How to Calculate Risk-Reward Ratio for Every Trade

Why the risk-reward ratio matters

Risk management is the backbone of consistent trading. The risk-reward ratio (sometimes called the stop loss take profit ratio) tells you how much you stand to gain for every unit you risk on a trade. Knowing how to calculate it before you enter a position helps you size your position, quantify expected performance, and keep losses manageable.

This article explains the exact formula, gives a step-by-step walkthrough, and shows a concrete worked example with numbers so you can apply the method immediately.

The core formula

• Risk (per share/contract) = Entry price - Stop loss (for a long). For a short trade, Risk = Stop loss - Entry price.
• Reward (per share/contract) = Take profit - Entry price (for a long). For a short, Reward = Entry price - Take profit.

Risk-Reward Ratio = Risk / Reward

Most traders express it as 1:Reward/Risk (e.g., 1:3 means you aim to make 3 units for each 1 unit risked). If Risk-Reward Ratio = 0.33, that's 1:3 (because 1/0.33 ≈ 3).

Stop loss take profit ratio vs. risk-reward ratio

These terms are closely related but used slightly differently:

• Stop loss take profit ratio is the numeric relationship between your stop loss distance and your take profit distance (e.g., stop = $2, target = $6 → ratio 1:3).
• Risk-reward ratio is the same concept but emphasized as a metric used to evaluate the trade before sizing and probability adjustments.

Step-by-step: how to calculate before placing a trade

1. Define your entry price. (Where you will buy or sell.)
2. Decide a stop loss price (the level where you will exit to cut losses).
3. Set a take profit price (the level where you will exit to lock gains).
4. Calculate risk per unit = |Entry - Stop loss|.
5. Calculate reward per unit = |Take profit - Entry|.
6. Compute risk-reward ratio = Risk / Reward; or express as 1:(Reward/Risk).
7. Use the ratio along with your account risk tolerance to size the position.

Position sizing using the ratio

A commonly used rule: risk no more than X% of your total capital on a single trade (many retail traders use 1% or 2%).

Position size (units) = (Account equity × Max risk %) / Risk per unit

This ensures your dollar loss if stopped out stays within your stated tolerance.

Worked example (long trade)

Assume:

• Account equity: $20,000
• Max risk per trade: 1% of account = $200
• Entry price: $50.00
• Stop loss: $47.00
• Take profit: $59.00

Step 1 — Calculate risk per share: Risk = Entry - Stop loss = $50.00 - $47.00 = $3.00 per share

Step 2 — Calculate reward per share: Reward = Take profit - Entry = $59.00 - $50.00 = $9.00 per share

Step 3 — Risk-reward ratio: Risk-Reward Ratio = Risk / Reward = $3 / $9 = 0.333 → expressed as 1:3

Step 4 — Position size: Max dollar risk = $200 Position size (shares) = $200 / $3 ≈ 66.66 → you would buy 66 shares (rounded down)

If the trade hits stop loss you lose ≈ 66 × $3 = $198. If it hits take profit you gain ≈ 66 × $9 = $594.

Observations:

• A 1:3 reward-to-risk means that, even if your win rate is only 30%, you can be profitable over time.
• The important part is combining ratio and realistic win-rate expectations.

Worked example (short trade) — quick walkthrough

Shorting example:

• Entry: $120
• Stop loss: $125 (above entry)
• Take profit: $104

Risk per share = $125 - $120 = $5 Reward per share = $120 - $104 = $16 Risk-Reward Ratio = $5 / $16 = 0.3125 → roughly 1:3.2

Position size based on the same $200 max risk: shares = $200 / $5 = 40 shares.

Interpreting ratios and win rate

A higher reward-to-risk lets you tolerate a lower win rate. Expected return per trade (simplified) can be approximated as:

Expected return = Win rate × Average reward − (1 − Win rate) × Average risk

If your average reward is 3× your risk and your win rate is 35%, expected return per trade = 0.35×3 − 0.65×1 = 1.05 − 0.65 = 0.40 units per unit risk (positive).

This is a simplified model — you should include transaction costs, slippage, and realistic execution in your calculations.

Practical tips

• Always define stop and target before entry; avoid moving stops to avoid losses.
• Use position sizing to cap dollar risk, not a fixed share count.
• Test your approach with historical data or in a simulated environment to estimate your win rate.
• Include commissions, spreads, and slippage when your risk per unit is small; these can materially change the ratio.

Common pitfalls

• Choosing arbitrary risk-reward ratios without regard to market structure. Let support/resistance and volatility inform stops and targets.
• Ignoring correlation across positions — several trades may expose you to the same market risk.
• Using extreme leverage to chase returns; it magnifies both gains and losses.

Not financial advice: the methods above are educational and should be tested on paper before applying real capital. For risk-free practice of these calculations in live market conditions (virtual money), consider AIYUG's free paper-trading race at https://aiyug.us/race.

Bottom line

How to calculate risk-reward ratio is straightforward: compute the per-unit risk and reward, divide risk by reward, and use that ratio alongside your target win rate and max account risk to size trades. The math keeps emotions out of position sizing and helps you plan objectively.