Ballistic Coefficient Calculator

Your details

Form-factor mode is the standard method used for rifle and handgun bullets. Drag-coefficient mode is used when you already know Cd from testing or simulation.
G1 is referenced against a flat-base projectile and is the historical standard. G7 is referenced against a boat-tail projectile and gives more consistent BCs at long range for modern boat-tail bullets.
Enter bullet weight in grains (imperial) or grams (metric).
gr
Bore/bullet diameter in inches (imperial) or mm (metric).
in
The form factor compares the bullet's drag to the reference projectile of the chosen drag model. Values near 1 mean drag similar to the reference; lower values mean more aerodynamic than the reference. Typical G1 form factors: 0.8-1.2 for most rifle bullets. Typical G7 values: 0.9-1.1 for boat-tail bullets.
dimensionless
Ballistic Coefficient (BC)Moderate BC (typical hunting bullet)
0.2409

Higher BC means the bullet retains velocity better and is less affected by wind and gravity over distance.

BC unitslb/in^2
Sectional Density (SD)0.253lb/in^2
Form Factor (i)1.05
Drag modelG1
Mass (lb)0.024lb
0.2409 lb/in^2
Low<0.2Moderate0.2-0.4Good0.4-0.6Very High0.6+

Your ballistic coefficient is 0.2409 lb/in^2.

  • Sectional density is 0.2530 lb/in^2. Higher sectional density means better momentum retention and penetration potential.
  • Form factor 1.050 is close to 1 -- similar drag to the G1 reference projectile.
  • BC is not constant -- it decreases as velocity drops below the transonic threshold (roughly Mach 1.2). Always verify against manufacturer data or chronograph tests at your shooting distances.

Next stepUse this BC as the input for a trajectory calculator to predict bullet drop, wind drift, and retained energy at distance.

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