What does a 70% face similarity score actually mean?

A percentage looks precise, so it is easy to give it more meaning than it deserves. A 70% face-similarity result should be read as a score produced by a particular comparison method — not as “70% related,” “70% the same person,” or “70% genetically similar.”

A percentage is a presentation of a model score

Face-comparison systems first create numerical representations from images and compare those representations. A website may then map the comparison into a percentage that is easier for people to read. The displayed number is therefore part of a scoring system, not a direct measurement of DNA or family relationship.

70% does not mean 70% related

Biological relationship cannot be expressed by taking a face-similarity percentage and reading it as genetic relatedness. A parent and child can share visible traits while receiving a moderate image score, and unrelated people can sometimes look strikingly alike.

70% does not automatically mean identity

A resemblance tool and an identity-verification system have different purposes. LooksCompare is built for visual comparison and family curiosity. It should not be used to decide whether two images show the same legal identity.

The number needs context

A score is more understandable when you know the photo conditions. Were both faces clear? Were the head angles similar? Was one image heavily filtered? Was one photo from childhood and the other from adulthood? These details can matter more than a small difference between two percentages.

Close parent scores should be treated cautiously

If a child receives similar scores with mom and dad, a difference of only a few points is not a strong reason to declare one parent the definitive match. Another good photo can change the order. “Visually similar to both” is often the more sensible interpretation.

A better question than 'Is 70% good?'

Ask whether the result is reasonably consistent across several clear photos. That tells you something useful about the stability of the image comparison without pretending that the percentage has biological meaning.