BC CALCULATOR

Calculates ballistic coefficient (BC) from two measured velocities, V1 and V2, and the distance between the chronograph positions.

Inputs

TXT report: settings, result and table.

Name / Description

Units

Drag model

Velocity V1 (nearer the muzzle)

m/s

Velocity V2 (farther downrange)

m/s

Distance between velocity measurements (V1 → V2)

Projectile weight

Sight height

Zero range

“Zero range” is the selected point where the projectile trajectory crosses the line of sight. The calculator sets the bore angle so the projectile intersects the line of sight at the entered range, then finds both crossings: ZERO 1 (near zero) and ZERO 2 (far zero).

Maximum range

Range interval

Air temperature (°C)

Relative humidity (%)

Station pressure / altitude

Scope — elevation turret

Click value

Correction distance

Required elevation
+ UP / − DOWN

— clicks

—

A positive value means dial the elevation turret UP; a negative value means dial DOWN. Table values are calculated from the POI and range in each row.

Calculated ballistic coefficient

— lb/in²

Charts

+ rise ↑ · − drop ↓

Downrange velocity, energy and POI

POI: − indicates impact below the line of sight; + indicates impact above it.

Range from V1 [ m ]	Velocity [ m/s ]	Energy [ J ]	POI [ cm ]	Clicks