Age Calculator | Full age from date of birth
Calculate full age from your date of birth in your browser, plus Japanese era names, a simple year-based zodiac animal, a star sign from month and day, child-style month counts under six, day-count milestones, days until a chosen adulthood age (18 or 20), and a multi-person table with copyable text. Nothing is sent to a server.
Enter your date of birth and a reference date to see results.
Multiple people
Only rows with a date of birth are calculated.
Names are optional—you can leave them blank.
| Name | Date of birth | Age | Details | Next birthday |
|---|
What you can do with Age Calculator
- Enter a date of birth and reference date to see full age, a year/month/day breakdown, days since birth, and days until the next birthday.
- See key dates with Japanese era labels where supported, plus zodiac animal and star sign.
- Review day-count milestones, month-based details for children under six, and days until age 18 or 20 on the same results screen.
- Use the Multiple people tab to compare up to 20 people against one shared reference date.
How to use
- On the One person tab, enter a date of birth and reference date. The reference date defaults to today.
- Choose age 18 or 20 when you want the adulthood countdown.
- On the Multiple people tab, enter the shared reference date plus optional names and birth dates.
- Use the copy buttons when you want a shareable text summary or list.
How to read the results
On the One person tab, full age is shown prominently, followed by a year/month/day breakdown, days since birth, days until the next birthday, and Japanese era, zodiac, and star sign where available.
For example, born May 10, 1995 with reference May 6, 2026 shows 30; with reference May 10, 2026 it shows 31.
On the Multiple people tab, everyone’s age is listed at the same reference date. You can copy one row or the full list.
Ways to use it
Check today's age
Enter a date of birth to see your full age as of today without manual counting.
Forms and applications
Confirm full age before filling out resumes, applications, or other documents that require an exact age.
Age on a past or future date
Change the reference date to calculate how old someone was or will be on a specific calendar day.
Days until the next birthday
See how many days remain until the next birthday when planning events or reminders.
Japanese era alongside Western dates
Review Japanese era labels together with Western dates when preparing forms or written records.
Child month counts and milestones
Check month-based details for children under six and upcoming day-count milestones after birth.
Days until age 18 or 20
Choose 18 or 20 to see the target date and remaining days until that adulthood milestone.
Compare several people on the same date
Use the Multiple people tab to list ages for up to 20 people at one shared reference date.
How input data is handled
- Age is calculated in full years. Change the reference date to see age on a specific calendar day.
- Dates are handled as local calendar dates without time-of-day shifts.
- If you were born on February 29, February 28 is used as your birthday in non-leap years.
- Weeks use floor division by 7; the calendar year-month-day span since birth is shown for clarity.
- The zodiac animal uses the Gregorian year only, not a strict lunar-calendar rule set. The star sign uses popular month-day ranges.
- Legal definitions of adulthood vary by country and context. Adulthood countdowns are practical estimates, not legal advice.
- Dates, names, and reference values are processed only in your browser and are not sent to a server. Names are optional.
FAQ
- Can I calculate full age as of today or another date?
- Yes. The reference date defaults to today, and changing it calculates full age as of that calendar date.
- What if I was born on February 29?
- In non-leap years, February 28 is treated as your birthday.
- Can I see Japanese era, zodiac, and star sign?
- Yes. Dates can be shown with Japanese era labels where supported. The zodiac uses the Gregorian birth year, and the star sign uses common month-day ranges.
- Can I see month age or milestones?
- Yes. For ages under six, month-based details are shown. The tool also shows the next day-count milestone based on days since birth.
- Can I see days until adulthood?
- Yes. Choose 18 or 20 and see the target date and remaining days.
- Can I calculate ages for several people?
- Yes. Enter optional names and birth dates and compare everyone at the same reference date.
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