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What Is Expectancy in Trading?

The Big Idea

Expectancy is the average amount of money you make (or lose) per trade over the long run. It’s the most important number in trading because it tells you if your strategy actually works.

Think of it like a vending machine. Every time you put in a dollar, you get something out. Maybe sometimes you get candy, sometimes you get nothing. If the AVERAGE result is that you come out ahead, the machine is a money-maker. If the average is losing money, the machine is a money-taker.

Trading is the same. Your strategy is the vending machine. Your trades are each dollar you put in. The expectancy tells you whether the machine is paying you or eating your money.

How to Calculate Expectancy

The simple formula looks like this:

Expectancy = (Win Rate × Average Win) – (Loss Rate × Average Loss)

Let’s break it down:

Example

Let’s say over 100 trades:

Expectancy = (0.40 × $300) – (0.60 × $100)

Expectancy = $120 – $60

Expectancy = $80 per trade

This means on average, every trade you take makes you $80. Even though you lose more often than you win!

Over 100 trades, that’s $8,000. Over 500 trades, that’s $40,000. Expectancy is how profitable your strategy is at its CORE.

Positive vs Negative Expectancy

Positive Expectancy

Your average trade makes money. Congratulations! You have an edge. Keep trading. Over many trades, the profits will add up.

Negative Expectancy

Your average trade LOSES money. You do NOT have an edge. If you keep trading, you’ll keep losing. Period. More trades mean more losses.

Zero Expectancy

On average, you break even. You’ll bounce between small wins and small losses forever. Costs like spreads and commissions will eventually grind your account down.

Your job as a trader is to develop a positive expectancy strategy. Nothing else matters more than this.

The Relationship with Win Rate

Here’s a huge lesson. You can have a positive expectancy with a LOW win rate, if your average win is big enough.

Example: 30% win rate, but average win is 5x average loss:

Expectancy = (0.30 × $500) – (0.70 × $100) = $150 – $70 = +$80 per trade

See? Even winning only 30% of the time, this strategy is profitable because the wins are much bigger than the losses.

Now look at the opposite – high win rate but tiny wins:

Expectancy = (0.80 × $50) – (0.20 × $300) = $40 – $60 = -$20 per trade

This strategy wins 80% of the time but STILL LOSES MONEY. Because the few losses are way bigger than the many wins.

This is why win rate alone doesn’t tell you anything useful. Expectancy tells you the full story.

R-Expectancy (Expectancy in R Terms)

Many pro traders measure expectancy in “R” instead of dollars. R is your risk per trade. A +2R trade made 2x what you risked. A -1R trade lost exactly what you risked.

This lets you compare strategies across different position sizes.

Example in R

Over 100 trades:

This means you average 0.60R profit per trade. If you risk $100 per trade, you average $60 per trade. If you risk $1,000 per trade, you average $600 per trade. The R number is consistent regardless of size.

Good R-expectancies:

Why Expectancy Matters

Reason 1: It Tells You if You Have an Edge

Positive expectancy = you have an edge. Negative = you don’t. It’s that clear. No ambiguity.

Reason 2: It Helps You Choose Strategies

Backtesting a strategy? Look at expectancy. The one with the highest POSITIVE expectancy is probably the best choice.

Reason 3: It Sets Realistic Expectations

If your expectancy is +0.3R per trade and you take 50 trades a month, you can expect to make about 15R per month. That sets realistic goals.

Reason 4: It Reveals Problems Early

If your expectancy drops from +0.5R to +0.1R, something changed. Maybe the market. Maybe your discipline. Either way, you spot it before your account gets destroyed.

How Many Trades Do You Need?

Expectancy only matters over MANY trades. A single trade, or even 10 trades, tells you nothing. You need enough trades for randomness to cancel out.

Rough guidelines:

A strategy with +0.5R expectancy might lose for 20 trades in a row by bad luck. That’s normal. Don’t panic and change strategies based on small samples.

Common Mistakes Beginners Make

Mistake 1: Focusing Only on Win Rate

“I win 70% of my trades! I must be great!” Not if your losses are huge. Always include win SIZE and loss SIZE in the analysis.

Mistake 2: Judging Strategies Too Fast

“This strategy lost twice. Must not work.” 2 trades tells you nothing. Give it at least 50-100 trades before deciding.

Mistake 3: Ignoring Costs

Your real expectancy needs to include commissions, spreads, and fees. A strategy that’s +0.3R gross might be -0.1R after costs.

Mistake 4: Not Tracking Enough to Calculate It

You can’t calculate expectancy without data. This is why a trading journal is essential. Without it, you’re guessing.

Mistake 5: Mixing Strategies

If you trade three different setups, calculate expectancy for EACH SEPARATELY. Otherwise, you won’t know which setup is your winner and which is dragging you down.

The Big Picture

Expectancy is the “bottom line” of trading. Everything else (entry rules, exit rules, indicators, emotions) only matters because they affect expectancy. It’s what separates profitable traders from unprofitable ones.

Here’s what to remember:

A wise trader once said: “Amateurs count wins. Professionals count R.” The pros know that win rate is a vanity metric. Expectancy is where the money lives.

If you remember only one thing from this article: start tracking enough data to calculate your expectancy. Without that number, you’re trading blind. With it, you know exactly how profitable you are and what to improve.

Related Terms

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Focus on the process. Trust the stats. Stay consistent.