No, big hands do not perfectly predict whether you will be tall.
While there's a weak correlation between hand size and height, it's not a definitive indicator. Height can give you a clue about hand size, and vice-versa, but many other factors influence both, making the connection imperfect.
Here's a breakdown:
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Correlation, Not Causation: A statistical relationship exists, meaning that taller people tend to have larger hands. However, this doesn't mean one causes the other directly.
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Other Factors at Play: Genetics, nutrition, and overall health significantly impact both height and hand size. Someone might have genes that predispose them to large hands but not great height, or vice versa.
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Weak Predictive Power: Studies show only a moderate correlation. The provided reference indicates an R2 value of 0.41, meaning about 41% of the variation in hand span can be explained by height. That leaves almost 60% down to other factors. This is far from a perfect predictor.
In short, while observing someone with large hands might make you guess they are tall, it's not a reliable method. Many people with large hands are of average or even below-average height, and many tall people have surprisingly small hands.
