Terms of Use

Last updated: October 2026

Using the calculator

Bonus Birthday is a free tool that calculates age milestones from a date of birth you enter. You may use it for personal, non-commercial purposes. Please do not attempt to overload, reverse-engineer or misuse the service.

No warranty

We calculate every milestone using real calendar days and elapsed time, and we handle leap years properly. However, the tool is provided "as is" without warranty of any kind. Always verify important dates independently — for example, by counting the days yourself or consulting a calendar.

Your data

Your date of birth and any optional information you enter stay in your browser. We do not store them on a server or include them in analytics. See our Privacy page for full details.

Intellectual property

The Bonus Birthday name, design and content are our original work. You are welcome to share your results and celebration cards; please do not copy the site or present it as your own.

Changes

We may update these terms from time to time. If we make a significant change, we will update the date above.