## The Ape Index

"Ape index, or ape factor, is a measure of the ratio of an individual's arm span relative to their height. A typical ratio is 1, as identified by the Roman writer, architect and engineer Vitruvius prior to 15 BC." Ape Index, Wikipedia

There are two versions of the Ape Index:

• Usually it is defined as the ratio of arm span to height:
Ape Index 1 = Arm Span / Height
If you're 175cm tall and your arm span is 180cm your ape index would be 1.028
• For the alternative approach the height is subtracted from your arm span:
Ape Index 2 = Arm Span - Height
Still being 180cm tall and with an arm span of 175cm this alternative ape index would be 5 (cm).

In sports like rock climbing, swimming or boxing some people believe that a positive Ape Index, (a value greater than 1), where the arm span is greater than the height, is a competitive advantage. Others doubt it.

## Your Ape Index

in centimeters   in inches

## So what?

Now you know your monkeyness level, but is it good or bad? It depends, every Ape Index has its own advantages:

• If your Ape Index is not even 1 (Index 1), or negative (Index 2) your friends can call you T-Rex.
• If it is near 1 (Index 1) or 0 (Index 2) some Italians may ask you if they can paint you - naked.
• If it is more than 1 (Index 1) or positive (Index 2) you can pick up things from the ground without bending your knees to much.

So whatever it is, be proud of your Ape Index!

## Compare your Ape Index

If you're more the competition type of monkey (or T-Rex, or naked model) these numbers may interest you:

• Boxer Sonny Liston had an incredible Ape Index of 1.158 (Index 1) / 29cm (Index 2).
• German discus thrower Lars Riedel has an Ape Index of 1.055 (Index 1) / 11 cm (Index 2).
• World class swimmer Michael Phelps has an Ape Index of 1.04 (Index 1) / 3 inches (Index 2).
• The guys at Mountain Project asked their forum members about their height and armspan. About 50 people answered (all of them climbers). The average Ape Index was 1.0311 (Index 1) / 2.2 inches (Index 2).

## The End

That's all. Now move on, get some bananas or improve your drunken monkey style!