from midnight (start of day) for every date.
Interactive Result Comparison
Compare dividing total days by 365.25 with true calendar subtraction.
Age Calculator Quick Reference
A compact guide to age calculations.
Common Age Calculation Questions
| Question | Required Input | Result Format |
|---|---|---|
| Age today | Date of birth | Years, months, days |
| Age on a past date | Date of birth + past "As Of" date | Years, months, days |
| Age on a future date | Date of birth + future "As Of" date | Years, months, days |
| Total days lived | Date of birth | Number of days |
| Total months lived | Date of birth | Number of months |
Age Result Formats
Every format below comes from the same birthdate and reference date:
Age Calculator FAQ
Answers to common questions about the Age Calculator.
Enter your date of birth. The calculator measures the gap between that date and today and reports it as years, months and days, along with the total days and hours you have lived.
Yes. Ages follow the Gregorian calendar, leap days included, and a February 29 birthday is handled correctly in non-leap years too.
Yes. Change the "As Of" date to any day, past or future, to see how old you were or will be then — handy for milestones, forms and events.
The results list your total days lived, plus total hours, minutes and weeks. Someone who has just turned 30 has been alive for roughly 10,957 days.
The calculator shows the date of your next birthday, how many days are left until it, and which day of the week it falls on.
Yes. It is free, needs no sign-up and works entirely in your browser — your birthdate isn't stored.