Birth date compatibility — CosmoMatch calculator

First person’s name (optional) Birth date — first person

Second person’s name (optional) Birth date — second person

Without signing up, you can calculate once, view the result and share it by link. Signing up unlocks saving and new comparisons

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This calculation uses birth dates — an honest but simplified perspective. Birth time and place make the picture more precise, and that deeper reading is available inside CosmoMatch. Percentages are an astrological interpretation, not scientific fact: use them as a reason to get to know each other better

Teen Deep: an in-depth pair reading

Switching language does not generate a reading. You can request another language separately without using another reading from your pack for the same pair.

Teen Deep is a warm, detailed reading of your pair: how you communicate, the energy you create together and your friendship, plus practical advice. Facts and percentages come from the free calculation above, while AI writes the text with care. For ages 14+. This is an astrological interpretation, not scientific fact or a verdict — relationships are built through conversation and respect.

How compatibility is calculated

The calculator determines the positions of the Sun, Moon, Venus and Mars for each date using Jean Meeus’s classical astronomy algorithms. It then compares aspects between the pair’s planets and the compatibility of their elements

Communication is assessed through the Sun, energy through Venus and Mars, and friendship through Venus and the Sun–Moon connection. Birth date calculation is deterministic and instant: the same pair of dates always gives the same result. Birth time and place make the picture more precise, and that deeper reading is available in the CosmoMatch app