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Ballistics lab

Ballistic Trajectory Calculator

Focus on the distance table version of the tool for a quick printable drop chart.

Saved rifle and reload

Select either record independently, or select both to use their combined chronograph velocity when one has been recorded.

Fills the confirmed zero and sight height stored on the firearm profile. Caliber is also used to prevent mismatched reload combinations.
Fills muzzle velocity, bullet weight, drag model, and the current catalog ballistic coefficient for this saved recipe.

Loading saved ballistic profiles…

Atmosphere

Current conditions

Location is requested only when you click, rounded before lookup, and not saved.

Manual weather values are active.

Enter the average muzzle velocity for this load in feet per second. Use chronograph data from the firearm when available.
Enter the projectile weight printed by the bullet manufacturer, in grains. Do not enter the completed cartridge weight.
Enter the manufacturer-published BC for this exact bullet and choose its matching G1 or G7 drag model. BC is a unitless measure of drag efficiency.
Use the drag model attached to the published BC. G1 values are common for traditional bullet shapes; G7 is commonly supplied for modern boat-tail bullets.
Enter the distance where the bullet path intersects the line of sight for your confirmed zero.
Measure vertically from the center of the bore to the center of the optic or sight line. Typical scoped rifles are often around 1.5 to 2 inches.
Set the farthest distance to calculate and display. The exact maximum is always included even when it is between table steps.
Choose the distance between trajectory rows, such as 25, 50, or 100 yards. Smaller intervals produce a more detailed table.
Enter the average wind speed along the bullet path. Use 0 for a no-wind trajectory.
Angle relative to the line of fire: 0 or 180 degrees is head/tail wind, 90 is a full-value crosswind, and 270 is the opposite crosswind direction.
Enter the line-of-fire angle from level. Positive values are uphill and negative values are downhill.
Enter the ambient air temperature at the shooting location. It is used with pressure and humidity to estimate air density.
Enter absolute pressure measured at your location, not a sea-level-corrected weather report value. 29.92 inHg is standard sea-level pressure.
Enter relative humidity from 0 to 100. Its trajectory effect is usually smaller than pressure or temperature but is included in air density.
True with confirmed dope Match the trajectory to real impacts

Range confirmation

Trajectory calibration

Enter the elevation correction that actually centered the group. The regenerated card will honor each confirmed distance.

Confirmed-dope curve is the safest default and changes elevation only. Muzzle-velocity or effective-BC truing changes the physical model and should be used only when the other inputs are verified.

Recommended default. Builds a piecewise elevation curve through every confirmed point without changing calculated velocity, energy, or wind drift.

No calibration is active. Standard model values are being used.

Zero offsetCalculated bullet path relative to the line of sight at the selected zero range. It should be very close to zero.

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Drift at max rangeEstimated horizontal wind displacement at the farthest calculated distance. The sign indicates wind direction.

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Muzzle energyKinetic energy at the muzzle, calculated from bullet weight and muzzle velocity.

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Impact energyEstimated kinetic energy remaining at the maximum chart distance after drag-related velocity loss.

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Distance (yd)Horizontal range from the muzzle in yards. Path (in)Bullet height relative to the line of sight. Positive is above the sight line; negative is below it. Drift (in)Estimated horizontal displacement caused by the entered wind. Elevation (MOA)Signed bullet path expressed in minutes of angle. Use the opposite sign when converting path into a corrective hold or dial. Elevation (MIL)Signed bullet path expressed in milliradians. Use the opposite sign when converting path into a corrective hold or dial. Correction (MOA)Positive elevation hold or turret correction required to center the predicted impact. Confirmed trajectory calibration is reflected here. Correction (MIL)Positive elevation hold or turret correction in milliradians. Confirmed trajectory calibration is reflected here. Velocity (fps)Estimated remaining projectile speed in feet per second. Energy (ft-lb)Estimated remaining kinetic energy in foot-pounds. Time (s)Estimated time of flight from the muzzle to this distance.