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__INSEAM TO HEIGHT RATIO__Its calculated like this:

(Inseam ÷ Height) × 100

You measure inseam from your crotch to the floor.

An average inseam equals 45% of the height.

__How to choose lifts based on your Inseam to Height ratio:__

If you have a ratio of 46% and above you shouldnt go over 2 inches.

If you have a ratio between 44-45% you can comfortably run 2 inches, possibly 3 inches too.

If you have a ratio of 43% and below, the sky's the limit.

The next ratio looks at the relationship between the legs and the arms.

__APE INDEX__### Ape index - Wikipedia

en.wikipedia.org

Detract height from your arm span. The remaining positive/negative number is your ape index. You can also find it by dividing arm span by your height, but the former will be more suitable for determining how many height you can add with lifts without looking odd. Obviously the higher your ape index the better it is for the purposes of wearing lifts.

This girl has a +4 inches for example. She has a lot of wiggle room for heels. With the ape index -3/-4 inches is the lowest you should go as this is the lower end of the average person. So if you have an ape index of +2, in theory you could wear 5-6 inches of lifts before your arms would look disproportionate to your legs.

You can now use both of these measurements together to decide the best amount of lifts you can wear.