Calculate your archery draw length from wingspan, height, or forearm measurements. Get arrow length, spine recommendations, and bow size guidance.
The Archery Draw Length Calculator determines your ideal bow draw length using wingspan, height, or forearm measurements — the most critical measurement in archery for accuracy, comfort, and injury prevention. Draw length that is too long or too short causes form breakdown, reduced accuracy, inconsistent anchor points, and shoulder strain.
The standard method divides your arm wingspan (fingertip to fingertip with arms extended) by 2.5 to estimate draw length. This works because wingspan and draw length correlate closely with arm proportions. For compound bows, draw length is set mechanically and must be precise. For recurve and longbow shooters, draw length determines optimal bow length and affects arrow selection.
This calculator provides three measurement methods (wingspan, height, forearm), adjusts for shooting style (release aid vs. finger shooting), recommends arrow length and spine, suggests recurve bow sizes, and includes a comprehensive reference table for draw length by height. Whether you are a beginner choosing your first bow or an experienced archer fine-tuning your setup, accurate draw length is the foundation of good archery form.
An incorrect draw length is the most common equipment error in archery and one of the hardest to self-diagnose. Too long causes shoulder overextension and inconsistent anchor; too short reduces power stroke and creates a cramped release. Getting draw length right from the start prevents injuries and accelerates skill development.
Draw Length = Arm Wingspan ÷ 2.5 Alternative: Draw Length = Height ÷ 2.5 (less precise) Alternative: Draw Length = Forearm Length × 2.6 Adjustments: • Finger shooting (3-under): subtract 0.5" • Finger shooting (split): subtract 0.25" • Longbow: add 1" to standard calculation Arrow Length = Draw Length + 1.5" (safety margin) ATA Standard: Nock groove to pivot point + 1.75"
Result: Draw Length: 28.8" → 29.0" (rounded to nearest 0.5")
72" wingspan ÷ 2.5 = 28.8". Rounded to 29.0" for compound bow settings. Recommended arrow length: 30.5" (DL + 1.5"). Arrow spine range: 340–400 depending on draw weight. This is typical for someone approximately 6'0" tall.
Stand against a wall with arms extended horizontally at shoulder height, palms facing forward. Have someone mark your left and right middle fingertips on the wall, then measure the distance. Do not reach or stretch — keep your shoulders relaxed and natural. Measure 2–3 times and average. Your wingspan divided by 2.5 gives estimated draw length. Note that wingspan and height are approximately equal for most people, but arm-length variations of ±2" are common.
For compound bows: most modern compounds have adjustable draw lengths (via cam modules) typically covering 2–3" of range. Ensure the bow you purchase covers your draw length. For recurve bows: draw length determines optimal bow length — shorter draw lengths (<27") pair with 62–66" bows, medium (27–29") with 66–68", and long (>29") with 68–70". A bow too short for your draw length will "stack" (exponentially increasing draw weight past optimal) and be unstable.
The most common mistakes are: (1) setting draw length too long (often because archers confuse "more power" with "better"), (2) not adjusting for shooting style (finger vs. release), (3) using height instead of wingspan for people with disproportionate arms, (4) not verifying with actual shooting (theoretical calculations should be confirmed at a pro shop), and (5) not re-checking as form develops over the first year of shooting.
Draw length is the distance from the nock point on the bowstring (at full draw) to the pivot point of the grip, plus 1.75 inches (per ATA/AMO standard). It determines how far back you pull the bowstring and directly affects power stroke, arrow speed, and shooting form. Correct draw length allows a comfortable, consistent anchor point and natural alignment.
Draw length affects every aspect of shooting: too long causes over-extension (shoulder injuries, face contact with string, inconsistent anchor), too short reduces power stroke (lower arrow speed, cramped release, elbow chicken-wing). Even 1" of error significantly impacts accuracy. It's the single most important measurement when setting up a bow.
The wingspan/2.5 method is accurate within ±1" for about 80% of archers. Individuals with disproportionately long or short arms relative to their height may need adjustment. The most precise method is the "draw check arrow" method at a pro shop, where you draw a marked arrow and the actual draw distance is measured at the riser.
The measurement is the same, but compound bows have mechanical stops that set a fixed draw length (adjusted via cam modules). Recurve bows don't have mechanical stops — draw length is determined by the archer's anchor point and form. Finger shooters on recurves typically shoot 0.25–0.5" shorter than release-aid shooters on compounds.
Draw length determines minimum safe arrow length (DL + 1–2" for safety). It also affects arrow spine selection: longer draw lengths with higher poundage require stiffer shafts (lower spine numbers). An arrow that's too weak (high spine number) for your setup will flex excessively and fly erratically; too stiff will not tune properly.
Your actual arm span doesn't change (after growth is complete), but your effective draw length can change as your form develops. Beginners often settle into a slightly longer draw length (+0.5") as they develop a more open stance and consistent anchor point. If you notice form changes, have draw length re-measured annually.