By your zodiac signs
Friendship Calculator
Your two signs, one friendship score. Then send it to your friend.
Your birthday
The year is optional: a sun sign only needs the day and the month.
Your friend’s birthday
The year is optional: a sun sign only needs the day and the month.
Birthdays never leave your browser. Nothing is saved or sent.
How the friendship calculator works
It finds each person’s Western sun sign from the birthday (or the sign you pick), then scores the pair from their elements, their modalities and the angle between the signs. Only the day and the month matter, and the same two signs always give the same score, in either order.
Just for fun
Astrology is a tradition, not a science, and a sun sign is only one small part of a chart. Real friendship is made of time, trust and showing up, so treat the score as a playful number to share.
Friendship calculator questions
How does the friendship calculator work?
It finds each person’s sun sign from the birthday (or the sign you pick) and scores the pair from their elements, modalities and the angle between the signs. The same two signs always give the same score, in either order.
Is the friendship calculator accurate?
No, it’s for fun. Astrology is a tradition, not a science, and a sign can’t measure a friendship. Treat the score as a playful number to share.
Do you store my birthday?
No. Everything runs in your browser. The birthdays are not sent anywhere, not saved and not put in the page address.