Risk-Reward Ratio Explained: The Math Behind Profitable Trading
A trader with a 40% win rate can be wildly profitable. A trader with an 80% win rate can go broke. The difference is a number most beginners ignore.
Ask a new trader what their win rate is and they'll have an answer. Ask them what their average risk-reward ratio is and you'll often get a blank stare. This is backwards. Win rate matters, but it's only half the equation. The other half — the half that determines whether your strategy actually makes money — is risk-reward.
What Is a Risk-Reward Ratio?
The risk-reward ratio is the relationship between what you stand to lose on a trade if you're wrong and what you stand to gain if you're right.
If you buy a stock at $100 with a stop at $95 and a target at $115:
- Risk: $100 − $95 = $5
- Reward: $115 − $100 = $15
- Ratio: $15 ÷ $5 = 1 : 3
You're risking one dollar to make three. That's a 1:3 setup. The convention is to express it with risk first ("1 to 3"), though some people flip it. Either way, the larger the second number, the better the trade — at least on paper.
Why Risk-Reward Matters More Than Win Rate
Here's the part most people miss. Your strategy's profitability is determined by the interaction of win rate and risk-reward, not either one alone. The formula for expected profit per trade is:
This is the same math casinos use, just in your favor instead of theirs.
Consider two traders with $100 risked per trade:
| Trader | Win Rate | R-R | Expected per trade |
|---|---|---|---|
| A | 40% | 1 : 3 | (.40 × $300) − (.60 × $100) = +$60 |
| B | 80% | 1 : 0.2 | (.80 × $20) − (.20 × $100) = −$4 |
Trader B wins four times as often as Trader A. Trader B also loses money. Trader A — wrong six trades out of every ten — makes $60 of expected value on every position. After 100 trades, Trader A is up roughly $6,000. Trader B is down $400 and confused about why.
This is why "I just want to be right" is the wrong goal. You want to be profitable. Those aren't the same thing.
Breakeven Win Rate by Ratio
For any given risk-reward ratio, there's a minimum win rate you need just to break even. Below that win rate, you lose money. Above it, you make money.
| R-R Ratio | Breakeven Win Rate | What This Means |
|---|---|---|
| 1 : 1 | 50% | Coin flip — hard to beat consistently |
| 1 : 1.5 | 40% | Achievable for most strategies |
| 1 : 2 | 33% | Standard professional benchmark |
| 1 : 3 | 25% | Trend-following territory |
| 1 : 5 | 17% | Long-shot setups; needs patience |
Notice how forgiving the math gets at 1:3. You can be wrong three trades out of four and still come out ahead. This is why trend-following strategies — which often have brutal win rates — can still print money. The wins, when they come, are large enough to swallow the losses.
What's a "Good" Risk-Reward Ratio?
The honest answer: it depends on your strategy. But there are guidelines.
Minimum: 1:2
Most professional traders won't take a trade with a ratio below 1:2. Below that, the math works against you on any reasonable win rate. You'd need to be right more than half the time, and consistently doing that on real money is harder than it looks.
Sweet spot: 1:2 to 1:3
For active stock traders — swing traders especially — most setups land here. The reward is meaningful, the win rate is achievable, and the math compounds.
Trend-following: 1:5 and higher
If you're trying to catch multi-week or multi-month moves, you'll often have setups where the reward is five or ten times the risk. Win rates on these strategies can be miserable — 20-30% — but the average win is so large it doesn't matter.
The Trap: Forcing the Ratio
Once traders learn about risk-reward, a predictable mistake follows: they start setting profit targets that satisfy the ratio rather than reflecting reality.
If your stop is $2 below entry and you "need" a 1:3 ratio, you set a target $6 above entry. But what if there's heavy resistance at $4 above entry? The price will stall there, retrace, and stop you out — even though the broader move was still in your favor.
The fix is to size the trade around the realistic target, not invent a target around the size. If the chart only offers $4 of upside and you need $2 of stop room, that's a 1:2 trade. Take it or skip it. Don't pretend it's a 1:3.
How to Use Risk-Reward in Practice
Three steps that take 30 seconds:
- Identify the stop level first — based on the chart, not your wallet. Where does your thesis become wrong?
- Identify the realistic target — based on resistance, prior highs, measured moves, or whatever your method dictates.
- Calculate the ratio — if it's below your minimum (typically 1:2), pass on the trade. There will be others.
The discipline of skipping low-ratio trades is what separates traders who get rich slowly from traders who get poor quickly. Over a year, the trades you don't take matter as much as the ones you do.
Use the Calculator
The risk-reward calculator on our home page handles this in a single click — including breakeven win-rate. Plug in entry, stop, and target.
→ Open the risk-reward calculator
The Bottom Line
Risk-reward is the lever that decides whether your strategy survives contact with reality. Win rate fluctuates — strategies have hot streaks and cold streaks, market regimes shift, you'll make mistakes. A solid risk-reward ratio gives you cushion. It lets you be wrong, often, and still come out ahead.
If you're not tracking the average risk-reward of your trades, start. It's the first stat that should appear on any honest trading journal — well above win rate.
Frequently Asked
Is 1:1 a bad risk-reward ratio?
It's borderline. At 1:1, you need above a 50% win rate to be profitable, and that's hard to maintain after fees and slippage. Some scalping strategies work at 1:1, but only because they trade hundreds of times per week. For most traders, 1:1 is too low.
Should I aim for the highest ratio possible?
No. The higher the ratio, the lower your win rate will be — because you're holding for larger moves that often don't complete. There's a sweet spot for every strategy. Backtesting helps you find it.
How does risk-reward relate to position size?
They're complementary, not competing. Position size controls how much you lose if wrong. Risk-reward controls how much you make versus that loss. Use both: position-size every trade to a fixed dollar risk, then only take trades where reward justifies that risk.
What if I don't know my target ahead of time?
Then you can't calculate risk-reward, which is itself a problem. Some discretionary traders use trailing stops instead of fixed targets — that's valid, but it makes pre-trade math harder. At minimum, identify a "minimum acceptable" target before entry.