1. What is the Foot-Pounds Calculation?

The Foot-Pounds calculation measures the kinetic energy of a projectile based on its weight and velocity. It's commonly used in ballistics to compare the stopping power of different ammunition types.

2. How Does the Calculator Work?

The calculator uses the Foot-Pounds formula:

Where:

• \( Weight \) — Projectile weight in grains
• \( Velocity \) — Projectile velocity in feet per second (fps)
• 450240 — Conversion factor (2 × gravitational acceleration × 7000 grains per pound)

Explanation: The equation calculates kinetic energy by accounting for both the mass and velocity of the projectile, with the velocity contributing exponentially more to the energy.

3. Importance of Foot-Pounds Calculation

Details: Foot-pounds energy is crucial for understanding a projectile's potential impact and effectiveness, particularly in hunting and self-defense scenarios.

4. Using the Calculator

Tips: Enter projectile weight in grains and velocity in feet per second. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why use grains for weight measurement?
A: Grains are the standard unit for measuring bullet and projectile weights in ballistics.

Q2: What is a typical foot-pounds value for handguns?
A: Common handgun rounds range from 200-600 ft-lbs, while rifle rounds can exceed 3000 ft-lbs.

Q3: How does velocity affect the energy?
A: Since velocity is squared in the equation, doubling the velocity quadruples the energy.

Q4: What's the minimum energy for hunting?
A: Most states recommend at least 1000 ft-lbs for deer hunting, with larger game requiring more.

Q5: Can this be used for arrows?
A: Yes, though arrows are typically measured in grains for weight and fps for speed, the same calculation applies.