Free Age Calculator.
Use this free age calculator to calculate your exact age from your date of birth. Instantly find your age in years, months, and days, plus your total age in months, weeks, and days.
Calculate your exact age in years, months, and days. Select your date of birth and the date to calculate age on (defaults to today), then click Calculate.
Age Calculator
Age: —
Next birthday in: —
| Total months | — |
| Total weeks | — |
| Total days | — |
An age calculator is a simple tool that calculates how old someone is based on their date of birth and a reference date. Instead of estimating, it calculates the precise time difference between the two dates.
This calculator shows your age in:
Years, months, an days
Total months
Total weeks
Total days
How to Calculate Age From Date of Birth
Step 1: Enter your date of birth
Select the day, month, and year you were born.
Step 2: Choose the date to calculate age on
This defaults to today, but you can choose any date in the past or future.
Step 3: Click Calculate
The calculator instantly shows your exact age and a full breakdown of time lived.
Free Age Calculation Examples
Example 1: Calculate current age
- Date of birth: 15 March 1990
- Age on: Today
Result:
- Age: 34 years, 9 months, 5 days
- Total days lived: 12,700+ days
Example 2: Age on a specific date
- Date of birth: 1 January 2000
- Age on: 31 December 2025
Result:
- Age: 25 years, 11 months, 30 days
This is useful when checking eligibility, anniversaries, or legal age requirements on a specific date.
Why calculate age in years, months, and days?
Calculating age in years alone is often not enough. Many official forms, medical records, and applications require an exact age, including months and days.
This calculator:
- Accounts for leap years
- Uses actual calendar months (not estimates)
- Avoids rounding errors
So you can rely on the result for accurate age calculations.
Frequently Asked Questions (FAQ) on Age Calculators
How accurate is this age calculator?
This calculator is highly accurate. It uses real calendar dates, accounts for leap years, and calculates age based on exact date differences rather than averages.
Can I calculate my age on a future date?
Yes. You can select any future date to calculate how old you will be on that day.
How is age calculated for leap year birthdays (29 February)?
If you were born on 29 February, the calculator correctly adjusts for non-leap years when calculating age and upcoming birthdays.
Is this the same as a “how old am I” calculator?
Yes. This age calculator answers the common question “How old am I?” by calculating your age from your date of birth.
When should you use an age calculator?
This calculator is commonly used for:
- Personal age checks
- School or college applications
- Job applications and HR forms
- Legal or eligibility requirements
- Birthday and anniversary planning