Age Calculator — From Birthdate, Free
Break the elapsed time between a birthdate and a selected date into years, months, and days. A future event date can be used instead of assuming the calculation is always for today.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
Leave as today to see current age. Change it for a future birthday or a form that asks “age on 1 Sept”.
How to use this tool
Check both dates, including any example values already present in the form. A date before birth cannot represent a valid elapsed age; choose a later as-of date.
Results and examples
A person born on 2000-06-15 has passed 26 birthdays by 2026-06-15. Whole years, remaining calendar months and days, and total elapsed days describe different quantities.
Limitations
- Legal, insurance, and eligibility rules may define age differently.
- The calculation does not add the traditional Korean counting-age increment.
Fields
| Field | Guidance and constraints |
|---|---|
| Date of birth | Check the unit and format displayed beside this field. |
| Age as of this date | Leave as today to see current age. Change it for a future birthday or a form that asks “age on 1 Sept”. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
What does an exact birthday comparison show?
A person born on 2000-06-15 has passed 26 birthdays by 2026-06-15. Whole years, remaining calendar months and days, and total elapsed days describe different quantities.
Does the result establish legal eligibility?
Legal, insurance, and eligibility rules may define age differently. The calculation does not add the traditional Korean counting-age increment.
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