Level 4: Risk & Money ManagementInteractive
Expectancy: Your Edge Quantified
20 min readUpdated Mar 2026
Expectancy tells you whether your trading system works: on average, how much do you make (or lose) per dollar risked?
Positive = you have an edge. Negative = no amount of discipline saves you.
Expectancy = (Win Rate x Average Win) - (Loss Rate x Average Loss)
Example: 55% win rate, $750 average winner, $400 average loser:
Expectancy = (0.55 x $750) - (0.45 x $400) = $412.50 - $180.00 = +$232.50 per trade
Over 100 trades, that is .
R-based expectancy is independent of position size. It measures system quality, not account size.
Expectancy (R) = (Win Rate x Avg Win R) - (Loss Rate x Avg Loss R)
50% win rate, +2.0R average winner, -1.0R average loser: Expectancy = (0.50 x 2.0) - (0.50 x 1.0) = +0.5R per trade
Expectancy Changes
A strategy might have +0.5R in a trending market but -0.2R in choppy conditions. Monitor ongoing results. Your expectancy from 2 years ago may not reflect current conditions.
You do not need a huge edge. Consistency and frequency multiply small advantages.
This is the casino principle: a tiny edge applied millions of times produces massive cumulative results.
Knowing expectancy is good. Understanding the range of possible outcomes is better.
Monte Carlo runs thousands of random trade sequences with your system's parameters, showing:
Two traders with identical +0.35R systems have very different experiences. One sees steady gains; the other endures a 20% drawdown before recovering. Monte Carlo shows both possibilities so you do not abandon a working system during a normal drawdown.
When comparing strategies, multiply per-trade expectancy by trade frequency:
Lower per-trade expectancy can win if it generates more opportunities.
Key Takeaways
Try This
Calculate your system's expectancy from at least 20 trades (or use hypothetical: 50% win rate, +2R average win, -1R average loss). Note the expectancy, then change win rate to 40% and see how it shifts.
Every trade you log in Swingfolio contributes to your running expectancy calculation. See your edge evolve in real-time.
Start Tracking Your EdgeDisclaimer
This educational content is for informational purposes only and does not constitute financial advice. Past performance is not indicative of future results. Trading involves risk of loss. You should consult a qualified financial advisor before making investment decisions. Swingfolio is a trade journaling tool, not a financial advisory service.