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Risk/Reward – Win Rate
Lot Size Calculator
A Risk–Reward Win Rate Calculator is a tool that helps traders understand the balance between how much they risk on each trade compared to how much they aim to gain, and how often they need to win to stay profitable. It works by combining the size of your average risk (for example, the distance to your stop-loss) with the size of your average reward (the distance to your take-profit). From these inputs, the calculator shows the “win rate” required to break even and how profitable a strategy could be over time.
For instance, if you risk $100 on a trade and aim to make $200, your risk–reward ratio is 1:2. In this case, you only need to win 34% of the time to break even. If the ratio were flipped — risking $200 to make $100 — you would need to win at least 67% of the time just to avoid losses.
Traders use this calculator to check whether their trading plan is realistic and sustainable. It brings clarity to the relationship between risk, reward, and consistency, allowing them to adjust position sizing, stop-loss, and take-profit levels more intelligently. In short, it answers the question: “Given my risk and reward setup, how often do I need to win to make money?”
