Risk Reward Calculator

What is a risk/reward calculator?

A risk/reward calculator is a tool that estimates the ratio between stop-loss risk and take-profit reward, plus the breakeven win rate. Enter entry, stop, and target — this page does not place trades.

This is an estimate from the prices you enter — not trading or investment advice.

The Math Behind Profitable Trading

The secret to profitable trading isn't having a 90% win rate. It's having positive expectancy. Positive expectancy is created when your Risk/Reward (R:R) ratio is sized to offset your win rate under the assumptions you model.

The Risk/Reward ratio simply compares how much money you stand to lose if your Stop Loss is hit, versus how much money you stand to make if your Take Profit is hit. A 1:2 R:R means you risk $100 to make $200.

How the Breakeven Win Rate Works

When your Risk/Reward ratio changes, the mathematical win rate required just to avoid losing money changes drastically:

• 1:1 Ratio: You must win 50% of your trades to break even.
• 1:2 Ratio: You must win 33% of your trades to break even.
• 1:3 Ratio: You must win 25% of your trades to break even.
• 1:5 Ratio: You must win 17% of your trades to break even.

This means if you consistently plan a 1:3 ratio and fills match those levels, the breakeven math allows for being wrong on about 7 of 10 trades — real fills and sizing can still miss that.

Why Retail Traders Fail

Retail traders often boast about a 90% win rate. The problem? They are scalping 2 points of profit but holding losing trades for 20 points before cutting the cord.

If your average win is $20 and your average loss is $200, your Risk/Reward ratio is 1:0.1. At that ratio, you need about a 91% win rate just to break even under those averages. The moment market volatility shakes you out, that math makes blowing the account highly likely.

Who Is This For?

• Day traders and swing traders evaluating setups pre-entry who need to confirm that a potential trade has an R:R ratio consistent with their system's historical win rate before committing capital.
• Traders backtesting strategies who want to calculate the breakeven win rate for a given R:R target and compare it against their actual backtested results to determine if the edge is real.
• Prop firm traders managing evaluation accounts who need to verify that every trade they take meets a minimum R:R threshold — since one oversized loss on a tight drawdown limit can end an evaluation that took weeks to build.

Key Benefits

• Instant expectancy math: Calculates not just the R:R ratio but the breakeven win rate under those inputs — the hurdle your strategy needs to clear to be profitable over a large sample.
• Free, no account required: Evaluate unlimited trade setups at no cost without signing up for anything.
• Privacy. Tool inputs stay in the browser.
• Works for any asset: Stocks, futures, crypto, forex — the math is identical across all instruments since it operates purely on price distances.

Professional traders target a minimum 2:1 reward-to-risk on every setup before entering. Many trading educators note that a consistent 2:1 R:R can stay profitable in models with win rates below 40% — when fills and sizing match the plan. Ratio discipline helps; it does not guarantee long-run growth.

Use this tool alongside the Position Size Calculator to translate a confirmed R:R setup into a share or contract quantity from your risk inputs, and the Profit Target Calculator to derive a planned limit order price from your entry and stop distance.

The mathematical basis for risk/reward ratio and its interaction with win rate is covered in detail by Investopedia — Risk/Reward Ratio.

Common Use Cases

Evaluating a setup before entry: A trader identifies a stock breaking a resistance level at $50. They plan a stop at $48 (2 points of risk) and a target at $56 (6 points of reward). The calculator confirms a 1:3 R:R ratio — requiring only a 25% win rate to be profitable. The trader knows their system historically wins 40% on breakout setups, so positive expectancy is confirmed before the order is placed.

Diagnosing why a strategy is losing money: A trader has a 65% win rate but is losing money. They run their last 20 trades through the calculator and find the average R:R was 1:0.7 — meaning losses were larger than wins. At 1:0.7 R:R, a 65% win rate produces a negative expectancy. Widening targets or tightening stops to reach 1:1.5 R:R would turn the same 65% win rate into a profitable system.

Setting realistic targets on a prop firm evaluation: A trader on a Topstep evaluation needs to maintain a consistent R:R to protect their trailing drawdown. They use this calculator alongside the Prop Firm Evaluation Calculator to ensure every trade's reward target is at least 2× the stop distance — building profit buffer above the drawdown floor with each winning trade rather than grinding it away.

Frequently Asked Questions