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Power Factor Calculator

Quickly check USPSA/IDPA power factor to make sure your match loads make the cut.

Enter the projectile weight used for official chronograph scoring. Power factor uses bullet weight multiplied by measured velocity.
Use representative chronograph velocity for the ammunition lot. Match officials may use their own sample and chronograph.

Use chronograph data for the lot you plan to compete with.

Power factorBullet weight in grains multiplied by velocity in feet per second, divided by 1,000. —
Reference thresholdsThe calculator displays 125 for Minor and 165 for Major as common reference thresholds. Confirm the current rules for your organization and division. 125 / 165