What is Risk-to-Reward Ratio?
Risk-to-reward ratio (R:R) is one of the most fundamental concepts in trading — yet it's frequently misunderstood or ignored entirely. At its core, R:R measures the relationship between how much you stand to lose on a trade versus how much you stand to gain.
If you enter a stock at $50 with a stop loss at $48, your risk is $2. If your profit target is $56, your reward is $6. Your risk-to-reward ratio is 1:3 — for every dollar you risk, you expect to make three.
R:R is expressed as a simple ratio: 1:2, 1:3, 1:5, and so on. The first number represents the risk (1), and the second number represents the reward (2, 3, 5, etc.). A ratio of 1:3 means your reward is three times your risk.
Why does this matter? Because R:R directly determines how often you need to be right to make money. A trader with a 1:3 risk-to-reward ratio can lose 66% of their trades and still break even. That's the mathematical edge that separates professional traders from gamblers.
How to Calculate Risk-to-Reward
Calculating R:R is straightforward. You need three numbers: your entry price, your stop loss, and your profit target.
Risk = Entry Price − Stop Loss Price
Reward = Target Price − Entry Price
R:R = Risk : Reward
Worked Example
In this example, for every $1 you risk, you stand to gain $3. That means you can afford to be wrong on two out of three trades and still come out ahead. This is the power of a favorable risk-to-reward ratio — it gives you a margin of error.
You can also express R:R as a decimal. A 1:2 ratio is a 2.0 R:R. A 1:3 ratio is a 3.0 R:R. Many traders think in terms of "R" — where 1R equals the amount you're risking on a particular trade.
Why 1:2 is a Common Minimum
Most experienced traders won't take a trade unless they see at least a 1:2 risk-to-reward ratio. Why? Because the math works out in your favour even when your win rate is below 50%.
Consider this: with a 1:2 R:R, you risk $100 to make $200. If you take 10 trades and win only 4 of them (a 40% win rate), you still make money:
Expected Value Formula
(0.40 × $200) − (0.60 × $100) = $80 − $60 = +$20 per trade
Even with a win rate below 50%, a 1:2 R:R makes every trade statistically profitable on average. Over 100 trades, that $20 edge per trade becomes $2,000 — assuming you're disciplined enough to maintain the ratio.
This is why professional traders obsess over R:R. It's not about being right on every trade — it's about making sure that when you win, you win enough to more than cover your losses.
Risk-to-Reward and Win Rate
There's a direct mathematical relationship between your risk-to-reward ratio and the win rate you need to be profitable. Understanding this relationship is crucial for setting realistic expectations.
The formula for the minimum win rate to break even at a given R:R ratio is:
Required Win Rates by R:R Ratio
| R:R Ratio | Min Win Rate | Difficulty |
|---|---|---|
| 1:1 | 50.0% | Hard — need 50%+ wins |
| 1:2 | 33.3% | Moderate — reasonable target |
| 1:3 | 25.0% | Easier — strong edge |
| 1:4 | 20.0% | Favourable — swing trading |
| 1:5 | 16.7% | Very favourable — trend following |
The takeaway is clear: the higher your risk-to-reward ratio, the less often you need to be right. A 1:3 R:R only requires you to win 25% of the time to break even — and anything above that is profit.
Of course, higher R:R ratios are harder to achieve in practice. Setting a 1:5 target means the price has to move significantly in your favour, which doesn't happen on every trade. The key is finding a balance between realistic targets and favourable ratios that matches your trading style.
Day traders often work with tighter ratios (1:1.5 to 1:2) because they're taking many trades per day. Swing traders can demand higher ratios (1:3 to 1:5) because they hold fewer, more selective positions. Neither approach is wrong — it's about knowing what your strategy can realistically achieve.
Practical Application
Knowing the theory is one thing — applying it in real-time trading is another. Here's how to use R:R practically when evaluating and managing trades.
Set Your Minimum R:R Before Entry
Decide your minimum acceptable R:R before you place a trade. If your strategy typically targets 1:2, don't talk yourself into a 1:1 setup because it "feels right." Emotional decisions destroy edges. Stick to your rules.
Only Take Trades With Favourable R:R
If you can't see a clear path to your target with a stop loss that makes sense, the trade probably isn't worth taking. No setup, no matter how compelling, is worth a poor R:R. Walk away and wait for better opportunities.
Adjust Stops and Targets Together
Moving your stop loss further away to "improve" R:R is dangerous — you're just increasing your risk. Instead, look for setups where the natural structure of the market gives you a tight stop and a realistic target. Use support/resistance levels, not arbitrary distances.
Combine R:R With Position Sizing
R:R and position sizing work together. Once you know your R:R, use a Position Size Calculator to determine exactly how many shares to buy based on your account size and risk tolerance. This removes guesswork from every trade.
Common Mistakes
Even traders who understand R:R theory often make these critical mistakes in practice.
Taking Poor R:R Trades
Entering a 1:1 or worse setup because you're bored, impatient, or chasing a move. Every trade below your minimum R:R erodes your edge over time.
Moving Targets Further Away
Unrealistically extending your profit target to make the R:R look better on paper. A 1:5 target that never gets hit is worse than a 1:2 target that hits regularly.
Ignoring Commissions and Slippage
Your R:R calculation should account for trading costs. A theoretical 1:2 ratio can quickly become 1:1.5 once commissions, spreads, and slippage are factored in — especially on smaller positions.
Chasing After the R:R Changes
Waiting too long to enter and chasing a stock that's already moved. The R:R that looked great at $50 looks terrible at $53 — your stop is the same but your potential reward is now smaller. If the window closes, let it go.
Key Takeaways
R:R measures potential loss against potential gain — it's the single most important metric for evaluating whether a trade is worth taking.
A 1:2 minimum is a sensible baseline — it means you can be wrong more than half the time and still be profitable.
Higher R:R requires a lower win rate — a 1:3 ratio only needs a 25% win rate to break even.
Combine R:R with position sizing — use the Position Size Calculator to determine your exact entry based on risk tolerance.
Discipline is everything — the math only works if you consistently maintain your R:R across every trade.
Put R:R Into Practice
Now that you understand risk-to-reward, use our free Position Size Calculator to calculate your exact entry, stop, and position size based on your account and risk tolerance.
Position Size Calculator