How to measure your draw length

Draw length is the first number a compound bow is fit to, and getting it wrong makes every other setting fight you: too long and you overreach and lose your anchor, too short and the shot feels cramped and weak. You can estimate it at home in a minute with a tape measure and a wall, then confirm it before you spend. The draw length calculator does the arithmetic; this is how to take the measurement and read the result honestly.

Measure your wingspan

Stand with your back to a wall, heels flat, and hold both arms straight out to the sides at shoulder height, relaxed, palms forward. Have a helper measure from the tip of one middle finger to the tip of the other, in inches. That span, your wingspan, is the input the whole estimate rides on, so measure it twice and use the number you can repeat. Do not stretch or shrug: an inflated wingspan gives you an inflated draw length and a bow that never quite anchors right.

Divide your wingspan by 2.5

Take your wingspan in inches and divide by 2.5. A 70 inch wingspan gives 28 inches; a 65 inch wingspan gives 26 inches; a 74 inch wingspan gives about 29.6 inches. That result is your estimated draw length. The 2.5 divisor is the long-standing archery wingspan method, and it works because for most builds the arms and the draw stroke scale together with height.

What the number means: the AMO standard

Draw length has a formal definition, worth knowing so the number on a bow's spec sheet lines up with yours. Under the AMO and ATA standard the industry uses, draw length is the distance from the nock point on the string at full draw to the throat of the grip, its pivot point, plus 1.75 inches. Full draw is the anchored position you shoot from; the nock point is where the arrow clips onto the string. When a bow lists a draw length range, it is quoting this standard, so the wingspan estimate above is aimed at the same number.

Check it against the typical range

Most adult archers land between about 26 and 31 inches, with a lot of shooters in the 27 to 30 range, so if your estimate falls far outside that, remeasure before you trust it. The average adult male draw length sits around 28 to 29 inches, which follows from the wingspan method at average male height and is where most stock compound bows center their adjustment. Height is the rough guide the method captures: taller shooters draw longer, which is why a 68 inch span lands near 27 inches and a 72 inch span near 29. Treat a result like 33 or 24 inches as a flag to check your measurement, not a settled answer.

Confirm it at full draw before you buy

The estimate is a starting point, good to about half an inch. Most archers land within that of the measured number, so on a bow, try half an inch either side of your estimate and let your anchor confirm it: at the right draw length your bow hand sits naturally against your face at full draw, without reaching or collapsing. A pro shop settles it for good on a draw board, which measures the definitive number on the bow you are buying. If you are new to this, our beginner compound bow guide covers why a bow that fits beats a better spec sheet.

How draw length sets your arrow length

Draw length also decides how long your arrows need to be and, with draw weight, how much spine they need, which is why it comes before you buy shafts. A longer draw wants a longer, stiffer arrow. Our hunting arrows guide covers spine and length once you have your draw length in hand.

Measure your wingspan, run it through the calculator, and confirm the result at full draw before you spend. The standard behind every number on this site is on the how we test page.