Smart position sizing & risk management

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Risk Management

R-Multiple

A trade's profit or loss expressed as a multiple of the initial risk (R). A 3R trade made 3x what was risked.

What is an R-Multiple?

R-multiple expresses a trade's result in terms of the initial risk. If you risked $100 on a trade and made $300, that's a 3R trade. If you lost the full $100, it's -1R.

Why think in R

  • Normalizes results: compare trades regardless of position size or stock price
  • Expectancy: your average R per trade determines long-term profitability
  • Goal setting: "I need 2R winners" is more useful than "I need $500 winners"

Calculating expectancy

Expectancy = (Win Rate × Avg Win R) - (Loss Rate × Avg Loss R)

A positive expectancy means you're profitable over time. Example: 40% win rate with average 2.5R wins and 1R losses = (0.4 × 2.5) - (0.6 × 1) = 0.4R per trade.

The concept of R-multiples comes from Van Tharp: one of the books recommended on our resources page.