The one-paragraph version
Cost Per Nut (CPN) divides your total dating spend by the number of times you got a defined outcome over the same period. It's a back-of-the-envelope ROI for your dating life. Lower usually means more efficient. Higher usually means you're paying a lot for what you're getting.
Why it caught on
CPN makes a fuzzy, emotional, easily-rationalized kind of spending suddenly concrete. Most guys carry a rough idea of what dating costs them. Running the numbers replaces that idea with a real figure, and the gap between the two is the point.
It's also funny. The math is simple, the conclusion is sometimes brutal, and that combination travels well online.
Computing your own
Pick a period (a month works). Add up every dating-related dollar you spent in it, and don't undercount. Count your outcomes. Divide. That's your CPN for the period.
If the number surprises you, that's normal. Small costs like ubers and pre-drinks are easy to forget.
Using the number
The number is information. What you do next is up to you: drop a venue tier, try earlier dates, cut transport, or have an honest look at the girl with the highest CPN. Track another month and see what moves.
Treat CPN as a signal, not a verdict. It doesn't decide who you date. It shows you the data you'd otherwise ignore.
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