How to Find the External Size of a Bow

Archery requires precision, not just in the shooting of the arrow, but in sizing the bow and draw. This is sometimes referred to as a bow's external sizing. In order to get the proper length draw and bow, take your arrow and draw measurement. This is applied to the proper length of bow shaft. The combination of the two gives the information to get a bow that fits your body.

Things You'll Need

  • Measuring tape
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Instructions

    • 1

      Hold the end of the measuring tape in one hand and grip the other end loosely in your other hand. Spread your arms out, making sure to hold one end firmly, and letting the other end of the tape move in the other hand. Once your arms are fully stretched out, take the measurement between the two.

    • 2

      Divide the number on the tape measure (the arm span) and divide it by 2.5. This is the draw length for your arm and body size. For example, if the tape reads 65 inches, the formula is 65 divided by 2.5 = 26 inches. Your draw length in this example is 26 inches.

    • 3

      Use arrows in your draw length plus two inches. In this example, it is 26+2 = 28 inches. This is due to the bow handle having an average of 1.75 inches on the nock and grip.

    • 4

      Select a bow whose shaft has a draw with the bend at the tips for your draw length, plus 2 inches. For example, take your adjusted draw length to an outfitter and find a bow suitable for your draw and arrow length, often referred to as the external measurements.