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. Cut arrows 1.0″–1.5″ longer than draw length for broadhead and riser clearance.
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
An arrow cut exactly to draw length can pull back off the rest or let the broadhead ride behind the riser's front edge at full draw — a real safety risk, not just an accuracy one. This calculator's 1.0″–1.5″ range is a starting point; Nock On Archery's own cutting guide confirms it with a full-length shaft: draw it and mark where it lines up with the riser's front edge before a final cut.
Is a Height-Based Draw Length Accurate?
Not on its own. The height formula here — (height − 15) ÷ 2 — exists as 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 on this page land more than about an inch apart, remeasure the wingspan before trusting either one.
🗣️ 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 formula is (height − 15) ÷ 2, useful for flagging a wingspan reading that looks off rather than for finding a number on its own.
Why should arrows be cut longer than draw length?
For broadhead and riser clearance at full draw — an arrow cut exactly to draw length is a real safety risk, not just an accuracy issue. This page recommends 1.0″ to 1.5″ longer as a starting range, confirmed against a full-length shaft marked at the riser.
🎯 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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Did the wingspan and height numbers land close together, or was one of them off? Your measurement beats an opinion — leave it here and the next reader gets the benefit.