Most people’s wingspan is about equal to their height (ratio 1.0). A positive ape index – longer arms – gives reach in climbing, swimming, boxing and basketball. Michael Phelps’ wingspan exceeds his height by about 8 cm.
How to use the Ape Index Calculator
- Wingspan (arm span)
- Height
Results update as you type, every field has its own unit menu, and everything is calculated in your browser.
How it works
Measure your wingspan fingertip to fingertip with arms outstretched, and your height.
Tips
- Measure twice and take the average.
- Use the same units for related measurements.
- Everything is calculated in your browser.
- Treat results as estimates, not diagnoses.
Common mistakes to avoid
- Measuring with a slack or stretched tape.
- Comparing yourself with elite athletes too literally.
- Forgetting that technique matters as much as numbers.
Inputs explained
| Field | What to enter |
|---|---|
| Wingspan (arm span) | Units: cm, m, ft, in |
| Height | Units: cm, m, ft, in |
What each result means
- Ape index (ratio) = [Wingspan (arm span)]÷[Height]
- Ape index (difference) = [Wingspan (arm span)] – [Height]
Example values
How the main result changes when Wingspan changes and everything else stays at the example values above:
| Wingspan (arm span) (cm) | Ape index (ratio) |
|---|---|
| 90 | 0.514 |
| 135 | 0.771 |
| 180 | 1.029 |
| 225 | 1.286 |
| 270 | 1.543 |
| 360 | 2.057 |
Formula
Ape index (ratio) = wingspan ÷ height · Difference = wingspan − height
Worked example
Inputs — Wingspan (arm span): 180 cm; Height: 175 cm.
Results — Ape index (ratio) = 1.029; Ape index (difference) = 5 cm; Rating = Slightly positive.
Key terms
- Wingspan
- Distance between fingertips with arms spread.
Frequently asked questions
What is a good ape index?
Above 1.0 (positive) helps in climbing, swimming and combat sports.
What is the average?
About 1.0 – wingspan equals height.
Can I change my ape index?
No – it is set by bone length, though flexibility can add a little reach.
How do I measure wingspan?
Stand against a wall, arms out at shoulder height, and measure fingertip to fingertip.