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Birthday Calculator
Discover what day of the week you were born, your birth number, next birthday countdown, and upcoming birthdays for any date.
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Frequently Asked Questions
Birthday Calculator is a free online tool that helps you discover what day of the week you were born, your birth number, next birthday countdown, and upcoming birthdays for any date. It runs entirely in your browser — no sign-up or installation required.
Yes, Birthday Calculator is completely free. There are no hidden charges, subscriptions, or account requirements. You can use it as many times as you like.
Birthday Calculator uses industry-standard algorithms and formulas to ensure accurate results. All calculations are performed locally in your browser for speed and privacy. If you spot an issue, please let us know via the Contact page.