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Calcimator

Rifle Zero Calculator

Point of impact at various distances from zero distance.

Inputs

Results

POI shift at target (in)

-3.73

MOA adjustment needed-1.78
MIL adjustment needed-0.52
Total bullet drop (in)9.92
Time of flight (sec)0.23
Velocity at target (fps)2,506
How to Use This Calculator
  1. Enter your Zero Distance in yards (the distance where bullet hits point of aim).
  2. Set Target Distance in yards for the downrange calculation.
  3. Enter Muzzle Velocity in fps, Ballistic Coefficient (G1), and Sight Height in inches.
  4. Review POI Shift (inches above or below aim point), MOA Adjustment, and MIL Adjustment.
  5. Use Total Bullet Drop, Time of Flight, and Velocity at Target for long-range planning.

How the result changes with Target distance (yards)

Target distance (yards)POI shift at target (in)
201-3.8
701-137.35
1,300-756.69
1,800-2,051.79

What each input means

Zero distance (yards)
Distance at which the rifle is zeroed (bullet hits point of aim).
Target distance (yards)
Distance to the target you want to calculate drop for.
Muzzle velocity (fps)
Bullet velocity at the muzzle in feet per second.
Ballistic coefficient (G1)
G1 ballistic coefficient of the bullet (higher = less drag).
Sight height (inches)
Height of the sight/scope centerline above the bore centerline.

What each result means

POI shift at target (in)
Point of impact above (+) or below (-) point of aim at the target distance.
MOA adjustment needed
Scope turret adjustment in MOA (positive = up).
MIL adjustment needed
Scope turret adjustment in milliradians.
Total bullet drop (in)
Absolute gravitational drop from bore line at target distance.
Time of flight (sec)
Time for the bullet to reach the target.
Velocity at target (fps)
Remaining bullet velocity at the target distance.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Zero distance (yards) = 100, Target distance (yards) = 200, Muzzle velocity (fps) = 2800, Ballistic coefficient (G1) = 0.45 = 5 input(s) provided
  2. Calculate POI shift at target
    POI shift at target = riseFromBoreAngle - sightHeightIn - dropAtTarget
    -3.73 = -3.73
  3. Calculate MOA adjustment needed
    MOA adjustment needed = (poiShiftIn / (targetDistanceYds * 36)) * 3438
    -1.78 = -1.78
  4. Calculate MIL adjustment needed
    MIL adjustment needed = moaShift / 3.438
    -0.52 = -0.52

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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