Airsoft FPS to Joule Calculator

Airgrix field tool

Convert muzzle velocity to kinetic energy using the BB weight you actually chrono with. Compare common BB weights and estimate the velocity at a field joule limit.

Calculate energy

Enter chronograph velocity and BB mass.

Velocity (FPS)

BB weight (grams)

—joules

— m/s

Equivalent velocity table updates with energy

BB weight	Equivalent FPS	Equivalent m/s

FPS at a joule limit

Estimate the maximum velocity for a chosen energy limit and BB weight.

Energy limit (J)

BB weight (grams)

—FPS

— m/s

This is a mathematical estimate, not a field approval. Always check the event's stated limit and testing procedure.

Formula: joules = ½ × mass in kilograms × velocity in metres per second squared. Conversion: 1 FPS = 0.3048 m/s. Values are rounded for display.