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Free paintball gun FPS calculator for field chronographs. Enter gate spacing in inches and the measured flight time in milliseconds to recover average feet per second, switch to meters per second conversion, or back-solve FPS from joules and paintball mass—with kinetic energy using your weighed ball.
Last updated: April 17, 2026
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Typical .68 cal paintballs are often near 3.0–3.3 g; use your scale or manufacturer data when possible.
Feet per second
299.9 FPS
91.42 m/s · 13.37 J (with 3.2 g)
Chronograph math assumes constant speed between sensors (average over the span), not instantaneous muzzle velocity. Always follow field rules, barrel condoms, and local laws.
Average speed
FPS = ft ÷ s
Exact factor
3.28084×
Classical KE
√(2J/m)
Field caps
Regulatory context
Inputs
Guardrails
Safety
Site chrono wins
6 inch baseline, 1.667 ms flight time, 3.2 g ball (defaults):
≈ 299.9 FPS
13.37 J · 91.42 m/s
In chronograph mode the tool converts your sensor spacing to feet, divides by the elapsed time in seconds, and reports feet per second—the same average-speed definition most gate-style chronographs use. Metric mode multiplies meters per second by the exact foot-per-meter factor. Energy mode applies classical kinetic energy algebra to infer speed from joules and the paintball mass you provide, then reports matching FPS and m/s for comparison shopping across regulations.
FPS = (spacing_in ÷ 12) ÷ (time_ms ÷ 1000)FPS = m/s × 3.280839895…v = √(2J/m) then FPS = v × 3.280839895…Joules use SI mass in kilograms and velocity in meters per second before converting to FPS for display.
Pair with our FPE calculator when you need foot-pound labels for cross-border rule sheets.
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Suggested hashtags: #Paintball #FPS #Chronograph #Calculator #Airball