Trading isn't just about picking winners; it's about managing your money and understanding the probabilities. Two crucial concepts that can transform your approach are risk/reward ratios and expectancy.
What is the Risk/Reward Ratio?
The risk/reward ratio is a simple measure that compares the potential profit you aim to make on a trade to the potential loss you're willing to accept. It's often expressed as a ratio, like 1:2 or 2:1.
To calculate it, you first need to define two things for every trade:
- Stop Loss: This is the price level where you'll exit a losing trade to limit your downside. The difference between your entry price and your stop loss is your risk.
- Take Profit: This is the price level where you'll exit a winning trade to secure your gains. The difference between your entry price and your take profit is your reward.
Let's say you're buying a stock at $100. You decide to place a stop loss at $98 and a take profit at $104. Your risk is $2 per share ($100 - $98), and your reward is $4 per share ($104 - $100). Your risk/reward ratio is $2 (risk) to $4 (reward), which simplifies to 1:2. This means for every $1 you risk, you stand to gain $2.
Many successful traders aim for a risk/reward ratio of 1:2 or higher. This means their potential profit on a winning trade is at least double their potential loss on a losing trade.
Why a 2:1+ Reward-to-Risk Ratio is Powerful
It might seem counterintuitive, but you don't need to win most of your trades to be profitable if you consistently maintain a favorable risk/reward ratio. Here's why:
Consider two scenarios:
Scenario 1: High Win Rate, Low Risk/Reward
- You win 70% of your trades.
- On winning trades, you make $1.
- On losing trades, you lose $2 (a 2:1 risk/reward against you).
If you make 10 trades:
- 7 wins x $1 profit = $7 total profit
- 3 losses x $2 loss = -$6 total loss
- Net profit = $1
Even with a high win rate, your overall profit is minimal because your losing trades are much larger than your winning ones.
Scenario 2: Moderate Win Rate, Favorable Risk/Reward
- You win 40% of your trades.
- On winning trades, you make $2 (a 1:2 risk/reward for you).
- On losing trades, you lose $1.
If you make 10 trades:
- 4 wins x $2 profit = $8 total profit
- 6 losses x $1 loss = -$6 total loss
- Net profit = $2
In this scenario, even though you lost more trades than you won, you still ended up with a profit. This demonstrates the power of letting your winners run and cutting your losers short.
Introducing Expectancy
Expectancy takes the risk/reward ratio a step further by incorporating your win rate. It's a single number that tells you, on average, how much you can expect to make or lose per unit of risk over a large series of trades. A positive expectancy means your strategy is likely to be profitable over time.
The formula for expectancy is:
Expectancy = (Win Rate * Average Win Size) - (Loss Rate * Average Loss Size)
Let's re-examine our scenarios using this formula.
Scenario 1 Expectancy (High Win Rate, Low Risk/Reward)
- Win Rate = 70% (0.7)
- Average Win Size = $1
- Loss Rate = 30% (0.3)
- Average Loss Size = $2
Expectancy = (0.7 * $1) - (0.3 * $2)
Expectancy = $0.70 - $0.60
Expectancy = $0.10
For every $1 you risk, you can expect to make $0.10. It's positive, but not very robust.
Scenario 2 Expectancy (Moderate Win Rate, Favorable Risk/Reward)
- Win Rate = 40% (0.4)
- Average Win Size = $2
- Loss Rate = 60% (0.6)
- Average Loss Size = $1
Expectancy = (0.4 * $2) - (0.6 * $1)
Expectancy = $0.80 - $0.60
Expectancy = $0.20
Here, for every $1 you risk, you can expect to make $0.20. This strategy has a better positive expectancy, even with a lower win rate.
Practical Application for Retail Traders
- Define Your Risk Per Trade: Before entering any trade, decide how much capital you are willing to lose if the trade goes against you. This should be a small percentage of your total trading capital.
- Set Your Stop Loss and Take Profit: Based on your analysis, identify logical price levels for your stop loss and take profit. These should reflect the potential movement of the asset.
- Calculate Your Risk/Reward: Ensure your potential reward is significantly greater than your potential risk. Aim for at least 1:2 (meaning your target profit is twice your stop loss amount).
- Track Your Win Rate: Keep a trading journal to record your entry, exit, stop loss, take profit, and the outcome of every trade. Over time, this will give you an accurate picture of your personal win rate.
- Calculate Your Expectancy: Use your actual win rate, average win size, and average loss size to calculate your expectancy. This will tell you if your overall strategy is sound.
By focusing on these metrics, you shift your mindset from simply picking winners to managing probabilities and ensuring that your winning trades more than compensate for your losing ones. It's a fundamental step towards consistent trading.