Age Calculator
Results
Date Information
Age in Other Units
Tips
• Calculate your exact age by setting the target date to today
• See how old you'll be on a future date by changing the target date
• See how old someone was on a historical date by setting an earlier target date
• Click the copy button to copy the complete age details to your clipboard
Related Tools
What is an Age Calculator?
An age calculator is a specialized tool designed to determine the exact duration between two dates, most commonly used to calculate a person's precise age based on their birth date. Unlike simple year calculations, a proper age calculator accounts for varying month lengths, leap years, and provides a comprehensive breakdown of the time elapsed in years, months, and days.
Our free online age calculator offers a simple and intuitive interface to find the exact time difference between any two dates. The calculator automatically defaults to using today's date as the end date when calculating age from a birth date, but you can also specify a different end date if needed.
Beyond personal age calculations, this tool is valuable for determining precise time periods for legal documents, developmental milestones, contract durations, and any situation where an accurate measure of elapsed time is required. The results are displayed instantly in a clear format showing years, months, and days, giving you a complete picture of the time span.
Common Uses for an Age Calculator
Personal Age Calculations
Calculate your exact age or the ages of family members for personal knowledge, milestone celebrations, or curiosity. Many people enjoy knowing their precise age in years, months, and days, especially when approaching significant birthdays or anniversaries.
Healthcare and Development
Determine a child's exact age for developmental assessments, growth charts, or vaccine schedules. Healthcare providers often need precise age calculations in months and days, particularly for infants and young children, to evaluate development against standard milestones.
Legal and Administrative Purposes
Calculate ages for legal documents, eligibility verification for age-restricted services, retirement planning, or insurance policies. Many legal and administrative processes require precise age verification, and our calculator provides accurate results that account for all calendar irregularities.
Education and Enrollment
Determine a child's exact age for school enrollment, grade placement, or eligibility for educational programs. Many educational institutions have specific age requirements with cutoff dates, and an accurate age calculator helps parents and administrators make appropriate decisions.
Frequently Asked Questions
How does the age calculator determine months and days?
Our age calculator uses a precise algorithm that accounts for the varying lengths of months and leap years to calculate the exact duration between two dates. When determining months, the calculator considers the actual number of days in each month rather than using a fixed 30-day month. For example, if you were born on January 15 and today is March 20 of the same year, the calculator would show 2 months and 5 days, properly accounting for February's shorter length. This approach ensures accuracy in all calculations, regardless of which months are involved or whether leap years occur in the timespan.
Can I calculate age between any two dates, not just from birth to today?
Yes, our age calculator can determine the time span between any two dates you specify, not just from a birth date to the current date. While the default end date is set to today for convenience in birth date calculations, you can easily change both the start and end dates to any dates you need. This flexibility makes the tool useful for calculating contract durations, time in a position or role, time remaining until a future event, or any other scenario where you need to know the precise duration between two points in time.
How does the calculator handle leap years?
Our age calculator properly accounts for leap years in all calculations, ensuring accuracy regardless of the date range. The calculator follows the standard leap year rules (years divisible by 4 are leap years, except years divisible by 100 but not by 400) to determine if February has 28 or 29 days in any given year. This is particularly important for people born on February 29, whose birthdays only occur every four years. When calculating age for someone born on a leap day in a non-leap year, the calculator appropriately handles this edge case, typically considering February 28 as the anniversary in non-leap years.
Is the age calculation accurate for very old birth dates?
Yes, our age calculator maintains accuracy even for very old birth dates, but it's important to note that it uses the Gregorian calendar system which was adopted at different times in different regions. For dates prior to a country's adoption of the Gregorian calendar (which occurred primarily in the 16th-20th centuries), there might be some discrepancies due to the calendar system change. The calculator also handles birth dates from centuries ago, so you can use it for historical research, genealogy, or calculating ages of historical figures. The algorithm properly accounts for all leap years and century rules throughout the supported date range.
Can I see my age in other units besides years, months, and days?
Our age calculator primarily displays results in the standard format of years, months, and days, as this is the most practical and commonly used representation. However, the tool also calculates and shows your total age in days, which can be useful for certain applications. If you need your age in other units like weeks, hours, minutes, or seconds, you can derive these from the total days by applying the appropriate conversion factors (multiply days by 7 for weeks, by 24 for hours, by 1440 for minutes, or by 86400 for seconds). For most practical purposes though, the years, months, and days format provides the most intuitive understanding of age or time elapsed.