Age Calculator Inputs
Formula Used
Calendar age uses the exact difference between two dates. Years, months, and days remain calendar-aware. Leap years are handled automatically.
Exact age = Calculation date − Birth date Total days = Elapsed seconds ÷ 86,400 Average fractional age = Total days ÷ 365.2425 Age gap = Later birth date − Earlier birth date
How to Use
- Select an age calculation mode.
- Enter the required dates and optional times.
- Choose display, precision, and leap-day settings.
- Press Calculate Age to view the result.
- Copy, print, share, or export the calculation.
Example Data
| Birth date | Calculation date | Example result |
|---|---|---|
| 15 June 1990 | 15 June 2026 | 36 years |
| 29 February 2000 | 28 February 2026 | 25 or 26 years by selected rule |
| 1 January 2010 | 27 July 2026 | 16 years, 6 months, 26 days |
Frequently Asked Questions
How is exact age calculated?
The calculator compares calendar dates in the selected timezone. It separates completed years, months, and days. This avoids rough year-length assumptions.
Can I calculate age on a future date?
Yes. Enter any valid future calculation date. The result shows age on that date.
How are leap-day birthdays handled?
You may use 28 February or 1 March. This choice affects non-leap-year birthday dates. Leap years still use 29 February.
What does fractional age mean?
Fractional age expresses age as a decimal number. Average-year mode divides days by 365.2425. Calendar mode uses calendar components.
Can the calculator compare two people?
Yes. Select the comparison mode and enter both birthdays. The tool reports the complete age gap.
Does time of birth matter?
It matters for hour, minute, and second totals. It also improves birthday countdown accuracy. Midnight is used when omitted.
What is the retirement date result?
The calculator adds your selected retirement age. It provides a planning date only. Official rules may differ by country.
Are my dates stored?
No database storage is used in this file. Calculations occur during the current request. Exporting remains under your control.
Why can total months differ from calendar months?
Total months use an average month length. Calendar months follow actual date boundaries. Both values answer different questions.