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This is the websites description of the calculations used:

The Herman sensors are queried every 10ms. The sensor returns the highest reading for each axis (X,Y, and Z) that it has read since the last time it was queried.

The value is subtracted from the resting/idle value for that axis.

Herman takes the three axis readings and determines the magnitude of the sensor reading using standard vector math. This effectively takes into account the energy from all three axis simultaneously.

Vector Magnitude = square root (X*X + Y*Y + Z*Z)

This value is then scaled from a digital reading to G forces knowing the maximum reading on each sensor is 40G.

This value is then multiplied by 2 yielding the score for this sensor reading. Effectively, the scores in Herman are two times the G force of the impact. A score of 20 correlates to an impact of 10G on the accelerometer.

If someone is able to assist me by giving me a conversion equation it would be most appreciative. Note. Highest form of math I've taken is Calculus, I will be taking Physics 213 in the fall, so I might need an explanation of the equation. Thank you for taking the time to read this.