Power factor calculator

Power factor is bullet weight in grains multiplied by velocity in feet per second, divided by 1000 — and in USPSA a load makes major at 165 and minor at 125. Enter a weight and a velocity and this returns the number and which side of both lines it lands on. Enter a load and this works out the number and tells you which side of the line it lands on.

By Michael Minik. Sources are linked in the text if you want to check them yourself.

USPSA drops the decimals rather than rounding them, so a load that computes just under the line misses it — and when yours does, this says so rather than leaving you to work out why. (Divisions that always score minor are named below the result.)

Your calculator entries are remembered only in your own browser — no number you enter into these calculators is ever sent anywhere. A “Copy a link” button puts your entered numbers in the link itself, which is what makes a result shareable. Two things at the foot of this page DO send what you put in them, because that is what they are for: the “Spot a mistake?” box sends your message and, if you add one, your email address; the launch-list box sends your email address. What happens to either is on the privacy page.