Age Calculator
Free online calendar-aware Age Calculator. Determine exact age in years, months, and days, plus total months, weeks, days, and hours lived. Handles leap years, Feb 29 birthdays, and displays days remaining until your next birthday. 100% private and runs locally in your browser.
Your files never leave your device. All processing happens on your device. No uploads, ever.
How to use Age Calculator
- 1
Select Date of Birth
Pick your birth date from the calendar picker.
- 2
Choose Target Date
Keep today's date or select a custom date to calculate your age on.
- 3
View Age Breakdown
Instantly see years, months, days, total weeks/days, and next birthday countdown.
Calendar-Aware Exact Age Calculation
Unlike simplistic calculators that assume 365 days every year or 30 days every month, our engine calculates age using actual calendar month lengths and leap years. You get 100% precise results.
Next Birthday Countdown & Lifetime Totals
In addition to your age in years/months/days, view total breakdown in months, weeks, days, hours, and the exact day of the week for your upcoming birthday.
Frequently asked questions
How is exact age calculated with different month lengths?
The calculator steps back from the target date month-by-month using actual calendar days per month (28, 29, 30, or 31) and accounts for leap years.
How does the calculator handle February 29 leap year birthdays?
In non-leap years, February 29 birthdays are calculated as turning a year older on February 28 or March 1, maintaining exact calendar accuracy.
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Last updated 10 August 2026