Purpose: 1) to analyze the reliability and validity of a field computation method based on easy-to-measure data to assess the mean force (F̅) and velocity (v̅) produced during a ballistic bench press movement; and 2) to verify that the force-velocity (F-v) profile obtained with multiple loaded trials is accurately described. Methods: Twelve participants performed ballistic bench press against various lifted mass from 30 to 70% of their body mass. For each trial, F̅ and v̅ were determined from an accelerometer (sampling rate: 500Hz; reference method) and a simple computation method based on upper limb mass, barbell flight height and push-off distance. These F̅ and v̅ data were used to establish the F-v relationship for each individual and method. Results: A strong to almost perfect reliability was observed between the two trials (ICC>0.90 for F̅ and 0.80 for v̅ , CV% < 10%) whatever the considered method. The mechanical variables (F̅ , v) measured with the two methods, and all the variables extrapolated from the F-v relationships were strongly correlated (r² > 0.80, p < 0.001). The practical differences between the two methods for the extrapolated mechanical parameters were all <5% indicating "very probably no differences". Conclusion: The present findings suggest that the simple computation method used here providing valid and reliable information on force and velocity produced during ballistic bench press, in line with those observed in laboratory conditions. This simple method is then a practical tool, which necessitates only three simple parameters (upper limb mass, barbell flight height and push-off distance).