Everyday Tools
Age Calculator from Date of Birth
- Browser-based
- No signup
This age calculator from date of birth shows how old someone is on any date you choose—today, a past milestone, or a future event. Enter the birth date and optional calculation date to see years, months, days, and total days lived.
Age in years, months, and days counts complete calendar units—not fractional years. A baby born last month is 0 years, 1 month, not 0.08 years.
Use a consistent calculation date when comparing ages across a group (for example, school cutoff day or policy eligibility date).
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Your data never leaves your computer.
How to use this tool
Enter the date of birth, optionally change the calculation date from today, then calculate. Review years/months/days and total days.
Worked example
Example: born March 15, 1990, calculated on July 7, 2026 → 36 years, 3 months, and 23 days (plus total days lived).
When to use this
- Filling forms that ask for age on a specific date.
- Verifying eligibility for programs with age cutoffs.
- Planning milestone birthdays or anniversaries.
Common examples
- Born March 15, 1990 → age on July 7, 2026 is 36 years, 3 months, 23 days.
- School cutoff Sept 1 → compare two children's ages on that date for kindergarten eligibility.
- Retirement planning → age in years and months on a target retirement date.
- Birthday countdown → days until next birthday from today's date.
- Form entry → exact age in years, months, and days for insurance or travel paperwork.
What people search for
Common mistakes
- Swapping day and month in DD/MM versus MM/DD locales.
- Using timezone midnight when the birth time matters for same-day edge cases.
- Confusing total days with years × 365.
Related long-tail tasks
- age on a future date
- compare two people's ages
- days until next birthday
How it works
The age calculator counts complete years, months, and days between the date of birth and the calculation date. It also reports totals in months, weeks, and days. All math runs locally in your browser.
Limitations
Counts calendar years, months, and days between dates. Does not account for time zones or leap-second adjustments.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Related Age Calculator guides
These pages use the same age calculator with guides tailored to specific search intents.
Frequently asked questions
Does this account for leap years?
Yes. The calculator uses calendar dates, so February 29 and leap years are handled in the date math.
Can I calculate age as of a past date?
Yes. Set the calculation date to any day on or after the date of birth.
Is my date of birth sent to a server?
No. Standard processing runs locally in your browser.
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