The Rifle Sight Correction Angles calculator computes the Minutes of Angle
corrections based on the range to the target (R) and the horizontal and vertical errors at the target.
INSTRUCTIONS: Choose units and enter the following:
- (R) Range (distance) to Target
- (h) Horizontal Offset (positive to the right of center and negative to the left of center)
- (v) Vertical Offset (positive above center and negative below center)
Rifle Sight Correction Angles (α, β): The calculator returns the vertical correction angle (α) and horizontal correction angle (β) in minutes of angle (MoA). However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The horizontal and vertical dials on rifle sites are typically in Minutes of Angle. A minute of angle is 1/60th of a degree angle. The calculator converts the correction angles to that unit (minute of angle). The effect of a small error in the angle of a sight will increase with range.
The formula for the rifle sight correction angles are:
α = atan(v/R)
β = atan(h/R)
where:
- α = vertical correction angle
- β = horizontal correction angle
- R = range to target
- v = vertical offset
- h = horizontal offset
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