between 6.3 and 8.75 degrees from each side.
*sorry being a bit of a smart ass)
average size EDC from 1/8 or 3/16 thick stock.. blade 3/4-1 1/2" tall.... id just mark the center line on the cutting edge and grind it down till its flat from the spine to the edge, but leaving the edge .010"-.020"
thick.
unless youre trying to program a CNC to grind them for you, there isn't much need to calculate out what degree the grind is.
just my thought.
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