Ape Index Calculator

Find your ape index (arm span minus height).

Arm span

Height

Ape index 3

Span-to-height ratio 1.017

Formula: index = arm span − height

Step-by-step with your numbers:

1. Values used:

2. Arm span = 183

3. Height = 180

5. Ape index = Arm span - Height = 183 - 180 = 3

6. Span-to-height ratio = Arm span / Height = 183 / 180 = 1.017

Did we solve your problem today?

Ape index compares your arm span to your height — a positive value helps in climbing.

The math behind it

index = arm span − height. A ratio above 1 (positive index) means long arms for your height.

183 cm span, 180 cm height → +3 cm (ratio 1.017).

Why does it matter for climbing?

Longer reach lets you span farther between holds.