What is trading expectancy?

Trading expectancy is the average amount you can expect to make or lose per trade over a large sample, calculated as: (Win Rate × Average Win) minus (Loss Rate × Average Loss). A positive expectancy means the strategy makes money consistently when executed correctly.

Can I profit with a win rate below 50%?

Absolutely. A 37.5% win rate with a 2.83x Reward:Risk ratio produces positive expectancy. Many professional trend-following strategies win only 30-40% of the time. Win rate alone means nothing — the ratio of average win to average loss determines profitability.

What is the breakeven win rate in trading?

The breakeven win rate is the minimum win rate needed to break even at your current Reward:Risk ratio. It is calculated as 1 divided by (1 + R:R). For a 2:1 R:R, the breakeven win rate is 33.3%. If your actual win rate exceeds this, you have a positive edge.

How many trades do I need for reliable expectancy data?

A minimum of 100 trades gives a rough signal. 200+ trades gives statistically meaningful results. Below 100 trades, a lucky or unlucky streak can distort your expectancy significantly.

Free Tool

Trading Expectancy Calculator

Discover whether your trading strategy has a real mathematical edge — or is slowly draining your account. Adjust your win rate, average win, and average loss to see your exact expectancy per trade, breakeven win rate, R-multiple, and realistic losing streak probabilities. Free, instant, no sign-up.

Expectancy FormulaBreakeven Win RateR-MultipleStreak SimulatorMonthly P&L

Strategy Parameters

Win Rate40%

The % of trades that close in profit

Average Win₹5,000

Average profit per winning trade (after costs)

Average Loss₹2,000

Average loss per losing trade (after costs)

Account & Sample Size

Number of Trades200 trades

Minimum 200 recommended for statistically reliable results

Account Size₹2.00L

Risk Per Trade1%

= ₹2,000 per trade at current account size

Positive Edge₹800 / trade

This strategy earns money on average. Consistent execution across the full sample should produce profit over time.

Reward:Risk

2.50×

Good

Breakeven Win%

28.6%

You beat it ✓

Over 200 trades

₹1.60L

total expected P&L

R-Multiple

+0.40R

edge per trade

Formula Breakdown

Expectancy=(40% × ₹5,000)−(60% × ₹2,000)

Expectancy=₹2,000−₹1,200=₹800

Breakeven win rate for R:R 2.50× is 28.6%

Your win rate of 40% clears the 28.6% threshold by 11.4 percentage points. You have a real edge.

The counter-intuitive truth: A 37.5% win rate with 2.83× R:R earns ₹1,311/trade in expectancy, while a 60% win rate with 0.5× R:R loses ₹200/trade. Win rate alone is meaningless. Expectancy is everything.

What is this calculator & how does it help?

🎯

Find your true edge before risking money

Most traders guess whether their strategy is profitable. This calculator forces the math — plug in your actual win rate and trade sizes to see whether your system earns or bleeds money per trade.

📐

Breakeven win rate — know your floor

For any Reward:Risk ratio, there is a minimum win rate you must achieve to break even. If your actual win rate is below this, no discipline or trade management can save you — the math is the problem.

📉

Prepare for losing streaks before they happen

The Streak Simulator shows the probability of 3, 5, 7, and 10 consecutive losses in your sample. Knowing these odds in advance prevents panic exits during normal, statistically expected drawdown periods.

📅

Project monthly P&L with realistic variance

The Monthly P&L tab shows what a year of trading might look like with natural variance — not just the average. Good months, bad months, and everything in between, based on your strategy parameters.

Expectancy Formula

(Win Rate × Avg Win)−(Loss Rate × Avg Loss)=Expectancy / Trade

Frequently Asked Questions

Related Tool

Drawdown Visualizer

See the worst-case equity decline your strategy can produce. Includes 3 simulated equity paths, recovery % table, and consecutive loss impact in rupees.

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Deep Dive Article

What is Backtesting in Trading? Free Tools + Real Data & Hidden Truths

Learn why a 37.5% win rate strategy can be more profitable than a 60% win rate strategy, and how to backtest any strategy for free in Indian markets.

Read Article →

Disclaimer: This calculator uses your inputs to compute mathematical expectancy. Results are estimates based on the numbers you provide and assume consistent execution across all trades. Past expectancy (from backtesting) does not guarantee future performance. This tool is for educational purposes only and does not constitute trading advice.