Free airsoft calculators and tools to tune your setup, stay field-legal, and understand FPS, joules, BB weight and muzzle energy. No sign-up needed — just quick, accurate answers.
FPS to Joule Calculator
Convert FPS and BB weight into joules and foot-pounds, work backwards from a joule limit, and read the full FPS-to-joule chart.
Open tool → ConverterFPS to m/s & mph Converter
Convert airsoft velocity between feet per second, metres per second, mph and km/h in one click.
Open tool → EstimatorSpring to FPS Estimator
Estimate the FPS you can expect from common springs (M90–M170) for AEGs and spring snipers.
Open tool → EstimatorEffective Range Estimator
Estimate effective range from FPS, BB weight and hop-up to plan engagement distances.
Open tool → CalculatorAEG Battery / LiPo Runtime
Work out approximate runtime and rounds from battery voltage and capacity for your AEG.
Open tool → CalculatorRate of Fire (ROF) Calculator
Estimate rounds per second from battery, motor and gear ratio for a tuned AEG.
Open tool →Airsoft FPS & energy guides
Airsoft FPS vs Joules
What each measurement means, how to convert, and which one actually matters for power.
Open →What Is Joule Creep?
Why heavier BBs can raise muzzle energy, and why HPA setups are most affected.
Open →Airsoft BB Weight Guide
Choosing the right BB weight for accuracy, range and consistency on your platform.
Open →Airsoft Chrono Guide
How to chronograph your gun correctly and what BB weight to test with.
Open →Airsoft FPS Limits by Country
Common field and legal limits for CQB, AEG, DMR and sniper platforms by region.
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