About Half Birthday Calculator

Half Birthday Calculator is a free, independent website built around one simple idea: finding your half birthday, and related date information, should be instant, accurate, and completely private.

We built this site after noticing that most half birthday tools online were either inaccurate around edge cases like leap years and month-length differences, or bundled with heavy ads and unnecessary sign-ups. Our goal was to build something faster, more accurate, and genuinely more useful, with a full toolkit of related calculators in one place.

What We Offer

• A precise half birthday calculator that correctly handles leap years and February 29 birthdays
• A full-featured age calculator
• A birthday countdown tool
• A general-purpose date difference calculator
• A day-of-birth (weekday) calculator
• An in-depth blog covering half birthdays, age calculations, and celebration ideas

Our Approach to Privacy

Every calculator on this site runs entirely in your web browser using JavaScript. The dates you enter are never transmitted to, or stored on, our servers. You can read the full details on our privacy policy page.

Questions or Feedback?

We'd love to hear from you. Visit our contact page to get in touch.