## Arrow Efficiency Calculator – Instructions

- Select Preferred Arrow Efficiency
: IBO arrow (5 grains/per pound of draw weight).**Max Speed**: arrow ~10-15% over IBO (5.5 grains/per pound of draw weight).**Max Efficiency**: arrow ~20% over IBO (6 grains/per pound of draw weight).**Max Energy**

- Chronograph Arrow Speed
- Shoot three arrows and use the average of the three shots.

- Enter Data Below for Results
- Enter speed and arrow weight data into the calculator.

- View Results*
- Dark Blue: Optimal arrow weight.
- Light Blue: Range of efficient arrow weights.
- Red: Highlights specific speeds in fps and MAX energy (KE and M).

*All data are approximate.

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