Date of Birth Calculator — Age by DOB
Date of birth calculator and birth calculator to find age by DOB in years, months, and days. Also covers DOB year and janm tarikh style searches.
Date of birth calculator (DOB / birth calculator)
A date of birth calculator turns the date on your ID into exact age. Enter DOB once and read years, months, and days — plus total days lived and the weekday you were born. The same tool covers birth calculator, online dob calculator, age calculator by date of birth, and common misspellings such as date of birth calculater.
date of birth calculator
Age math runs in your browser. No account. Free.
How to calculate age by date of birth
- Enter date of birth / birth date / जन्मतारीख exactly as printed on your certificate or ID.
- Leave Today’s date alone for current age, or set it to a form cut-off.
- Read completed years, leftover months and days, totals, and next birthday.
Match day and month carefully. Swapping DD/MM with MM/DD is the fastest way to get a wrong answer even when the year is right.
birth calculator
What “age according to DOB” means
Forms that say age according to DOB, age calculator from date, or age calculator by date want calendar age derived from the birth date — not a guess from birth year alone. Two people born in the same year can be a full completed year apart depending on month and day.
Date of birth calculator year
When a field asks only for years (date of birth calculator year / year calculator from date of birth), use the completed years line in the result. Do not round up months. For a year-focused layout, open the year calculator or age in years.
Janm tarikh / जन्म तारीख / डेट ऑफ बर्थ
“Janm tarikh,” “जन्मतारीख,” and “डेट ऑफ बर्थ” all mean date of birth. Enter that calendar date above — same math as an English DOB calculator. Prefer Marathi labels? Use वय कॅल्क्युलेटर.
Birth calculation vs inventing a DOB
This page calculates age from a known birth date. It does not invent a missing date of birth from age alone. If you only know approximate age, you cannot recover an exact DOB without other records.
Worked example
DOB: 12 May 1998 · As on: 9 November 2026
Result: 28 years, 5 months, 28 days. Completed age for most forms: 28.
Change the end date to the notice cut-off if the form says “age as on …” instead of today — see the as-on-date calculator.
When to use a different tool
- Full Y/M/D emphasis → years, months & days
- Exam cut-offs in India → age calculator India
- Birthday weekday / countdown focus → birthday calculator
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