1. What is Kinetic Energy in Foot-Pounds?

Definition: This calculator estimates the kinetic energy of a projectile in foot-pounds based on its mass and velocity.

Purpose: It helps firearms enthusiasts, ballistics professionals, and hunters determine the stopping power and energy of projectiles.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy (foot-pounds)
• \( m \) — Mass (grains)
• \( v \) — Velocity (feet per second)

Explanation: The formula calculates kinetic energy by multiplying mass by velocity squared, then dividing by the constant 450240 which converts grains and ft/s to ft-lbs.

3. Importance of Kinetic Energy Calculation

Details: Understanding projectile energy helps in assessing stopping power, penetration capability, and effectiveness for different hunting or shooting applications.

4. Using the Calculator

Tips: Enter the projectile mass in grains and velocity in feet per second. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

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

Q2: Where does the constant 450240 come from?
A: It's a conversion factor that accounts for unit conversions (grains to pounds and dimensional analysis) to get foot-pounds.

Q3: What's a typical energy range for hunting?
A: Small game: 100-400 ft-lbs, Medium game: 800-1500 ft-lbs, Large game: 1500+ ft-lbs.

Q4: How do I find bullet velocity?
A: Use a chronograph to measure actual velocity or consult ammunition manufacturer specifications.

Q5: Does this account for air resistance?
A: No, this calculates muzzle energy. Actual downrange energy will be less due to air resistance.