Count full years first
Your age in years only increases on your birthday. The day before your 26th birthday you are still 25 — even if only by a day.
Free age calculator
Age Calculator
Enter your date of birth and see your exact age — years, months and days — on any date you choose. The calculator also shows your total days lived, the weekday you were born and when your next birthday falls.
✓ Free to use
✓ No signup
✓ Browser calculation
Exact to the day
Years · months · days
Leap years handled
29 February rule stated
0 data sent
Calculated in your browser
Calendar arithmetic. Complete years, then complete months, then the remaining days — using real month lengths. Nothing you enter leaves your browser.
Calculate your exact age
DATE OF BIRTHAn example date is filled in. Replace it with your own date of birth.
YOUR EXACT AGE
Calendar method
Your exact age
—
YEARS
—
MONTHS
—
DAYS
Enter your date of birth to see the working.
The bar shows how far through your current year of life the age-on date falls. A date of birth after the age-on date is an error, not a negative age.
Recent checks · this session
Select Calculate my age to keep up to five checks while this page is open.
Understand the result
What does an age calculator do?
It counts the exact time between your date of birth and a date you choose — complete years first, then complete months, then the remaining days — using real calendar month lengths and leap years. A person born 15 March 2000 is exactly 26 years old on 15 March 2026, and 26 years, 4 months and 17 days old on 1 August 2026.
Then full months, then days
After the years, the calculator counts complete months using the real length of each month, and the days left over. No month is treated as 30 days.
29 February birthdays
A 29 February birthday falls on 1 March in a non-leap year. Born 29 February 2000, you turn 26 on 1 March 2026 — the same rule the SSC Age Calculator uses.
How it works
From date of birth to your exact age
Start with the date on your birth certificate. Then choose the date you want your age on — today, or any other date.
Enter your date of birth
Use the date on your birth certificate. An example date is filled in — replace it with your own.
Choose the age-on date
It starts as today. Change it to any past or future date to see your age then.
Read your exact age
Years, months and days, with the total days lived, the weekday you were born and your next birthday.
Copy or keep the check
Copy the labelled result, or select Calculate to keep the check in this page session.
The calculation, explained
How your age is counted
Age is counted by calendar subtraction with borrowing: complete years, then complete months, then the remaining days, using the real length of each month. A 29 February birthday falls on 1 March in a non-leap year — the same rule the SSC Age Calculator on this site uses — so a person born 29 February 2000 turns 26 on 1 March 2026.
1. Count completed years
26 completed years
15 March 2000 to 1 August 2026 is 26 full years.
2. Then completed months
4 completed months
From 15 March to 1 August is 4 full months.
3. Then remaining days
17 days
The result is 26 years, 4 months and 17 days — 9,635 days in total.
29 February birthdays fall on 1 March in non-leap years.
Born 29 February 2000, you are 25 years, 11 months and 30 days old on
28 February 2026 and exactly 26 on 1 March 2026. Your next birthday after
1 August 2026 is 15 March 2027 — in 226 days.
Worked examples
See the method with three real birthdays
Each example uses the calendar method above. Select one to load it into the calculator.
Exactly 26 on your birthday
15 March 2000
DATE OF BIRTH
26 years, 0 months and 0 days
AGE ON 15 MARCH 2026
Born 15 March 2000, she is exactly 26 years, 0 months and 0 days old on 15 March 2026 — her 26th birthday. Total: 9,496 days lived, and her next birthday is a year away.
9,496 days lived · born on a Wednesday
A leap-day birthday turns 26 on 1 March
29 February 2000
DATE OF BIRTH
26 years, 0 months and 0 days
AGE ON 1 MARCH 2026
Born 29 February 2000, he is 26 years, 0 months and 0 days old on 1 March 2026. A 29 February birthday falls on 1 March in a non-leap year, so on 28 February 2026 he is still 25 years, 11 months and 30 days old.
9,497 days lived · born on a Tuesday
Month-end borrowing
31 January 2000
DATE OF BIRTH
26 years, 0 months and 28 days
AGE ON 28 FEBRUARY 2026
Born 31 January 2000, she is 26 years, 0 months and 28 days old on 28 February 2026. February is short, so the calculation borrows January's 31 days — not 30 — to finish the count.
9,525 days lived · born on a Monday
Why the date matters
One birthday, four different ages
Your age is always an age on a date. Born 15 March 2000, the same person is a different age at each date below — which is why forms and exam notices always name the date they count from.
| Age-on date | Exact age | Total days lived | Completed months | Next birthday |
|---|---|---|---|---|
| 1 January 2026 | 25 years, 9 months and 17 days | 9,423 | 309 | 15 March 2026 (Sunday) |
| 15 March 2026 | 26 years, 0 months and 0 days | 9,496 | 312 | 15 March 2026 (Sunday) |
| 1 August 2026 | 26 years, 4 months and 17 days | 9,635 | 316 | 15 March 2027 (Monday) |
| 31 December 2026 | 26 years, 9 months and 16 days | 9,787 | 321 | 15 March 2027 (Monday) |
Always check which date an age is counted on. Your age today is not the number an exam notice, a form or a pension rule uses unless it names today.
When this check is useful
- Working out your age on a form's reference date, not just today.
- Checking how old you will be on a future date — a retirement date, a course start, a milestone birthday.
- Finding the weekday you were born, or when your next birthday falls.
When another tool decides
- Exam eligibility is counted on the crucial date in the exam notice — use the SSC Age Calculator for SSC exams.
- University conversions use each university's own formula — see the CGPA to Percentage Calculator.
- Official documents use the date of birth on your certificate, not a calculator result.
Get the input right
Common age-calculation mistakes to avoid
Dividing by 365.25
Dividing days lived by 365.25 gives an approximate age, not an exact one. It drifts by days around month ends and leap years.
Treating every month as 30 days
Months are 28 to 31 days long. A 30-day month gives the wrong day count whenever a short or long month is involved.
Counting 29 February wrong
In a non-leap year there is no 29 February. This calculator counts the birthday as 1 March — state the rule, or the age is off by a day.
Using today when the form names another date
Your age today is not the number a form or a notice uses unless it names today. Always check which date the age is counted on.
Frequently asked questions
Age calculator questions, answered
Clear answers about exact ages, leap-day birthdays, totals and what this tool does not do.
How is my exact age calculated?
By calendar subtraction: complete years first, then complete months, then the remaining days, borrowing from the previous month when the day count goes negative. Every month keeps its real length — 31 days for January, 28 or 29 for February — and leap years are counted as they fall. Born 15 March 2000, you are 26 years, 4 months and 17 days old on 1 August 2026.
What happens if I was born on 29 February?
Your birthday falls on 1 March in a non-leap year. This is the same rule the SSC Age Calculator on this site uses, and it follows from the borrowing arithmetic: born 29 February 2000, you are 25 years, 11 months and 30 days old on 28 February 2026 and exactly 26 on 1 March 2026. If an official decision turns on that single day, confirm it with the body concerned.
Can I calculate my age on a past or future date?
Yes. Change the age-on date to any date you like — a date in the past, or a future date such as a retirement date or an exam cut-off. A date of birth after the age-on date is an error, and the calculator says so plainly instead of showing a negative age.
What do the total days, weeks and months mean?
Total days is the number of days between your date of birth and the age-on date. Total weeks is the same span counted in full weeks, with the leftover days shown. Total months is your completed months — completed years times 12, plus completed months. Born 15 March 2000, on 1 August 2026 you have lived 9,635 days, or 1,376 weeks and 3 days, or 316 completed months.
How do I find the weekday I was born on?
The result shows it under your age: born 15 March 2000, you were born on a Wednesday. The weekday is counted on the calendar date itself, so it does not depend on your time zone.
Does the calculator store my date of birth?
No. The calculation runs entirely in your browser and nothing is sent anywhere. Recent checks are held in this page's memory only and disappear when you reload the page.
Why does another age calculator give a different result?
Some calculators divide by 365.25 days a year, or treat every month as 30 days. Those shortcuts drift by days around month ends and leap years. This calculator subtracts real calendar dates, so it matches the date arithmetic a form or a notice uses.
Can I use this age for an exam or an official form?
For an exam, use the calculator for that exam: the SSC Age Calculator on this site checks your age on the crucial date in the SSC notice, with the category relaxation applied. For a form, use the date of birth on your certificate — this tool counts age, it does not verify identity or eligibility.
Methodology and sources
Know the arithmetic behind the answer
This page counts age by calendar subtraction on Gregorian dates: complete years, then complete months, then the remaining days, with borrowing from the previous month. Dates are counted in UTC, so the result does not depend on your time zone. A 29 February birthday falls on 1 March in a non-leap year — the same rule the SSC Age Calculator on this site uses. No exam body or university endorses this tool, and it checks age only.
About the method
The totals are the same span counted three ways: days between the two dates, full weeks with the leftover days, and completed months. Every number on this page is computed by that method at render time from the dates shown — the worked examples, the comparison table and the calculator all use the same code. Your dates are never sent anywhere: the calculation runs entirely in your browser.
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