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Home / Calculators / Age Calculator

Free Age Calculator

Calculate your exact age in years, months, days, hours, minutes, and seconds — instantly and privately.

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Please select a valid date of birth.
Live age ticking — watch your age update in real time!
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Years
0
Months
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Days
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Hours
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Minutes
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Seconds
Age Breakdown
Total Months 0
Total Weeks 0
Total Days 0
Total Hours 0
Total Minutes 0
Total Seconds 0
Your next birthday is in 0 days.

How to Use the Age Calculator

1

Enter Date & Time of Birth

Select your date and time of birth using the date picker and time fields.

2

Choose Reference Date & Time

Use the current time or pick any date/time for age calculation.

3

Calculate or Go Live!

Click "Calculate Age" or hit "Live Age" to see your age tick in real time.

About This Age Calculator Tool

Our free online Age Calculator lets you calculate your exact age down to the second. Whether you need to know your age in years, months, and days for official forms, or you're just curious about how many seconds you've been alive, this tool gives you precise, instant results. If you're expecting, try our Due Date Calculator for your estimated delivery date.

All calculations are performed entirely in your browser using JavaScript's Date API. Your data never leaves your device, and no information is stored or tracked. This tool is 100% free with no limits, sign-ups, or ads.

The age calculation accounts for leap years, varying month lengths (28–31 days), and timezone differences to provide accurate results for any date range — past, present, or future.

Frequently Asked Questions

Simply enter your date of birth in the Date of Birth field, choose an As of Date (defaults to today), and click Calculate Age. The tool instantly displays your age in years, months, days, hours, minutes, and seconds. It also shows total months, weeks, days, hours, minutes, and seconds, plus a countdown to your next birthday.

Yes, it is completely free. There are no hidden fees, subscription plans, or usage limits. You can use it as many times as you like, for any purpose — personal, educational, or professional. We believe essential tools should be accessible to everyone.

No, absolutely not. Your date of birth and all calculations are processed entirely on your device using client-side JavaScript. No data is sent to any server, stored in cookies, or tracked in any way. Your privacy is fully protected — this is a core principle of FreeNestTools.

The calculator computes the precise difference between two dates by comparing their year, month, day, hour, minute, and second components. It handles:
  • Leap years (February 29 is properly recognized)
  • Variable month lengths (28–31 days per month)
  • Date boundaries (borrowing days/months when subtracting dates)
The result is the exact chronological age, not a rounded or estimated value.

Yes. The As of Date field defaults to today, but you can change it to any date — past or future. This is useful for calculating someone's age on a specific historical date (e.g., at the time of an event) or how old they will be on a future date.

Yes. The tool correctly handles February 29 birthdays. In non-leap years, the calculation treats February 28 as the equivalent date for age progression. The JavaScript Date object and our logic both account for leap years automatically, ensuring accurate results.

Absolutely. The tool is fully responsive and works on all devices — desktops, laptops, tablets, and smartphones. The layout adapts to your screen size for a comfortable experience on any device.

Chronological age is the exact time elapsed since your birth — measured in years, months, days, etc. This is what our calculator computes. Biological age estimates how well your body functions compared to your chronological age based on lifestyle, genetics, and health markers. This tool calculates chronological age only. For a health-focused assessment, try our BMI Calculator.

Total breakdowns are useful in many scenarios:
  • Medical contexts: Doctors may track age in total months for infants
  • Insurance & legal: Some forms require age in exact days
  • Fun & curiosity: Knowing your total seconds alive is a fun conversation starter
  • Milestone tracking: Count down to 1 billion seconds (around age 31.7 years)

The tool requires an internet connection to load the page (including Bootstrap and Google Fonts). However, once the page is loaded, all age calculations are performed locally on your device and do not require further internet connectivity. For full offline use, you can save the page in your browser.