Free Age Calculator – Know Your Exact Age in Seconds
Our age calculator determines the precise difference between your date of birth and today. Unlike a simple subtraction, it correctly accounts for varying month lengths and leap years (366-day years), giving you an exact count of years, months, weeks, and days.
It's useful for filling in official forms, calculating eligibility for age-restricted services, tracking milestones like anniversaries, or just satisfying your curiosity. Everything runs in your browser — no data is ever sent to our servers.
How to Use the Age Calculator
01
Enter your birth date
Click the date field and select your date of birth, or type it directly in the format shown.
02
Click "Calculate Age"
Press the button (or the result updates automatically as you type) — no page reload needed.
03
Read your results
Your exact age in years, months, weeks and days is displayed instantly, plus your next birthday countdown.
Frequently Asked Questions
How accurate is this age calculator?
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Our age calculator is fully precise and accounts for leap years. It computes the exact number of years, months, weeks and days between your birth date and today's date using JavaScript's native Date object, which correctly handles all calendar edge cases including February 29th birthdays.
Can I enter a date in the future?
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No. This tool calculates age from a past date of birth to today. If you enter a future date, the calculator will display an error message. The date input field is also restricted to today's date as the maximum allowed value.
Does it count leap years correctly?
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Yes. The total days count accurately includes all leap years (366-day years) between your birth date and today. A leap year occurs every 4 years, except for years divisible by 100 but not by 400. All of this is handled automatically by the JavaScript Date object, ensuring a precise result every time.