Free Online Age Calculator – Find Your Exact Age

Instantly calculate your exact age in years, months, days, hours, and minutes. Our advanced age calculator is accurate, leap year–ready, and mobile-friendly — perfect for quick date of birth checks and birthday countdowns.

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Age Calculator

Date of Birth
Age at the Date of

Results

Years, Months, Days

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Total Months, Days

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Total Days

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Total Hours

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Total Minutes

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Total Seconds

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Weekday of Birth

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Next Birthday

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Free Online Age Calculator – Complete Guide to Exact Age Calculation

Learn what an age calculator is, how it works, and why exact age (years, months, days, hours, minutes, and seconds) matters for forms, planning, and more.

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What Is an Age Calculator?

An Age Calculator determines your precise age from your date of birth to a chosen date (usually today). Our tool returns years, months, days, hours, minutes, and seconds, plus your weekday of birth and a next birthday countdown.

Key Features

  • Leap-year aware and month-length accurate
  • Detailed totals: days, hours, minutes, seconds
  • Next birthday date, days left, and age turning
  • Clean, mobile-first design with accessibility built-in
  • Choose any “age as of” date—past or future

How to Use the Age Calculator

  1. Enter your date of birth (month, day, year).
  2. Select the calculation date or tick Use today’s date.
  3. Click Calculate Age to view the full breakdown.
  4. Use Reset to clear fields and try again.

Why Use an Online Age Calculator?

Manual date math is error-prone—especially across months of different lengths and leap years. Our calculator applies robust date-time logic, saving you time and preventing mistakes.

Accuracy & Reliability

The calculator handles leap years and calendar edge cases. Totals are computed in UTC to avoid daylight-saving pitfalls. We continually test common and rare inputs (e.g., Feb 29 birthdays) to maintain accuracy.

Age Calculator – Frequently Asked Questions

Quick answers about accuracy, leap years, privacy, and how to use the calculator. All FAQs are opened by default for easy scanning.

How do I use the Age Calculator?

Enter your date of birth (month, day, year). Choose “Use today’s date” or select a custom date in “Age at the Date of,” then click Calculate Age. You’ll see years, months, days, plus totals in hours, minutes, and seconds.

Open the Age Calculator

Does it handle leap years and Feb-29 birthdays?

Yes. The calculator accounts for leap years and varying month lengths. For Feb-29 birthdays, it uses Feb-29 on leap years and adjusts appropriately on non-leap years.

Can I calculate age for a past or future date?

Absolutely. Set a custom date in the “Age at the Date of” fields. The tool computes from your date of birth to that chosen date.

How accurate are totals like days, hours, and minutes?

Totals are calculated using UTC day boundaries to avoid daylight-saving time issues. This produces consistent results across time zones.

Do you store any of my data?

No. All calculations run locally in your browser. We don’t store or transmit your dates.

Why do I get “Day must be 1–28/29/30/31” errors?

That message appears when the day is invalid for the selected month/year (for example, trying to use the 31st in a 30-day month, or Feb-30). Adjust the day to match the month length.

Can I see the weekday of birth and next birthday?

Yes. Results include your weekday of birth and a next-birthday countdown with the date and how many days are left.