Before a trade, three prices define the basic plan: where you enter, where you leave if the idea is wrong, and where you may take profit if it works. The risk/reward ratio compares the distance to that planned loss with the distance to that planned gain.
It is useful because it forces both exits into the conversation before money is at risk. It is limited because price does not owe you either exit, and a target that is far away may be less likely to be reached. Treat the ratio as a planning filter, not a prediction.
What does a 1:2 risk/reward ratio mean?
A 1:2 risk/reward ratio means the planned reward is twice the planned risk. If your loss at the stop would be $100, the target implies a $200 gain. Traders also describe this as risking 1R to pursue 2R.
Check the conventionSome people write reward first and call the same setup 2:1. In this guide, the notation is always risk : reward, so one unit risked for two units of potential reward is 1:2.
How to calculate risk/reward
For a long position, the stop is below the entry and the target is above it:
Risk = Entry − Stop
Reward = Target − Entry
Risk/reward = 1 : (Reward ÷ Risk)
For a short position, the directions reverse:
Risk = Stop − Entry
Reward = Entry − Target
Use the same unit for both sides — dollars per share, points, ticks or total position value. The ratio will be the same before costs.
Example 1: a long stock trade
Imagine a planned long entry at $50, an invalidation point at $48 and a target at $54.
| Part of the plan | Calculation | Result |
|---|---|---|
| Risk per share | $50 − $48 | $2 |
| Reward per share | $54 − $50 | $4 |
| Risk/reward | $2 : $4 | 1:2 |
If your maximum planned loss is $100, the matching size is 50 shares: $100 divided by $2 risk per share. At that size, the stop represents a planned −$100 and the target a planned +$200, before fees, spread and slippage.
Choose the stop before the sizeThe stop should represent where the trade idea is invalidated. Once that distance is known, reduce or increase the number of shares to fit your risk budget. Moving the stop just to afford more shares reverses that logic.
Example 2: a short stock trade
Now imagine a planned short entry at $80, a stop at $84 and a target at $72. The risk is $4 per share and the possible reward is $8 per share, again producing 1:2. With a $100 risk budget, the size would be 25 shares.
The arithmetic is symmetrical, but short selling has additional risks and mechanics. A short position can keep losing as price rises, and borrowing costs or buy-in risk may apply. The ratio does not capture those factors by itself.
How risk/reward connects to win rate
If every loss were exactly −1R and every win exactly the planned reward, the ratio would imply a theoretical break-even win rate:
Break-even win rate = 1 ÷ (1 + reward in R)
| Risk/reward | Reward in R | Theoretical break-even win rate |
|---|---|---|
| 1:1 | 1R | 50.0% |
| 1:1.5 | 1.5R | 40.0% |
| 1:2 | 2R | 33.3% |
| 1:3 | 3R | 25.0% |
These are clean mathematical thresholds, not real-world promises. Costs push the required win rate higher. Partial exits, gaps, skipped trades and closing winners early also make the actual average win and loss different from the plan.
This is why a ratio and a win rate belong together. A strategy winning 30% of the time can work with sufficiently large average wins, while a 70% win rate can still lose if the occasional loss overwhelms many small gains. The fuller measure is expectancy built from your own results.
Planned R and realized R are different
The pre-trade ratio grades the plan. The realized R-multiple grades the outcome against the risk you accepted at entry:
Realized R = Net trade P&L ÷ Initial planned dollar risk
Suppose the long example risked $100. If you close for a net gain of $130, the result is +1.3R — even though the original target was +2R. If a gap produces a $140 net loss, the result is −1.4R rather than the planned −1R.
Recording both values reveals execution patterns. You may discover that 1:3 plans average only +1.1R because profits are routinely cut early, or that planned −1R losses average −1.2R because of slippage. That evidence is more useful than the ratio printed on any single trade ticket.
Why a “good” ratio can still be a bad trade
You can manufacture an impressive ratio on paper by placing the stop very close or the target unrealistically far away. Neither improves the underlying setup. A useful plan needs all three prices to follow a repeatable reason.
- The stop should mark invalidation. Normal price noise should not break the thesis.
- The target should be plausible. Consider the instrument's behavior, time horizon and obstacles between entry and target.
- The position must fit the account. Use size to control dollar risk instead of forcing the chart to fit a desired size.
- The ratio needs historical context. Compare planned and realized R across a meaningful sample of similar trades.
A stop price is not a guaranteed fillA stop order generally becomes a market order when triggered. In a fast market or across a price gap, execution may be materially worse than the stop price. A stop-limit order controls price but may not execute at all.
A practical pre-trade checklist
- Write the entry, invalidation point and target.
- Calculate risk and reward in the same unit.
- Check that the stop and target come from the setup — not from the ratio you want to see.
- Choose position size from your maximum dollar risk.
- Account for likely fees, spread, slippage and gap risk.
- After the exit, record the realized R and the reason for any difference from the plan.
For the wider framework around account risk and sizing, read Risk management 101. To run the numbers quickly, use Sereo's risk/reward calculator.
Key takeaways
- Risk/reward compares the planned loss at your stop with the planned gain at your target.
- A 1:2 plan has a theoretical 33.3% break-even win rate before trading costs.
- An attractive ratio does not measure the probability of reaching the target.
- Track planned and realized R so your journal shows what your execution actually produces.
Sources and further reading
- U.S. SEC Investor.gov: Stop, stop-limit and trailing stop orders
- FINRA: Risks of stop orders during volatile markets
- Fidelity Learn: Exit strategies and target profit/loss ratios
- Charles Schwab: Five elements of a trade plan
Check the plan before you place the trade
Sereo's risk/reward calculator turns entry, stop and target into risk, reward and R:R — then your journal keeps the plan beside the real result.
This article is educational and does not constitute investment advice. Trading involves risk of loss, and you can lose more than you expect. Examples are illustrative. Do your own research and manage your own risk.
