1. What is a Foot lbs of Energy Calculator?

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

Purpose: It helps shooters, hunters, and ballisticians determine the impact energy of bullets and other 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 to convert to foot-pounds.

3. Importance of Energy Calculation

Details: Energy calculations help determine stopping power, penetration capability, and are often used to compare ammunition performance.

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 is mass measured in grains?
A: Grains are the standard unit for measuring bullet and projectile weights in ballistics (1 grain = 1/7000 pound).

Q2: What's a typical energy range for hunting ammunition?
A: Most big game hunting rounds produce 1,500-3,000 ft-lbs, while small game rounds might be 200-800 ft-lbs.

Q3: Where does the constant 450240 come from?
A: It combines unit conversions (7000 grains per pound) with the gravitational constant (32.174 ft/s²) and the factor of 2 from the kinetic energy formula.

Q4: How do I find bullet velocity?
A: Velocity is typically provided by ammunition manufacturers or can be measured with a chronograph.

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