Risk/Reward Ratio: How to Calculate It and Why It Determines Your Profitability

What Is the Risk/Reward Ratio?

The risk/reward ratio (also written as R:R or R/R) compares how much you stand to lose on a trade versus how much you stand to gain. A 1:2 risk/reward means you risk $1 to make $2. A 1:3 means you risk $1 to make $3.

It is the most fundamental concept in trading, yet it is the one most consistently ignored by losing traders. Professional traders optimize every trade around this number before entry. Losing traders optimize around whether the stock is going to go up.

In Barber, Lee, Liu, and Odean's 2014 study of Taiwanese day traders from 1992–2006, fewer than 1% showed reliably positive abnormal returns after fees when prior-year performance was evaluated in the following year. This is a historical finding about that market and sample, not a six-month or five-year survival rate, a forecast for today's traders, or evidence that a checklist, backtest, or psychological discipline causes profitability.

How to Calculate Risk/Reward Ratio

The formula is simple:

Risk = Entry price − Stop loss price Reward = Target price − Entry price R/R Ratio = Risk ÷ Reward

Example Calculation

You buy NVDA at $140.00. Your stop loss is at $138.00. Your target is $144.00.

• Risk: $140.00 − $138.00 = $2.00 per share
• Reward: $144.00 − $140.00 = $4.00 per share
• Risk/Reward: $2.00 ÷ $4.00 = 0.5, which is 1:2

A 1:2 ratio means for every $1 you risk, you expect to make $2 if the trade works. This is expressed as R/R = 1:2.

Why Risk/Reward Ratio Matters More Than Win Rate

Here is the counterintuitive truth that separates professional traders from hobbyists: you can be profitable with a 40% win rate if your risk/reward ratio is good enough.

Expectancy = (Win Rate × Average Win) − (Loss Rate × Average Loss)

The trader with a 40% win rate and 2.5R average wins earns MORE per trade than the trader with a 60% win rate and equal wins and losses. Most retail traders obsess over win rate because it feels good to be right often. Professionals obsess over expectancy because it determines the bank account balance.

What Risk/Reward Ratio Should You Target?

For day trading, a minimum of 1:2 (risking $1 to make $2) is the baseline most professional traders require before entering a trade. Many experienced day traders require 1:3 or better.

Why 1:2 minimum?

At 1:2, you only need to win 34% of your trades to break even (before commissions). That gives you a large margin for error. At 1:1, you need a 50%+ win rate just to break even, and after commissions, you need 55%+. Most retail traders cannot consistently hit 55%+ win rate, which is why 1:1 traders consistently lose money.

Practical guidelines by strategy type:

• Momentum breakouts: Target 1:3 to 1:5. High momentum setups that fail tend to fail fast, so stops can be tight and targets can be wide.
• Mean reversion: Target 1:2 to 1:3. These moves are more predictable in magnitude but require patience.
• Scalping: Even 1:1.5 can work if win rate is high (65%+) and commissions are negligible.
• Swing trades (multi-day): Target 1:3 or better. You’re holding overnight risk, so the reward must justify it.

How to Set Stop Loss and Target to Achieve Your R/R

Most traders set their stop loss first (based on chart structure), then calculate whether the natural target provides adequate R/R. If it doesn’t, they skip the trade.

Setting the Stop Loss

Your stop loss should be placed at the level where your trade thesis is invalidated — not at an arbitrary dollar amount below your entry. Common stop loss placement methods:

• Below the recent swing low (for long trades): If the stock breaks below the last significant low, the uptrend thesis is broken.
• Below a key technical level: Below VWAP, below a major moving average, below a support level.
• ATR-based stop: Place the stop 1× or 1.5× the Average True Range below entry. This adjusts for the stock’s normal volatility.

Setting the Target

Targets should be set at the next significant resistance level, not at a round number or arbitrary percentage. Common target placements:

• Previous day high or low
• Key pivot levels (see Pivot Point Trading Strategy)
• VWAP extended targets (see VWAP Trading Strategy)
• ATR-projected move: Entry + 2× ATR for a standard momentum target

If the chart doesn’t show a clear resistance level at 2× your stop distance, the trade does not meet minimum R/R requirements. Skip it.

The Relationship Between R/R and Position Sizing

R/R ratio determines the structure of the trade. Position sizing determines how much capital you allocate. They work together.

Standard workflow:

1. Identify entry and stop loss levels from the chart
2. Calculate risk per share (entry − stop)
3. Determine maximum dollar risk per trade (e.g., 1% of account = $150 on a $15,000 account)
4. Position size = Dollar risk ÷ Risk per share = $150 ÷ $2.00 = 75 shares
5. Verify target is at least 2× the stop distance away for 1:2 R/R
6. If not, find a tighter stop level or skip the trade

This workflow ensures consistent risk regardless of stock price, volatility, or setup type.

Improving Your Risk/Reward Ratio

If your trades consistently generate poor R/R, these are the most common fixes:

Tighten entries: The biggest source of poor R/R is entering trades late, after significant move, forcing you to use a wide stop to avoid noise. Earlier entries — on the breakout candle rather than after the breakout is confirmed — give you a tighter stop and therefore better R/R.

Use structure-based stops, not percentage stops: “I always use a 1% stop” is a losing approach. The stop belongs where the thesis is invalidated, not at a fixed distance. A 1% stop on a high-volatility stock will get taken out by normal noise. A structure-based stop places it beyond the last swing low, which holds until the thesis actually breaks.

Be selective about targets: If your natural target is only 1.5× your stop distance, the trade is marginal. Wait for setups where the chart shows a clear reason to expect a larger move — a breakout to a clean level, a gap fill, or a measured move target.

Track R/R in your trading journal: Log planned R/R before entry and realized R/R after exit. Patterns emerge: you may find that your setups have excellent planned R/R but you close early, capturing only 1:1 instead of 1:3. That is an exit discipline problem, not a setup problem. See Trading Journal Template for how to track this systematically.

Risk/Reward in Automated Trading Systems

Algorithmic trading systems enforce R/R mathematically, which is one of their core advantages over manual trading. A well-designed automated system will:

1. Calculate R/R for every candidate trade before placing any order
2. Reject trades below the minimum threshold (e.g., 1:2)
3. Set stop loss and target orders simultaneously at entry
4. Do not widen the stop after entry to avoid a loss; trailing it in the trade's favor once the position is working is a separate, rule-based decision

Tradewink’s AI day trading system applies this same discipline in Paper Autopilot (Tradewink's public offering is paper trading only). Every trade candidate is evaluated for R/R using ATR-based stops and technical-level targets (minimum about 1.8:1) before a paper order can be submitted. Trades that don’t meet the minimum threshold are filtered out regardless of how strong other signals appear. Paper stops may trail in the trade’s favor.