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THE FEUTEX TOOLKIT

Archery Group Angular Spread

Express measured group diameter as angular spread and scale it to another distance.

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02 Your result
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FormulaAngle = 2*Math.atan(spread/200/distance)*180/Math.PI; Projected = spread*target_distance/distance

Worked example

Inputs

Spread
10 cm
Distance
50 m
Target distance
70 m

Expected results

Angle
0.1145915208 degrees
Projected
14 cm

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the measured quantities and your own planning assumptions.
  2. Review all calculated outputs and the stated limitations.

Try this example

{
  "spread": 10,
  "distance": 50,
  "target_distance": 70
}

Accuracy and scope

Geometric comparison only. A constant angular group does not predict actual accuracy under different wind, equipment or distance conditions.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.