Age Calculator — Your Exact Age, to the Minute

Enter Parameters

Adjust sliders or type values directly

Date of Birth

Age as of Date

Real-time Calculation Ready

Adjust parameters to see instant results

AI Summary & Key Formula

Age Calculator Quick Reference

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Quick Answer

An age calculator gives your exact age in completed years, months and days by subtracting your date of birth from a target date, borrowing days from the previous month when needed. For example, someone born on 15 March 1990 is 36 years, 6 months and 0 days old on 15 September 2026, which is 438 months, 1,904 weeks or 13,333 days. Use it for application forms, eligibility cut-offs and milestones; it works with calendar dates only, so the time of birth is ignored, and you can set any past or future target date.

How This Calculation Works

Values calculate dynamically in real-time as you enter figures or adjust sliders.
The equation on the right is exactly what the calculator runs — check any result by hand.

Core Equation

Age = Target Date − Date of Birth

Breakdown:
  Years = floor(total months / 12)
  Remaining months = total months mod 12
  Remaining days = days in the final partial month

Birthday countdown = Next birthday date − Today

How to Use the Age Calculator

Quick 3-step guide for accurate and fast calculations

STEP 01

Enter your date of birth

In the Age Calculator, fill in Date of Birth and Age as of Date.

STEP 02

Read your age in years

The Age Calculator instantly shows Age in Years, Full Age (Years, Months, Days), Total Months Lived and Total Weeks Lived, updating as you type.

STEP 03

Compare scenarios

Change Age as of Date to see how it affects Age in Years, then check the formula below to verify the math.

Specific Instructions:

Enter your date of birth in the date picker. The calculator automatically computes your exact age as of today. You can also enter a custom target date to calculate your age on any specific future or past date. The result shows your age in multiple units and the countdown to your next birthday.

Age Calculator Formula

The Age Calculator uses the following formula, calculated in your browser as you change the inputs:

Age = Target Date − Date of Birth Breakdown: Years = floor(total months / 12) Remaining months = total months mod 12 Remaining days = days in the final partial month Birthday countdown = Next birthday date − Today

Sources:

Worked Example: Age Calculator

Date of Birth: March 15, 1990 | Today: September 15, 2026 Age: 36 years, 6 months, 0 days Next birthday: March 15, 2027 (181 days away) Born on: Thursday

Calculations run in your browser — your inputs are never stored on our servers.Formula sources & methodology

Frequently Asked Questions — Age Calculator

How is exact age calculated?

Exact age is found by subtracting your birth date from the target date, field by field. Take the difference in years, months and days; if the day count is negative, borrow the length of the previous month and reduce the months by one, and if the months are negative, borrow 12 and reduce the years by one. For a 15 March 1990 birthday on 15 September 2026, that gives 36 years, 6 months and 0 days.

What is the minimum age for a bank account or passport?

Rules vary by country and institution, so always confirm with the bank or passport office. In India, RBI allows minors above 10 years to open and operate a savings account independently if the bank agrees, and a guardian operates the account for younger children. Passports can be issued to Indian citizens of any age, with parental consent needed for applicants under 18. Use the calculator to check the exact age on the application date.

Can I calculate my age in a future date?

Yes. Enter your date of birth and set the 'Age as of' date to any past or future day, and the calculator shows how old you were or will be on that date, in years, months and days, plus total months, weeks, days and hours. For example, someone born on 15 March 1990 will be exactly 40 years old on 15 March 2030 — useful for retirement, exam or visa age cut-offs.