HEIGHTCOMPARE · MEASURE & COMPARE

How does your arm span compare?

Compare your measured arm span with your standing height.

How to use ↓

Use a fingertip-to-fingertip measurement with your arms extended horizontally.

Feet use decimals: 5.5 ft equals 5 ft 6 in.

Wingspan-to-Height Ratio Calculator

Enter your measured standing height and fingertip-to-fingertip arm span to calculate their ratio and difference. The tool works locally in your browser and creates a downloadable comparison card.

How to use the wingspan-to-height calculator

  1. Measure your barefoot standing height, or enter a known measured height.
  2. With your arms extended horizontally, measure from one middle fingertip to the other. Ask someone to help keep the tape straight. Do not include a reach above your head.
  3. Select a unit for each measurement. Decimal feet are supported: 5.5 ft equals 5 ft 6 in.
  4. Select Calculate comparison. Read the ratio and the signed difference, then download your PNG if you want a copy.

Ratio and difference mean different things

The ratio is wingspan divided by height. The difference, sometimes called an ape index, is wingspan minus height. Some sources also use “ape index” for the ratio, so this calculator labels both formulas explicitly.

Worked example

A height of 170 cm and wingspan of 175 cm give 175 ÷ 170 = 1.029 when rounded to three decimal places. The difference is +5 cm. If wingspan is 165 cm at the same height, the difference is −5 cm and the ratio is about 0.971.

Questions and answers

Is a higher ratio better?

This calculator does not assign a better or worse score. A ratio describes two measurements; it does not assess health or predict sporting performance.

Can I estimate wingspan from my height?

This tool uses a wingspan you measured. It does not assume that everybody’s arm span equals their height.

Are my measurements saved?

No. Entries are held in the current page. Downloaded cards contain the measurements you choose to export.

Can I enter different units?

Yes. Each input has its own unit selector. The tool converts both to centimetres before dividing or subtracting.

Try our height converter or build a family height chart.

Terminology reference: Lattice Training describes both the difference and ratio methods. Our calculator uses the entered measurements and shows both formulas.