Age Calculator
Calculate your exact age from your date of birth in years, months, weeks, days, hours, and minutes. Also find your next birthday, total days lived, and the age difference between any two dates, instantly.
- Exact Age
- Date of Birth Calculator
- Years • Months • Days
- Free & Instant
- Private
What can this age calculator calculate?
This age calculator works out your exact age, your total days and hours lived, your next birthday, and the age difference between any two dates.
Exact age
Your age in years, months, and days from your date of birth.
Age difference
The exact gap in time between any two dates you enter.
Days lived
The total number of days and hours you have been alive.
Next birthday
How many days until your next birthday and the weekday it lands on.
Leap year adjustment
Every leap day is counted, so your totals stay accurate.
Future age
How old you will be on any date in the future.
How is age calculated?
Age is calculated by comparing your date of birth with a selected date while accounting for leap years, varying month lengths, and the Gregorian calendar.
The calculator counts the number of full years since your birth, then the extra whole months, then the remaining days. Because it uses the true length of each month and every leap day, the result is your exact age rather than a rounded estimate.
How to use the age calculator
Enter two dates and read your result. It takes about ten seconds.
- 1Select your date of birth as the first date.
- 2Leave the second date on today, or pick any past or future date.
- 3Press calculate to see your exact age and full breakdown.
Common uses for an age calculator
People use an age calculator to confirm an exact age for official documents, school and job applications, medical records, insurance, and birthday milestones.
Government documents
Passports, licences, and official forms that require an exact date.
School admissions
Confirm age eligibility for school years and entrance cut-off dates.
Job applications
Check minimum age requirements for roles and work permits.
Medical records
Record precise age for appointments, screening, and dosing.
Insurance
Age to the day can affect quotes and policy eligibility.
Birthday milestones
Count down to birthdays and celebrate days-lived milestones.
Calculate the age difference between two dates
To find the age difference between two people, change the second date from today to the other person's date of birth, and the calculator returns the exact gap in years, months, and days.
Try it in the calculator aboveWhy this age calculator is accurate
This calculator uses the real Gregorian calendar with true month lengths and every leap year, so it returns your exact age with no approximations.
Real Gregorian calendar
Calculations follow the standard Gregorian calendar used worldwide.
Every leap year included
Each February 29 you have lived through is counted in your totals.
True month lengths
We use the real length of every month instead of a 30-day average.
No approximations
You get your exact age, not a rounded estimate.
- Leap year accurate
- Runs locally in your browser
- No data stored or shared
- Uses real calendar math
Frequently asked questions
Frequently Asked Questions
Common questions and answers about this calculator.
How do I calculate my age?
Enter your date of birth in the calculator above and it counts the full years, months, and days between that date and today to give your exact age.
How do you calculate age from date of birth?
Your age is found by subtracting your date of birth from the selected date, then adjusting for leap years and different month lengths so the result is exact.
How many days old am I?
Your total days lived is the number of days between your date of birth and today, including every leap day. Enter your birth date above to see the exact count.
How many hours have I lived?
Your total hours lived is your total days lived multiplied by 24. The calculator works this out automatically once you enter your date of birth.
How is age calculated during leap years?
Every leap year adds an extra day, February 29, to your day count. The calculator includes each leap day you have lived through so your total is accurate.
Can I calculate age for a future date?
Yes. Set the target date to any date in the future and the calculator shows how old you will be on that day.
Can I calculate age between two dates?
Yes. Change the target date from today to any other date and the calculator returns the exact time between the two dates.
Can I calculate someone else's age?
Yes. Enter their date of birth instead of yours to find their exact age in years, months, and days.
What is an exact age calculator?
An exact age calculator shows your age broken down into years, months, weeks, days, and hours, rather than only your age in whole years.
Why does my age change tomorrow instead of today?
Your age in days and hours increases every day at midnight, so those numbers update daily even though your age in years only changes on your birthday.
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Tool Information
August 2026
Dr. Jaydeep Sanghani
Meet Akabari
Dr. Jaydeep Sanghani
MBBS, MD, DNB(Anaesth.), PDCC(CCM), DrNB(CCM)
AIIMS Bhubaneswar · AIIMS Rishikesh
Critical care specialist and anesthesiologist with advanced training from AIIMS. Reviews health calculators at Calqulate to ensure medical accuracy and evidence-based standards.
About the authors
