Ape Index Calculator

What the ape index calculator does

Ape index compares your arm span to your height, capturing how long your reach is relative to your build. This tool works it out. You enter your wingspan and your height, in whatever units you like, and it returns your ape index.

The name is a nod to apes, whose arm spans tend to exceed their height by a good margin, and the number is a quiet favourite among climbers and combat-sport athletes, for whom reach is currency.

How to use it

1. Measure your wingspan, the distance from fingertip to fingertip with your arms stretched out wide, and enter it.
2. Enter your height, in the same or a different unit.

Press Calculate for your ape index, or Reset to clear the fields.

How the ape index is worked out

This tool calculates the ape index as a ratio, dividing your wingspan by your height:

Ape index = wingspan ÷ height

An ape index of exactly 1.0 means your arm span equals your height, which is where most people land, give or take. A value above 1.0 means your reach is longer than you are tall, a positive ape index, while a value below 1.0 means the reverse. You may also see ape index written as a simple difference instead, wingspan minus height, for example plus 5 centimetres, and this tool now gives you both. That is the same idea expressed as a length rather than a ratio, and both tell you whether your reach runs long or short for your height.

An example with real numbers

Say your wingspan is 186 cm and your height is 180 cm.

• Ape index = 186 ÷ 180 = 1.033

So your ape index is about 1.03, a positive figure, meaning your reach is roughly 3 percent greater than your height. Expressed as a difference, that is the same as a plus 6 centimetre ape index.

Why it matters in sport

A longer reach is a real advantage in several sports, which is why the number gets tracked. In climbing, extra reach lets you stretch to holds that would otherwise be out of range, sometimes turning an impossible move into a simple one. In boxing and mixed martial arts, reach lets a fighter land strikes from outside the opponent's range while staying out of theirs, so fight previews almost always list it. In swimming, longer arms mean a longer pull through the water with each stroke. That said, ape index is only one ingredient. Technique, strength, flexibility, and skill matter far more than proportions, and plenty of great climbers and fighters have an entirely average reach, so treat it as a small edge rather than a verdict.

Questions people ask

What is a good ape index?

Most people sit right around 1.0, where reach equals height. A value above 1.0, meaning your reach is longer than your height, is considered an advantage in reach-dependent sports like climbing and boxing.

How do I measure my wingspan?

Stand with your back to a wall and stretch both arms out horizontally, then measure from the tip of one middle finger to the tip of the other. Divide that by your height to get the ratio.

Is ape index a ratio or a difference?

Both forms are used. This tool gives it as a ratio, wingspan divided by height. Others express it as a difference, wingspan minus height. They convey the same thing in different units.

Does ape index really affect performance?

It can give a small edge in reach-dependent sports, but it is only one factor. Technique, strength, and skill matter far more, and many top athletes have an average reach.