Age Calculator
Calculate your exact age in years, months, and days from your date of birth. Find your age on any date, discover how many days you have lived, and check the date of your next birthday.
Calculate Your Exact Age
Enter your birth date and choose the date you want to calculate your age for.
Your Calculation
Your Age Details
How to Use the Age Calculator
This free age calculator helps you calculate age by date of birth and determine how old someone was or will be on a particular date.
- Enter your date of birth in the first date field.
- Select today's date or another date in the “Age at Date” field.
- Click “Calculate Age” to see your age in years, months, and days, along with your total days lived and birthday information.
You can calculate your current age, check your age on a historical date, or calculate your projected age on a future date.
How Is Age Calculated?
Chronological age measures the time between a date of birth and a selected reference date. It is commonly expressed as completed years, followed by completed months and remaining days.
Simply subtracting the birth year from the current year does not always give the correct age. The birthday must also be considered, and calendar months contain different numbers of days. This calculator therefore uses calendar arithmetic instead of approximating every year as 365 days.
Leap Years and February 29 Birthdays
A leap year has 366 days and includes February 29. For this calculator, someone born on February 29 has a February 28 anniversary in a non-leap year. In a leap year, the anniversary remains February 29. Legal or official age rules may use a different convention.
How Month-End Dates Work
Because months have different lengths, a monthly anniversary can fall on the last day of a shorter month. For example, this calculator treats January 31's monthly anniversary in February as the last day of February. It applies this rule consistently when calculating completed months and remaining days.
What Can You Calculate With This Tool?
- Current age: Calculate your age as of today's date.
- Age on a past date: Find your age on a historical date, such as the day of an event.
- Age on a future date: Find your projected age on a date in the future.
- Total days and weeks: See the elapsed calendar days and completed weeks between two dates.
- Birthday countdown: Check the next birthday on or after your chosen reference date.
- General age checks: Help prepare for school applications, university forms, and other age-related planning.
For admissions, government applications, employment, travel, benefits, or other official purposes, verify the applicable institution's rules, jurisdiction, and age cutoff date. This calculator provides a chronological age calculation, not a legal determination of eligibility.
Example of Age Calculation
Date of birth: January 15, 2000
Age calculated as of: March 20, 2024
Exact age: 24 years, 2 months, and 5 days
From January 15, 2000, to January 15, 2024, 24 full years have elapsed. From January 15 to March 15, another 2 full calendar months have elapsed. March 15 to March 20 adds 5 days.
Frequently Asked Questions
1. How do I calculate my exact age from my date of birth?
Enter your birth date, select the date you want to calculate your age for, and click “Calculate Age.” The calculator returns completed years, months, and remaining days using calendar arithmetic.
2. Can I calculate my age on a past or future date?
Yes. Change the “Age at Date” field to any valid reference date on or after the birth date. The result represents your age on that specific date, not necessarily your current age.
3. How does the calculator handle leap years?
It accounts for February 29 in leap years. For a February 29 birthday, February 28 is used as the anniversary in non-leap years. Official rules can vary depending on the purpose and location.
4. What is the difference between completed age and exact age?
Completed age usually refers to the number of full years elapsed. An exact age breakdown adds the completed months and remaining days since the last applicable anniversary.
5. Can I calculate my age in total days and months?
Yes. The results show total elapsed calendar days, completed weeks, and completed months of age. Total completed months equal the completed years multiplied by 12, plus the additional completed months.
6. Does this calculator store my date of birth?
The calculator code performs calculations in your browser and does not submit the entered dates to an external calculation service. The tool itself does not store these dates in browser storage. Your website's general hosting or security infrastructure may operate independently of this widget.
7. Can I use this calculator for official age eligibility?
You can use it to check your chronological age. However, official eligibility may depend on a specific cutoff date or legal definition. Always verify the rules of the relevant organization or authority.
8. Why can different age calculators give different results?
Calculators may use different conventions for February 29 birthdays, month-end anniversaries, or the treatment of the reference date. This tool uses the conventions described above to produce a consistent result.
9. Which calendar does this calculator use?
It uses Gregorian calendar dates, the standard calendar used by the native browser date input. It does not convert dates from lunar, Hijri, Hebrew, or other non-Gregorian calendars.
10. How do I calculate the days until my next birthday?
Calculate your age and read the birthday countdown in the results. It shows the number of calendar days from the selected reference date to the next birthday on or after that date. If the reference date is the birthday itself, the countdown is zero.
Today Festival's Age Calculator uses Gregorian calendar dates and date-only calculations. Results are intended for general informational purposes. Official age definitions and eligibility requirements may vary.