The 2D:4D ratio is calculated by measuring the length of the index finger of the right hand, then that of the ring finger, and dividing the former by the latter. A longer index finger will result in a ratio higher than 1, while a longer ring finger will result in a ratio of less than 1.
The 2D:4D digit ratio is sexually dimorphic: in males, the second digit tends to be shorter than the fourth, and in females the second digit tends to be the same size or slightly longer than the fourth.
A number of studies have shown a correlation between the 2D:4D digit ratio and various physical and behavioural traits.
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