Birthday Compatibility Calculator
Compare two birth dates by numerology: life path numbers, concord groups and a compatibility score.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
Numerological compatibility starts with the life path number of each person: the date of birth is reduced to a number from 1 to 9 or a master number, and the two results are compared. Traditional numerology sorts the nine numbers into three concord groups — the mental 1-5-7, the practical 2-4-8 and the creative 3-6-9 — and reads numbers from the same group as natural allies.
This calculator computes both life path numbers with the classic reduction, assigns each to its concord group and derives a match score from a fixed, transparent rule: same number and same group score highest, related groups land in the middle, and contrasting groups lower — with a small bonus when a master number 11, 22 or 33 is involved.
The result shows both numbers with their groups, the percentage and a short verdict on what such a pair is traditionally said to find easy and where friction usually appears.
Both dates stay in your browser — nothing is uploaded. And remember: low scores describe interesting couples, not doomed ones; numerology is a conversation starter, not a referee.
Example. 1990-01-01 (life path 3) and 1990-02-02 (life path 5) score 72%.
Limit. Scores are only the fixed concord table: 90 for the same reduced number, 85 for the same group, and 72, 66 or 60 across groups, plus 3 when a master number is present.