📅 Age Calculator
Quickly calculate your exact age in years, months, and days with our free, easy-to-use Age Calculator. Get accurate results down to the minute, discover fun age facts, and find out when your next birthday is.
How to Use This Age Calculator
How to Calculate Your Age:
- Enter your birth date using the date picker
- Optionally change the "Calculate Age On" date (defaults to today)
- Choose your preferred display format (detailed, years only, etc.)
- For precision, check "Include Time of Birth" and enter your birth time
- Your age will calculate automatically as you type
Pro Tips: Use "Calculate Age On" to find out how old you'll be on a future date, or how old you were on a past date. Include birth time for calculations accurate to the minute!
How It Works
The Math Behind Age Calculation:
Age calculation involves careful handling of calendar irregularities. Here's how to do it by hand:
- Start with years: Target year - Birth year
- Check the month: If target month < birth month, subtract 1 year and add 12 to month difference
- Check the day: If target day < birth day, subtract 1 month and add days from previous month
- Handle leap years: February has 29 days in leap years (divisible by 4, except centuries unless divisible by 400)
Example: Born March 15, 1990, calculating age on January 10, 2025:
- Years: 2025 - 1990 = 35, but January < March, so 34 years
- Months: 12 + (1 - 3) = 10 months
- Days: 10 - 15 = -5, so 31 + (-5) = 26 days from December
- Result: 34 years, 9 months, 26 days
When You Might Need This
- • Calculate exact age for birthday milestone planning
- • Determine age for social media profiles and dating apps
- • Track aging for personal health and fitness goals
- • Verify employee age for benefits eligibility
- • Calculate client ages for insurance premium assessments
Frequently Asked Questions
How accurate are the age calculations?
Our calculator accounts for leap years and varying month lengths, providing precise calculations down to the day. When time of birth is included, accuracy extends to hours and minutes.
Can I calculate future ages or past ages on specific dates?
Yes, you can set any target date to calculate what your age was or will be on that specific date. This is useful for planning purposes and historical documentation.
Does this tool store my data?
No. All calculations happen in your browser and no data is sent to our servers. Your privacy is protected and no personal information is collected or stored.