Bow Tuning Calculator
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The IBO rated speed in feet per second (fps) of your bow
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The weight in grains (gr) of your nock
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The draw weight you've set your bow at in pounds (lbs)
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The combined weight in grains (gr) of your fletchings
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The draw length you've set your bow at in inches (in)
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The weight in grains (gr) of your arrow head insert
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The length of your arrow in inches (in)
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The combined weight in grains (gr) of the accessories on your bow string
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The grains per inch (gpi) weight of your arrow
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The weight in grains (gr) of your arrow head
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Impact Force
Game Kill Chart Force
| Game Type | Impact Force | Example Game | |
|---|---|---|---|
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Largest Game | > 65 ft-lbs | Moose, Grizzly, Musk Ox |
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Large Game | 42 - 65 ft-lbs | Elk, Black Bear, Wild Boar |
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Medium Game | 25 - 41 ft-lbs | Deer, Antelope, Sheep |
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Small Game | < 25 ft-lbs | Turkey, Groundhog, Squirrel |
Arrow Stats
| Arrow Speed (on Release) | Arrow Weight | ||
|---|---|---|---|
Impact Force at Yardages
| Point Blank | 10 Yards | 20 Yards | 30 Yards | 40 Yards | 50 Yards | 60 Yards | 70 Yards | 80 Yards | 90 Yards | 100 Yards | 150 Yards | 200 Yards |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Arrow Spine
Arrow Spine Deflection Ranges
| 1 Least Stiff | 2 | 3 | 4 | 5 | 6 | 7 Most Stiff |
|---|---|---|---|---|---|---|
| 0.580 - 0.620 inches | 0.480 - 0.520 inches | 0.430 - 0.470 inches | 0.380 - 0.420 inches | 0.330 - 0.370 inches | 0.280 - 0.320 inches | 0.230 - 0.270 inches |
Arrow Stats
| Draw Weight | Arrow Head Weight | Arrow Length | Ideal Spine Rating |
|---|---|---|---|
Front-of-Center (FOC)
Front of Center Explanation
Arrow Stats
| Arrow GPI | Arrow Front Weight | Arrow Back Weight | Arrow Total Weight | Arrow Length |
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Front of Center Stats
| Ideal Balance Point Range | Balance Point | Front of Center % |
|---|---|---|