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Draw length is the distance an archer pulls a bowstring back, and it is one of the key measurements for fitting a bow. This calculator uses the standard AMO (Archery Manufacturers Organization) wingspan method: draw length (inches) = wingspan (inches) / 2.5. This is equipment-fitting guidance, not a medical calculation. For a precise final fitting, have a bow measured by an archery pro shop or qualified coach, since grip style and individual anatomy can shift the ideal draw length slightly.
How it works
Enter your wingspan (fingertip to fingertip with arms stretched out to the sides). The tool converts it to inches and divides by 2.5 to estimate draw length.
- Enter wingspan / arm span (cm).
- Click Calculate to see your results.
Examples
A 175cm wingspan
175cm ≈ 68.9 in wingspan, giving an estimated draw length of about 27.6 in.
Who should use it
- Getting a starting draw length estimate before buying or adjusting a bow.
- Checking a bow shop's fitting against a quick independent estimate.
Industry applications
- Archery equipment retail
- Recreational and competitive archery coaching
Advantages
- Quick estimate requiring only one measurement.
- Based on the standard AMO archery industry formula.
Limitations
- Does not account for individual grip style or shooting form.
- Best used as a starting point before a professional fitting.
Common mistakes to avoid
- Measuring wingspan with arms not fully extended or shoulders hunched, which shortens the reading.
- Treating the estimate as final without a pro-shop fitting.
Best practices
- Measure wingspan with your back against a wall, arms fully extended, for the most accurate reading.
Tips
- If your estimate falls between two common draw lengths, most archers do better sizing down slightly rather than up.