Date & Time
Age Calculator
Compute exact age in years, months, and days from a birth date — plus total days lived and a countdown to the next birthday.
Feb 29 birthdays are celebrated on March 1 in non-leap years. Nothing you enter is stored or sent.
February 29 Birthdays
A leap-day birthday legally lands on March 1 in most non-leap years (jurisdictions differ — a few treat February 28 as the anniversary). The calculator states which convention it applies, so a "30 years, 6 months, 0 days" result is internally consistent rather than accidentally right.
The other common confusion is months: "6 months after August 31" is February 28 or March 2 depending on the library, because not every month has a 31st. Exact day counts are unambiguous; month-year breakdowns are conventions.
How the Dates Are Calculated
- Enter the birth date and, optionally, an "age at" date other than today.
- The tool computes the precise calendar age in years, months, and days.
- Totals are shown in months, weeks, and days lived.
- The next birthday countdown accounts for leap-day birthdays (celebrated Mar 1 in non-leap years).
Worked Example
Common Questions
How are February 29 birthdays counted?
In non-leap years, the birthday is treated as March 1 — the convention used by most jurisdictions.
Is any personal data stored?
No. The calculation runs entirely in your browser and nothing is sent or saved.
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Add or subtract days, weeks, months, or years from any date — with correct end-of-month clamping (Jan 31 + 1 month = Feb 28/29).
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