Understanding Risk/Reward Ratios in Trading

A risk/reward ratio (sometimes written R:R) compares the potential loss on a trade to the potential gain. For a given trade, the risk is the maximum amount you stand to lose if the trade goes against you (typically the distance from your entry to your stop-loss). The reward is the amount you stand to gain if the trade reaches your target price.

If a trader enters a stock at $50, sets a stop-loss at $47, and sets a target at $59, the risk is $3 per share (from $50 to $47) and the reward is $9 per share (from $50 to $59). The risk/reward ratio is therefore 1:3 — for every $1 at risk, $3 of potential reward exists.

The ratio is usually expressed with the risk as 1 and the reward as a multiple: 1:2, 1:3, 1:4. A 1:1 ratio means the potential gain equals the potential loss. A 1:0.5 ratio means the potential loss is twice the potential gain — a situation many traders would consider unfavourable.

The risk/reward ratio is most meaningful when considered alongside win rate — the percentage of trades that reach the target before hitting the stop.

A trader with a 1:2 risk/reward ratio (risking $1 to make $2) can be profitable even if they are wrong more often than they are right. At a 1:2 ratio, a trader needs to win only 34% of their trades to break even, ignoring commissions and fees. If they win 50% of trades at a 1:2 ratio, they generate a net profit over time.

Conversely, a trader with a very high win rate but a poor risk/reward ratio — for example, winning 80% of trades but using a 3:1 ratio (risking $3 to make $1) — can still lose money overall. The rare losing trades each cost three times what a winning trade earns.

This relationship is expressed mathematically through the concept of expected value. Expected value is calculated as: (win rate × average reward) minus (loss rate × average risk). A positive expected value means the strategy is theoretically profitable over a large number of trades; a negative expected value means it is not, regardless of how good the win rate appears.

The risk portion of the ratio is defined by the distance between the entry price and the stop-loss level. The stop-loss level is the price at which a trader has decided in advance to exit the trade if it moves against them.

Stop-loss levels are placed at price points that, if reached, suggest the original reason for entering the trade is no longer valid. Common approaches include placing a stop below a recent support level, below a moving average, or at a fixed distance (such as a multiple of the Average True Range) from the entry.

It is important to distinguish between the per-share risk and the total dollar risk. A $3 per-share risk on a 100-share position is a $300 total risk. Position sizing — deciding how many shares to buy — is directly connected to how much total capital the trader is willing to risk on a single trade.

The reward portion of the ratio is defined by the distance between the entry price and the target price — the level at which the trader plans to exit the trade if it moves in their favour.

Target prices are often identified using technical analysis: previous resistance levels, measured moves (where a price pattern implies a minimum upside), Fibonacci extensions, or price targets derived from chart patterns.

One common approach is to set the target as a multiple of the risk. If the risk is $3 per share (from entry to stop), a trader seeking a 1:2 ratio would set the target $6 above the entry. A trader seeking a 1:3 ratio would set it $9 above the entry. This mechanical approach ensures the ratio is built into the trade structure from the outset.

Risk/reward ratios are closely connected to position sizing — deciding how large a position to take on any individual trade. A common educational framework in trading literature is the concept of risking only a fixed percentage of total capital on any single trade, often described as the '1% rule' or '2% rule.'

Under a 2% rule, a trader with a $10,000 account would risk no more than $200 on any single trade. If their stop-loss on a particular trade is $4 below the entry, they would buy no more than 50 shares ($200 ÷ $4 = 50). If their stop is $1 below the entry, they could buy up to 200 shares.

This approach means that a streak of losing trades reduces account size gradually rather than catastrophically. Even ten consecutive losing trades under a 2% rule reduces the account by approximately 18%, not 20% (because each loss is 2% of a progressively smaller account). The same ten losses at 10% risk per trade would reduce the account by approximately 65%.

The concept of asymmetric risk refers to situations where the potential reward substantially exceeds the potential risk — for example, a 1:3 or 1:4 ratio. Traders who seek asymmetric risk structures do so because even a low win rate can be profitable if the winning trades are significantly larger than the losing trades.

Conversely, symmetric risk (1:1 ratios) requires a win rate above 50% to be profitable, and unfavourable ratios (risking more than the potential reward) require an even higher win rate. Many trading educators emphasise seeking asymmetric setups because they provide a mathematical cushion against imperfect win rates.

In practice, achieving consistently favourable risk/reward ratios requires discipline in identifying entry and exit points before placing a trade, and adhering to those levels once the trade is live rather than adjusting them in response to emotions as the price moves.

Risk/reward ratios are a planning tool, not a guarantee of outcomes. The actual risk on any trade can exceed the planned risk if a stop-loss fails to execute at the intended price — for example, due to a gap opening, extreme volatility, or illiquid market conditions as discussed in the section on stop orders above.

Additionally, the ratio only captures the relationship between two prices (entry, stop, target). It does not account for the probability of each outcome occurring — a trade with a 1:5 ratio may have a very low probability of reaching the target and a high probability of hitting the stop, making it a poor trade despite the attractive ratio on paper.

Risk/reward analysis is one input in trade evaluation, not the only input. Other factors — liquidity of the security, broader market conditions, the strength of the underlying thesis, and the trader's own capital and circumstances — all matter.

This guide is educational only and does not constitute financial advice. All examples are hypothetical and for illustrative purposes only. Trading and investing involve substantial risk of loss. Past performance of any strategy or approach does not guarantee future results. Always conduct your own research and consult a qualified financial professional before making investment decisions.