Question 1

How do I calculate draw length?

Accepted Answer

Stand with arms outstretched parallel to the floor, palms forward. Measure fingertip to fingertip across your back. That distance is your wingspan. Divide the wingspan in inches by 2.5 to get your draw length. For example, a 70-inch wingspan gives a 28-inch draw length. This is the Archery Trade Association (ATA) standard used by every major bow manufacturer.

Question 2

Why divide wingspan by 2.5 when calculating draw length?

Accepted Answer

Industry research showed that the average adult's wingspan is about 2.5 times the natural draw length they adopt at anchor. The 2.5 divisor is independent of height, build, or gender because it reflects shoulder geometry, not overall body size. It gives a result accurate to within about ±0.5 inch for most archers.

Question 3

What is the formula for draw length?

Accepted Answer

Draw Length (inches) = Wingspan (inches) ÷ 2.5. This is the AMO draw length printed on bow spec sheets (e.g. '40#@28in'), so you match the result directly against bow labels. Cut arrows at least 1 inch longer than your draw length for safety.

Question 4

How do I calculate draw length for a compound bow?

Accepted Answer

The wingspan method gives you the correct draw length for a compound bow. Compound draw length is fixed by the cam module and measured to the AMO standard, which the calculator already reports. A compound bow must match your draw length exactly, within 0.5 inch. Ask a pro shop to measure you at full draw to confirm before buying.

Question 5

Can I measure draw length without a friend?

Accepted Answer

Yes. Use the height method as a fallback. Divide your height in inches by 2.5 for an approximate draw length. It is slightly less accurate than the wingspan method but good enough to start with. Toggle 'Height' in the calculator and enter your height in inches or centimetres.

Question 6

What is AMO draw length?

Accepted Answer

AMO (Archery Manufacturers Organization, now ATA) draw length is the standard spec printed on bow labels, e.g. '40#@28in' means the bow draws 40 lb at a 28-in AMO draw. The wingspan ÷ 2.5 formula this calculator uses gives you that AMO number directly, so you match the result against bow specs without any extra offset.

Question 7

How long should my arrows be?

Accepted Answer

Arrows should be at least 1 inch longer than your draw length, and ideally 1 to 2 inches longer for safety. A 28-inch draw length calls for 29 to 30 inch arrows. Never shoot an arrow shorter than your draw length. It can fall behind the rest at full draw and cause serious injury to your bow hand.

Question 8

What draw length is average for adults?

Accepted Answer

Adult male archers typically draw 27 to 29 inches; adult females draw 24 to 27 inches. Junior archers range from 18 to 24 inches depending on age and wingspan. Your draw length is personal, so use the calculator with your own wingspan rather than relying on averages.

Question 9

Does draw length change as I get stronger or taller?

Accepted Answer

For adults, draw length is stable once shooting form is established. Junior archers will outgrow a bow's draw length as they grow, so re-measure every 6 to 12 months. A few beginners see their draw length settle about 0.5 inch longer after their shoulders open up through consistent practice.

Question 10

What recurve bow length should I buy for my draw length?

Accepted Answer

Rule of thumb: up to 22 in pairs with a 58-in bow, 23 to 25 in with a 64-in bow, 26 to 28 in with a 66-in bow, 29 to 31 in with a 68-in bow, 32 to 33 in with a 70-in bow, and 34 in or more with a 72-in bow. Longer bows are smoother and less prone to stacking. The calculator recommends a size when you select 'Recurve' or 'Longbow'.

Question 11

Is there a difference between draw length for a recurve and a compound bow?

Accepted Answer

The calculation is the same: wingspan ÷ 2.5. The difference is how the number is used. Compound draw length is fixed and must match exactly. Recurve draw length is personal to your anchor, and bows are not strictly 'sized'; you just pick a bow long enough to feel smooth at your draw.

Question 12

How accurate is the wingspan draw length calculator?

Accepted Answer

For adults, the wingspan method is typically accurate to within ±0.5 inch of actual measured draw length. That is the same precision at which compound bows adjust. Always verify on the bow at a pro shop before final purchase, especially for compound bows where the wrong setting produces poor shots.

Draw Length Calculator

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Draw Length	Recommended Bow	Typical Archer
Up to 22 in	58-in bow	Junior / youth
23 to 25 in	64-in bow	Short-frame adult
26 to 28 in	66-in bow	Average adult
29 to 31 in	68-in bow	Taller / longer reach
32 to 33 in	70-in bow	Very tall archers
34 in and up	72-in bow	Exceptional reach