Draw Length Calculator
Quickly estimate your ideal archery draw length using the trusted wingspan method. Get personalized recommendations for bow setup and arrow length.
Stand with arms extended straight out. Measure fingertip to fingertip.
Arrow length depends on arrow rest type, broadhead/point weight, and shooting style. Always verify with a qualified archery shop before cutting arrows.
Understanding Draw Length
Draw length is the distance from the nock point on the bowstring to the throat of the grip (plus 1.75 inches) when you're at full draw. It's one of the most critical measurements for proper bow fit.
If your wingspan is 70 inches:
Draw Length = 70 ÷ 2.5 = 28 inches
Recommended Arrow Length = 28 + 1.5 = 29.5 inches
Why Correct Draw Length Is Essential
Using the wrong draw length affects accuracy, comfort, and can lead to injury. A draw length that's too long causes over-extension; too short leads to cramped form and inconsistent anchor points.
How to Measure Your Wingspan
- Stand with your back against a wall, arms extended straight out at shoulder height (forming a "T").
- Keep your palms facing forward and fingers extended.
- Have someone measure from the tip of your left middle finger to the tip of your right middle finger.
- Record the measurement in inches or centimeters.
Alternative Methods
Some archers estimate draw length from height, but this is less accurate since arm length varies independently of height. The wingspan method remains the gold standard for initial estimates.
Common Mistakes
- Measuring with arms not fully extended
- Slouching or not standing straight
- Using a flexible tape measure incorrectly
- Confusing draw length with arrow length
Frequently Asked Questions
Draw length is the distance you pull the bowstring back when at full draw, measured from the nock point to the pivot point of the grip plus 1.75 inches. It determines proper bow fit and arrow selection.
The 2.5 divisor is an industry-standard approximation that accounts for average human proportions and typical anchor point placement. It provides a reliable starting estimate for most archers.
For many people, wingspan roughly equals height, but this varies. Some individuals have longer or shorter arms relative to their height, which is why measuring wingspan directly is more accurate.
The measurement concept is similar, but compound bows have adjustable draw length modules that must be set precisely. Recurve bows are more forgiving but still benefit from proper sizing.
If your calculated draw length falls between standard sizes, consider factors like your anchor point preference. Many archers round down slightly for a cleaner release.
The wingspan method described here is the most common way to estimate draw length without equipment. Professional shops can also use specialized draw-length arrows.
Your physical draw length remains fairly constant as an adult. However, technique improvements and anchor point adjustments may warrant remeasurement periodically.
Arrow length is typically 1 to 2 inches longer than draw length for safety. This ensures the arrow extends past the rest at full draw and accommodates different point weights.
Yes, but children's draw lengths change as they grow. Youth bows often have adjustable draw lengths to accommodate growth spurts. Remeasure every 6-12 months.
Correct draw length allows for consistent anchor points, proper back tension, and natural alignment. Too long causes overextension; too short leads to cramped form and inconsistent releases.