Age Calculator
Calculate exact age from date of birth with breakdowns by years, months, days, and upcoming birthday milestones.
Configure the reference window
All calculations happen instantly in the GMT+00:00
Pick the calendar date you were born.
Switch to a custom reference to plan for eligibility checks, anniversaries, or future milestones.
This tool follows deterministic calendar math so every result is reproducible:
- Chronological age is derived by subtracting the birth components from the reference and normalising seconds → minutes → hours → days → months → years. This honours real month lengths, leap years, and daylight saving shifts.
- Birthday projections rebuild the original month, day, and optional time in the current year. If that date does not exist (for example 29 February on a non-leap year) it rolls to the last valid day to keep the countdown accurate.
- Milestones are calculated by adding fixed day counts to the birth moment and comparing them to the reference. Everything runs in your browser, so no dates ever leave your device.
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