Practical tools for measured work
Age calculator
Calculate calendar age on an explicit date in years, months and days.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
How it works
Choose a birth date and an explicit comparison date. Count completed years, then completed calendar months, then remaining days. An anniversary beyond the end of a month is clamped to that month’s last day; 29 February uses 28 February in a non-leap year.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Birth date
- 2000-02-29
- Age on date
- 2024-03-01
Primary result: Completed years: 24.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
This calendar convention is not a legal age determination. Jurisdictions may treat leap-day birthdays differently. The comparison date must not precede the birth date.
Frequently asked questions
Does the comparison date update automatically?
No. Set Age on date explicitly so saved and shared calculations remain reproducible.
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