Firearm Power Factor Calculator

Formula

To calculate the power factor (PF):

\[ \text{PF} = \frac{\text{W} \times \text{V}}{1000} \]

Where:

\(\text{PF}\) is the Power Factor (gr-fps)
\(\text{W}\) is the bullet weight (grains)
\(\text{V}\) is the velocity (fps)

What is Power Factor?

The power factor is a measure of the momentum of a bullet, calculated by multiplying the bullet weight by its velocity and then dividing by 1000. It is commonly used in shooting sports to ensure fair competition by standardizing the impact energy of different ammunition.

Example Calculation 1

Let's assume the following values:

Bullet Weight (\(\text{W}\)) = 200 grains
Velocity (\(\text{V}\)) = 900 fps

Using the formula:

\[ \text{PF} = \frac{200 \times 900}{1000} = 180 \]

The Power Factor is 180 gr-fps.

Example Calculation 2

Let's assume the following values:

Bullet Weight (\(\text{W}\)) = 150 grains
Velocity (\(\text{V}\)) = 1200 fps

Using the formula:

\[ \text{PF} = \frac{150 \times 1200}{1000} = 180 \]

The Power Factor is 180 gr-fps.