Enter a birth date and an "as of" date; the exact age and total days lived update as you change either field.
Change either date at any time and the age and total-days figures recalculate immediately - there is no separate "calculate" button to press.
If the birth date is missing or falls after the "as of" date, the tool shows a prompt to fix it instead of a wrong or negative result.
Age Calculator
Work out an exact age in years, months, and days from a birth date.
Use it to check an exact age for a form, an eligibility cutoff, or just out of curiosity.
The "as of" field defaults to today's date, but you can pick any date to check age as of that day.
The calculation runs locally in the browser - no upload and no account.
Does not provide medical or financial advice - results are general estimates only.
Not sure this is the right fit for what you need right now? See when to use the age calculator.
Frequently Asked Questions
What does Age Calculator do?
Work out an exact age in years, months, and days from a birth date.
When should I reach for age calculator?
Use it to check an exact age for a form, an eligibility cutoff, or just out of curiosity.
What complementary tools work well alongside age calculator?
Defaults to today's date for the "as of" field, but you can pick any date to check age as of that day.