Age Calculator
Precise Age Calculator Dashboard
Enter a birth date and your age-at the Date to see an age breakdown in calendar years, months, days, hours, minutes, and seconds. The age calculator also surfaces the exact countdown to the next birthday so planning milestones stays simple.
Date of Birth
Provide the calendar date of birth for the most accurate age.
Age at the Date of
Use today or project to a future milestone to preview your exact age.
Age Calculation Result
Years
0
Months
0
Days
0
Age in different time units
Total days
0
Total hours
0
Total minutes
0
Total seconds
0
Next birthday
·
What This Calculator Does
This tool calculates the time between a birth date and an age-at the Date . It reports age as a calendar-style breakdown (years, months, days) and also as totals (days, hours, minutes, seconds).
An exact age in years, months, and days is commonly used for school cutoff dates, benefit eligibility, medical records, and other age verification checks. Calculations run in your browser using your local time zone.
How Inputs Affect the Result
Small changes in dates can change the result, especially around midnight.
- Enter the date of birth.
- Enter the age-at the Date . It starts at the current date, but you can set any past or future date.
- The age-at the Date must be the same as or after the birth date. If it's earlier, the calculator shows an error.
Use the copy buttons if you need to paste results into a form, a spreadsheet, or a note.
What the Results Mean
- Calendar age: Years, months, and days, based on the calendar (months can be 28 to 31 days).
- Time totals: Total days, hours, minutes, and seconds between the two dates, shown as whole numbers.
- Dates: A copyable birth and age-at the Date , helpful when documenting an age on a specific date.
- Next birthday: The next birthday date and the time remaining until it.
For practical checks like eligibility cutoffs, the calendar age is usually what you want. Totals are useful when a process asks for age in days or hours.
Common Use Cases
People often use an exact age calculator for HR paperwork, school enrollment, healthcare scheduling, and record keeping.
- HR and payroll: Age verification for benefits, dependents, or retirement rules.
- Schools and programs: Checking age cutoffs for enrollment, activities, or scholarships.
- Healthcare: Tracking pediatric age in days/weeks or scheduling age-based screenings.
- Sports and recreation: Eligibility for age brackets and league rules.
- Records and research: Documenting lifespans for genealogy, biographies, or legal files.
If you need to report an age in years, months, and days, the calendar breakdown is the section most forms expect.
How Dates Are Compared
The calculator first counts full calendar years between the two dates. Then it counts full months. The remaining difference is shown as days, hours, minutes, and seconds.
Total days, hours, minutes, and seconds come from the exact elapsed time between the two dates. Leap years and daylight saving time changes are handled by your browser's date and time rules.
Working Backward From Age
If you know someone's age and the reference date but not the birthday, the Date of Birth Finder works in the opposite direction.
FAQs
Does this match legal or policy definitions of age?
It reports age as full calendar years first, then months and days, which is how many policies describe age. Definitions can vary, so if you are using this for a legal requirement, follow the wording of the specific policy.
How are leap years and February 29 birthdays handled?
Leap days are included in the elapsed totals when they fall between the two dates. For a February 29 birthday, the next birthday date may roll into March in non-leap years, depending on your browser's date rules.
Why don't total days match the calendar breakdown?
The calendar breakdown counts whole years and whole months first, then shows what's left as days and time. Total days and hours are based on elapsed time between the two dates, so they won't line up with a fixed "30 days per month" idea.
Which time zone does it use?
It uses your browser's local time zone when building the birth and age-at the Date s. If you are comparing dates recorded in a different time zone, convert both to the same time zone first.