Sports

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APE Index Calculator.

Compare arm span with height using the transparent APE index formula.

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Set your values

Results update as you type.

APE index: 1.028571

APE index

0.000000
Arm span − height: 5

Arm span − height

0.000000
Difference (%): 2.857143

Difference (%)

0.000000

Results update automatically as you type.

Use Cases

Assess physical proportions for sports

Use the APE index to evaluate whether your arm span relative to height may be beneficial for sports like basketball, climbing, or swimming.

Example: A climber with an arm span of 185 cm and height of 175 cm has an APE index of +10.

Understand your body measurements

Quickly compare your arm span and height to see how they relate, which can be interesting for personal fitness tracking or tailoring clothing.

Example: Enter your arm span and height in cm to see your personal APE index and ratio.

Frequently Asked Questions

What is the APE index and how is it calculated?
The APE index is the difference between your arm span and your height. It is calculated by subtracting your height from your arm span (both in cm). A positive value means your arm span is longer than your height, while a negative value means the opposite.
What does a positive or negative APE index mean?
A positive APE index (arm span > height) is often associated with advantages in sports like climbing or swimming. A negative index (arm span < height) is common in the general population. The calculator also shows the ratio of arm span to height for reference.
Is the APE index the same as the arm span to height ratio?
No. The APE index is the difference (arm span minus height) in cm. The ratio is arm span divided by height, often expressed as a decimal. This calculator provides both values for a complete comparison.

Tips & Common Mistakes

Tips

  • Measure your arm span accurately: stand against a wall with arms outstretched, and measure from fingertip to fingertip.
  • Measure your height without shoes, standing straight against a wall for the most accurate result.
  • Use the same units (cm) for both measurements to ensure the calculator works correctly.
  • The APE index is a simple reference; it does not determine athletic ability or health.

Common Mistakes to Avoid

  • Using different units for arm span and height (e.g., cm for one and inches for the other) will produce incorrect results.
  • Measuring arm span incorrectly, such as not fully extending arms or measuring from shoulder to shoulder instead of fingertip to fingertip.
  • Misinterpreting the APE index as a measure of fitness or health; it is only a proportional comparison.

Last updated: August 13, 2026