Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find your next birthday countdown instantly.
Free Age Calculator — How Old Am I?
The SmarterSources Age Calculator instantly computes your exact age down to the day, plus totals in months, weeks, days, and hours. It also tells you the day of the week you were born, how many days until your next birthday, and your zodiac sign. Everything runs in your browser with no data sent anywhere.
How the Age Calculator Works
Enter your date of birth and an optional "as of" date (which defaults to today). The calculator uses precise calendar math to determine the number of full years, months, and remaining days between the two dates. It then converts the entire span into total months, weeks, days, and hours so you can see your age expressed in multiple units at a glance.
Leap Year Handling
The calculator correctly accounts for leap years. If you were born on February 29, it still calculates your age accurately. Total day and hour counts include every leap day that falls within your lifespan.
Next Birthday Countdown
The calculator determines the date of your next birthday relative to the "as of" date and tells you how many days away it is, along with which day of the week it falls on. This is useful for planning celebrations or simply satisfying your curiosity.
Zodiac Sign Lookup
Based on your birth month and day, the calculator shows your Western zodiac sign. This is a fun bonus feature that uses the standard astrological date ranges for all 12 zodiac signs.
Frequently Asked Questions
How do I calculate my exact age?
Enter your date of birth into the calculator above. It will instantly show your age in years, months, and days, along with totals in other units. You can also change the "Calculate As Of" date to find your age on any specific date.
Does the calculator handle leap years?
Yes. The calculator uses JavaScript Date objects which correctly handle leap years, including February 29 birthdays. All total counts (days, hours) include leap days that fall within the date range.
Can I calculate age between two arbitrary dates?
Yes. The "Calculate As Of" field defaults to today but you can set it to any date, past or future. This lets you find out how old you were or will be on a specific date.
How is total days calculated?
Total days is the absolute number of calendar days between your date of birth and the target date. The calculator divides the difference in milliseconds by 86,400,000 (the number of milliseconds in one day) and rounds down.
What zodiac sign does the calculator show?
The calculator shows your Western zodiac sign based on your birth month and day. It covers all 12 signs using the standard date ranges, from Capricorn (Dec 22 - Jan 19) through Sagittarius (Nov 22 - Dec 21).
Is my data private?
Absolutely. This calculator runs entirely in your browser. No dates are sent to any server, no cookies are set, and nothing is stored. Your information remains completely private.