FPS & Joule / Spring Power Calculator FPS / Joule / m/s Calculator BB Weight (g): 0.20g 0.23g 0.25g 0.28g 0.30g 0.32g 0.36g 0.40g 0.43g 0.45g 0.48g 0.50g Custom Enter Known Value: FPS (feet/sec) m/s (meters/sec) Joule Calculate Spring Power Calculator Spring Power Calculator Select Spring Type: M-rated Spring SP-rated Spring Percentage-rated Spring Select Spring: Select BB Weight (g): 0.20g 0.23g 0.25g 0.28g 0.30g 0.32g 0.36g 0.40g Custom Calculate
