Draw Length Calculator
Find your draw length and safe arrow-cut length from your wingspan, cross-checked against height — move a slider and every number below updates instantly, in inches or centimeters.
ArcheryEra's calculators are built and maintained by a mechanical engineer with 8+ years of archery-domain experience. Models, assumptions and limitations are shown, not hidden.
Want to see the exact formulas and physics behind this calculator? Read our Methodology & Assumptions →
Quick Tools
Two measurements, one draw length you can act on
Wingspan is the primary read; height is a cross-check, not a second vote. Pick a bow type and the recurve/traditional adjustment is applied automatically.
Useful? This one is free, and staying free. If it saved you a mis-cut shaft, you can put a coffee towards the hosting.
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+ Add height for a second check (optional)
Bow type
Recurve and traditional shooters commonly draw about half an inch longer than the raw wingspan formula for comfortable anchor and back tension — this toggle applies that adjustment for you.
Anchor & loop tolerance
Guide
The Math & How to Measure
💡 Quick Summary
Core Insight: Draw length = wingspan (fingertip to fingertip) ÷ 2.5. Recurve and traditional shooters add roughly 0.5″ for anchor comfort; compound shooters use the number as calculated. Start arrows at draw length to +1″ on a compound (+1.0–1.5″ on a recurve), then mark a full-length shaft at full draw before cutting.
Ideal For: Anyone sizing a new bow or a first set of arrows before a shop visit, or sanity-checking a draw length a shop already set for you.
How Do You Measure Wingspan for Draw Length?
Stand square to a wall, arms stretched straight out to the sides at shoulder height, and have someone measure fingertip to fingertip in a straight line. Nock On Archery's own measurement guide uses this exact wingspan-over-2.5 method as the standard starting point, and it's the one this calculator runs on by default.
Divide by 2.5. A 70″ wingspan gives a 28″ draw length. That's the whole formula — no chart, no guesswork.
Add the bow-type adjustment. Toggle to Recurve/Traditional above and the calculator adds roughly half an inch for the deeper anchor and back-tension position those styles use; compound shooters take the number as-is.
⚠️ Why Arrow Length ≠ Draw Length
What has to clear is the riser and the rest, not your body. At full draw the end of the shaft should reach at least the front of the riser, and a fixed-blade head needs roughly ½–1″ ahead of the rest. On a compound that mark usually lands between about an inch under and an inch over draw length — ATA’s Archery 360 guide gives 28.5–31″ arrows for a 30″ draw — so this calculator’s range is only a place to start. Nock On Archery’s cutting guide finishes the job: draw a full-length shaft and mark it at the riser’s front edge. More than an inch under draw length is the one reading worth treating as a red flag.
Is a Height-Based Draw Length Accurate?
Not on its own. The height check here predicts your wingspan from height using a fit to the measured span and stature of 6,068 US Army adults (wingspan ≈ −5.26 + 1.107 × height), then divides by 2.5. It replaced an older (height − 15) ÷ 2 rule that ran about 1.5″ short on that data. It is a cross-check, not a second method to average in. Nock On Archery's guide is direct about this: height-based charts are "only rough estimates and often inaccurate," since torso and limb proportions vary independently of overall height. If the two numbers land more than about an inch apart, remeasure the wingspan first; if it holds, you simply have a longer or shorter ape index than average (about 1 adult in 5 does), and the wingspan number wins. For why height-only charts run short for most people, see my draw length by height analysis of 6,068 measured adults.
🗣️ Community Consensus & Synthesis Grid
Reddit/Discord Sentiment: Aggregated from recurring draw-length threads on r/Archery and ArcheryTalk's technical forum, the wingspan-over-2.5 formula is treated as the reliable starting number, with a shop's T-formation or full-draw check recommended before committing to a final bow-press setting.
Top Praised Point: Threads consistently push back on height-only charts as too coarse for anything beyond a rough guess.
Common Friction Point: New archers report being sold on a single flat number with no bow-type adjustment, then re-pressing a compound's cams or re-cutting arrows once a recurve/traditional anchor point turns out to sit noticeably longer.
Frequently Asked Questions
How do you calculate draw length from wingspan?
Measure fingertip to fingertip with arms out in a T-pose, then divide by 2.5. A 70″ wingspan works out to a 28″ draw length — the same method this calculator runs on by default.
Is height a reliable way to find draw length?
Treat it as a rough cross-check, not a primary method. This calculator's height check predicts wingspan from height with a fit to 6,068 measured adults (wingspan ≈ −5.26 + 1.107 × height), divides by 2.5, and flags a wingspan reading that looks off. It does not replace one.
Should arrows be cut longer than draw length?
Not always. Clearance is set by the bow: at full draw the shaft has to reach the front of the riser, and a fixed-blade head needs roughly half an inch to an inch ahead of the rest. On a compound that usually lands between about an inch under and an inch over draw length, so this page gives draw length to +1″ as a starting range; recurves, which draw the point back to the plunger or clicker, start at +1.0″ to +1.5″. Either way, mark a full-length shaft at full draw before the final cut.
🎯 Verdict
Our Final Take: Wingspan ÷ 2.5 gets most archers within a fraction of an inch of their real draw length, and the height cross-check is there to catch a bad wingspan measurement, not to be averaged in as a second opinion.
👉 Recommendation: Use this number to walk into a shop already informed, then confirm on a bow with an adjustable module or a draw-check board before a final press or cut.
Draw length and arrow-cut length are estimates from standard archery formulas, not a substitute for an in-person check with an adjustable bow or a draw-check board. See Arrow Length vs. Draw Length for the fuller breakdown of how the two numbers relate once spine and point weight are in play.
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