±Free
Age calculator
Calculate completed years of age between two dates.
Calculate completed years of age between a start date and an end date, together with the elapsed number of days. The year count increases only when the month and day of the start date have been reached in the end year.
How to use
- Enter the birth date or other start date.
- Enter an end date that is on or after the start date.
- Run the tool to read completed years and elapsed days.
Worked example
Example input
Start: 2000-01-01 End: 2026-01-01
Example result
Age: 26 Days: 9,497
Limitations and details
Dates are interpreted at midnight UTC without time-of-day or timezone adjustments. The day total excludes the start day. For a February 29 start date, completed years increase on March 1 in a non-leap year; legal birthday conventions may differ.
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.