Multibirthday

🎂 When do you share a birthday?

Multibirthday finds the magical days when the sum of everyone's ages reaches a round number. Add up the ages of you and your loved ones – whenever the total lands on a round number (40, 50, 100 …), it's Multibirthday. A brand-new reason to celebrate that nobody else knows about.

✨ THE IDEA
Two people have two Multibirthdays a year, three people have three, and so on. The more of you there are, the more often you celebrate together. Separate birthdays become one shared event.

🎉 FEATURES
• Calculate shared birthdays for up to 5 people
• See your next Multibirthdays at a glance – with countdowns
• Reminders so you never miss a day 🔔
• Presets for couples, family, friends & colleagues
• Save as many groups as you like
• Share your Multibirthday with a link
• Celebrity examples to try instantly

⏱️ HOW IT WORKS
1. Enter names and birthdays
2. Tap "Calculate"
3. Discover your next shared celebrations

💞 PERFECT FOR
Couples and anniversaries, families, best friends, flatmates, teams and colleagues – for anyone who wants to share a special moment together.

🌟 TRY IT OUT
Load celebrity couples like Beyoncé & Jay-Z, William & Kate or the Obamas with one tap and see when they celebrate their next Multibirthday.

🌍 AVAILABLE IN 20 LANGUAGES
English, German, Spanish, French, Italian, Portuguese, Dutch, Polish, Turkish, Arabic, Hindi, Chinese (Simplified & Traditional), Japanese, Korean, Indonesian, Vietnamese, Thai and more.

❤️ Completely free – no ads, no sign-up, no account needed.

Download Multibirthday and find out when you'll next celebrate together!

Recent changes:
Minor updates and improvements. Thanks for using Multibirthday!