How to use the calculator
- Enter your arm span in either inches or centimeters. Measure from the tip of your left middle finger to the opposite shoulder when your arms are extended straight forward.
- Select your draw hand (left or right).
- If you've adjusted your nocking point from the standard position, enter that value here. Otherwise, leave it at 0.
- Click the "Calculate" button to get your recommended draw length.
Understanding the formula
The calculator uses the following formula based on arm span:
Draw Length = (Arm Span ÷ 2.54) × 0.85 + Nocking Point Adjustment
This formula converts your arm span from inches to centimeters (÷ 2.54), then applies the industry standard factor of 0.85 (which represents approximately 85% of the arm span), and finally adds any nocking point adjustment you've made.
Important considerations
- This calculator provides a recommended draw length based on arm span. Individual comfort may vary.
- For beginners, it's often recommended to start with the calculated draw length and adjust as needed.
- The nocking point is the position on the bowstring where the arrow nock is placed. Adjusting this can affect your draw length and shooting form.
- For the most accurate measurement, have someone measure your arm span while your arms are extended straight forward.