1. What is a Kinetic 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, ballisticians, and hunters determine the stopping power and energy transfer of projectiles.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Kinetic energy (foot-pounds)
• \( m \) — Mass of projectile (grains)
• \( v \) — Velocity of projectile (feet per second)

Explanation: The formula calculates the energy by multiplying mass by velocity squared, then dividing by the conversion factor 450240 which accounts for unit conversions.

3. Importance of Kinetic Energy Calculation

Details: Kinetic energy determines a projectile's stopping power, penetration capability, and effectiveness for hunting different game sizes.

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

Q2: What's the significance of 450240 in the formula?
A: This constant converts grains and ft/s to foot-pounds (7000 grains/lb × 64.32 ft/s² ÷ 2).

Q3: What's considered good kinetic energy for hunting?
A: Generally: 1000 ft-lbs for deer, 1500 ft-lbs for elk, and 2000+ ft-lbs for large/dangerous game.

Q4: Does this account for air resistance?
A: No, this calculates muzzle energy only. Actual downrange energy will be lower due to drag.

Q5: How do I measure bullet velocity?
A: Use a chronograph device at the shooting range for accurate velocity measurements.