How to Measure Your Draw Length

Tools and supplies

Tools

• Tape measure or yardstick (inches)
• A wall and a pen or marker
• A helper (recommended)

Steps

1. Stand in a natural posture against a wall

   Stand with your back to a wall, heels and shoulders touching it, looking straight ahead. Don't slouch or arch. This neutral posture is what makes the measurement repeatable.

2. Open your arms into a relaxed T

   Raise both arms straight out to the sides at shoulder height so your body forms a T, palms facing forward. Keep your elbows straight but do NOT stretch or reach — overreaching inflates the number and gives you a draw length that is too long.

3. Measure your arm span (wingspan)

   Have a helper measure the straight-line distance from the tip of one middle finger to the tip of the other, in inches. Mark the wall at each fingertip if you are working alone, then measure between the marks.

4. Divide your arm span by 2.5

   Take the arm-span figure in inches and divide it by 2.5. The result is your estimated draw length in inches. Example: a 70-inch arm span gives 70 / 2.5 = 28 inches. This estimate is your starting point, accurate to within roughly an inch for most adults.

5. Confirm at full draw (the AMO/ATA method)

   For the precise number, draw a properly fitted bow to your natural anchor and have a helper measure from the deepest part of the grip (the throat or pivot point) to the string at the nock, then add 1.75 inches. This 'pivot point + 1.75 in' figure is the industry-standard true draw length and is what you set a compound bow to.

6. Reconcile the two numbers

   Compare your wingspan estimate with the at-full-draw measurement. They should land within about an inch of each other. If they don't, trust the at-full-draw figure — it reflects your actual anchor and form — and have a coach watch you shoot before you lock in a setting.

Two ways to measure, and when to use each

There are two common ways to find your draw length, and they answer slightly different questions. The wingspan (arm-span) method is a fast body-measurement estimate you can do at home with a tape measure — ideal before you own a bow, or as a sanity check. The at-full-draw method (the AMO/ATA standard) measures your draw length on an actual bow at your real anchor, and it is the precise number you set a compound bow to.

Use the wingspan estimate to get in the right range, then confirm with the at-full-draw measurement once you have a properly fitted bow. The steps above walk through both in order.

Why “arm span ÷ 2.5” works

Draw length scales closely with overall arm span for most adult builds, and the long-standing rule of thumb is that arm span in inches divided by 2.5 lands near your draw length. It is an approximation — it assumes an average build and a textbook anchor — so treat the result as a starting point, typically accurate to within about an inch, not a final setting.

The single biggest source of error is overreaching when you open your arms. Stretching to make yourself “wider” inflates the arm-span figure and gives you a draw length that is too long, which then pushes you toward a bow setup and arrows that don’t fit. Keep your arms relaxed and your posture neutral.

Why the at-full-draw number is the one that counts

The AMO/ATA standard defines draw length as the distance, at full draw, from the string at the nock to the pivot point of the grip — the deepest part of the throat where the bow rotates in your hand — plus a fixed 1.75 inches. That 1.75-inch convention is built into the standard so a single measurement to the grip gives a consistent, comparable number across bows.

This is the figure that matters mechanically. On a compound bow, draw length is a fixed setting, so it has to match you exactly; too long and your anchor and release fall apart, too short and you lose power and consistency. The at-full-draw measurement reflects your real anchor and form, which the wingspan estimate cannot.

Common mistakes to avoid

• Overreaching during the wingspan measurement. The most frequent error, and it always makes draw length read long. Relax into the T.
• Slouching or arching against the wall. Posture changes the span. Stand naturally, heels and shoulders to the wall.
• Measuring at full draw with the wrong anchor. If your anchor isn’t yet consistent, the full-draw number will wander. This is exactly where a coach helps.
• Forgetting the 1.75-inch addition. Measuring only to the pivot point, without adding 1.75 inches, understates your true draw length.
• Treating the estimate as final. The wingspan figure gets you close; it is not a substitute for confirming on a bow.

When the two numbers disagree

If your wingspan estimate and your at-full-draw measurement land within about an inch of each other, you can be confident in your draw length. When they diverge by more than that, trust the at-full-draw figure — it is measured on a real bow at your real anchor — and don’t lock in a permanent setting until a coach has watched you draw and anchor. Long- or short-limbed archers, and anyone still building a repeatable anchor, are the most likely to see the two methods disagree, and that is precisely when an in-person check pays off.