Block out of square

Treblig said

This on line calculator lets me input inches and it also says 1.5" rise at 22 inches with a 4 degree angle. Am I doing something wrong here??

Right Triangle Side and Angle. Calculator | Formula - Omni

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0.4 deg :)

Think with congruent triangles. If I have 40 thou of error out at a distance of 8" (rough size of bell), then out at 20" (lenght of block), it's about 100 thou.