Birthday Compatibility Calculator
Enter two birthdays and get zodiac compatibility plus numerology life-path readings — the full picture, free.
How it works
Birthday compatibility goes one layer deeper than sun-sign matching by combining two time-tested systems: Western astrology and numerology. Your birthday tells us your sun sign; the digits of your full birth date reveal your life path number — a core number in numerology that describes your innate drives, challenges and soul mission.
Our birthday calculator does both at once. First, it determines each person's zodiac sign from the month and day. Then it computes each person's life path number from the full birth date (summing year + month + day, reducing down to 1–9 or one of the master numbers 11, 22, 33). Finally, it pulls the full zodiac compatibility breakdown for the sign pairing.
Why does this matter? Two people with compatible zodiac signs but clashing life path numbers often feel attracted at first but struggle with long-term direction. Two people with matching life paths but "difficult" zodiac pairings tend to share deep purpose but clash over day-to-day style. Reading both gives you a far more complete picture.
Life path number 1s lead; 2s partner; 3s create; 4s build; 5s explore; 6s nurture; 7s analyze; 8s achieve; 9s serve. Master numbers (11, 22, 33) add intensity, vision and responsibility. When you understand both your signs and your life paths, relationship dynamics stop being mysterious.