Let us walk one classifier all the way from the targets to the percentage that lands on your USPSA card. No magic — just three steps.
Step 1: Add up your points
Score your hits by zone. Shooting Minor, suppose you get 14 Alphas (5 each), 3 Charlies (3 each), and 1 Delta (1), with no penalties:
(14 × 5) + (3 × 3) + (1 × 1) = 70 + 9 + 1 = 80 points
Subtract 10 for every miss or no-shoot, and any procedural penalties, before moving on.
Step 2: Divide by your time
Hit factor is points divided by your total time. If those 80 points came in 12.5 seconds:
80 ÷ 12.5 = 6.40 hit factor
Step 3: Compare to the High Hit Factor
Your classifier percentage is your hit factor divided by that classifier's HHF for your division, times 100. If the HHF is 8.0:
(6.40 ÷ 8.0) × 100 = 80%
That 80% is an A-class run on this classifier. Your classification is then the average of the best six of your most recent eight such percentages.
Skip the calculator
Related reading: What a High Hit Factor (HHF) is · What hit factor you need for your next class
You do not have to run this by hand every time. Log your hit factor and MatchChaser computes the percentage against the current HHF and updates your best-6-of-8 instantly — and it can tell you the hit factor you need next time to hit your goal class. Do the math automatically.