Airsoft BB Performance Visualizer

A self-contained browser tool for estimating airsoft BB performance from chronograph velocity, BB weight, drag, muzzle angle, hop-up lift estimate, and target distance.

Open FPS_Visualizer.html directly in a browser. It has no build step and no CDN dependency.

What It Calculates

• Muzzle energy in joules.
• Equivalent FPS for 1 joule at the selected BB weight.
• Estimated max range until the simulated BB reaches ground height.
• Estimated useful range until impact energy falls below the selected threshold.
• Speed, energy, drop, and flight time at common distances.

Model

The exact energy calculation is:

E = 1/2 * m * v^2

Where:

• E is kinetic energy in joules.
• m is BB mass in kilograms.
• v is BB speed in meters per second.

The flight model uses quadratic drag:

Fd = 1/2 * rho * Cd * A * v^2

Where:

• rho is air density.
• Cd is drag coefficient.
• A is BB cross-sectional area.
• v is speed through air.

The simulation assumes a 6 mm spherical BB, default air density of 1.225 kg/m3, and default sphere drag coefficient of 0.47. It integrates the BB path in small time steps with gravity and drag.

Hop-up lift is represented as an adjustable reduction in effective gravity. That makes the math visible instead of hiding backspin behavior inside a fake range formula. Real hop-up behavior depends on BB surface quality, bucking, barrel, spin rate, wind, and setup consistency, so this should be treated as an estimate.

Verification Sources

• Kinetic energy formula: OpenStax University Physics, kinetic energy
• Drag equation: NASA Glenn Research Center, modern drag equation
• Standard sea-level density reference: U.S. Standard Atmosphere 1976

Important Caveat

Do not use this as field-limit authority. Always chronograph with the field-required BB weight and rules. This tool is for quick performance estimates and comparisons.