Enter your bullet weight, diameter, and drag function into the calculator to determine the ballistic coefficient (BC).

Ballistic Coefficient Calculation Formula

The following formula is used to calculate the ballistic coefficient (BC) of a bullet.

BC = (Bullet Weight / (Bullet Diameter * Bullet Diameter)) * Drag Function Factor

Variables:

  • BC is the ballistic coefficient, a measure of a bullet’s ability to overcome air resistance.
  • Bullet Weight is the weight of the bullet in grains.
  • Bullet Diameter is the diameter of the bullet in inches.
  • Drag Function Factor varies based on the drag function used (G1 or G7).

To calculate the BC, divide the bullet weight by the square of the bullet diameter and multiply by the drag function factor.

What is Ballistic Coefficient?

The ballistic coefficient (BC) is a numerical representation of a bullet’s ability to maintain velocity in flight and resist wind drift. A higher BC indicates a more aerodynamic bullet that will perform better over long distances. Understanding BC is crucial for shooters who want to improve accuracy and performance.

How to Calculate Ballistic Coefficient?

The following steps outline how to calculate the ballistic coefficient using the given formula.

  1. First, determine the bullet weight in grains.
  2. Next, measure the bullet diameter in inches.
  3. Select the appropriate drag function (G1 or G7).
  4. Use the formula from above: BC = (Bullet Weight / (Bullet Diameter * Bullet Diameter)) * Drag Function Factor.
  5. Finally, calculate the BC by plugging in the values.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Bullet Weight = 150 grains

Bullet Diameter = 0.308 inches

Drag Function = G1

FAQ

1. What is ballistic coefficient?

Ballistic coefficient is a measure of a bullet’s ability to overcome air resistance and maintain velocity in flight.

2. How does BC affect shooting performance?

A higher BC means less drop and drift, resulting in better accuracy over long distances.

3. Can I use this calculator for different bullet types?

Yes, you can input different bullet weights and diameters to calculate the BC for various bullet types.

4. Is the calculator accurate?

The calculator provides an estimate of the ballistic coefficient based on the inputs provided. For precise measurements, consult ballistic data from manufacturers.

5. How often should I use the ballistic coefficient calculator?

It’s helpful to use the calculator whenever you change bullet types, weights, or when optimizing your shooting setup.