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Age Calculator

A premium Date & Time Intelligence Suite that calculates your exact age down to the second, your next birthday countdown, educational life statistics, and special milestones like 10,000 days or 1 billion seconds. Compare any two dates with business days and weekend breakdowns, or count down to a wedding, exam, vacation, or retirement. Everything runs entirely in your browser — your dates never leave your device.

Calculator Mode

Time of Birth (optional)

Reference Date

🔒 All calculations happen entirely in your browser. Your dates are never uploaded or stored on our servers.

Frequently Asked Questions

Everything you need to know about calculating your exact age

How is my exact age calculated?
We compare your date of birth with the reference date (today by default) down to the second. The calendar breakdown (years, months, days) uses precise date arithmetic that handles month lengths and leap years, while the totals (days, hours, minutes, seconds) are computed from the exact millisecond difference.
What happens if I was born on 29 February?
Leap-day birthdays are handled correctly. In non-leap years your birthday is treated as 28 February for calendar arithmetic, and your next-birthday countdown will show the celebration date as either 28 February or 29 February depending on the year.
Are the life statistics (heartbeats, steps, etc.) accurate?
No — they are educational estimates only. We use common population averages (about 72 heartbeats per minute, 16 breaths per minute, 8 hours of sleep, and 7,500 steps per day). Real values vary hugely per person, which is why every estimate is clearly labelled as approximate.
Do my dates get uploaded anywhere?
No. Every calculation happens entirely in your browser using JavaScript. Your date of birth and reference dates are never uploaded, stored on a server, or shared. Recent calculations are saved only to your own device's local storage so you can pick them up later.
Why is my age different on another website?
Different calculators round differently. Some show just the calendar breakdown (e.g. 27 years, 4 months, 2 days), while others show cumulative totals. We show both, plus the exact totals in days, hours, minutes, and seconds so you always know precisely how old you are.
What is a business day and how is it counted?
A business day is Monday through Friday. When you use Date Difference mode we count every weekday between the two dates (both ends included) and separately show weekends, so you can plan around working days.

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