Trading Expectancy Calculator
Win rate on its own tells you almost nothing — you can win 70% of trades and still lose money. Expectancy is the number that settles it: what one average trade is worth to you in rupees. Enter your win rate and average win and loss to find out.
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Also searched as: profit factor calculator, trading edge calculator, average win loss calculator, trading system expectancy, expected value per trade
At this win rate and payoff, you need 33.3% to break even and you are running at 45.0%. The margin is what pays you — protect it by not changing the rules mid-drawdown.
What is trading expectancy?
Expectancy is the average rupee result of one trade, taken across a large number of trades. It is the single number that tells you whether a trading system makes money, because it combines how often you win with how much you make when you do.
Win rate alone is famously misleading. A system that wins 70% of the time can lose money steadily, and one that wins 35% of the time can be highly profitable. Expectancy settles the question that win rate cannot.
How to use this expectancy calculator
- Enter your win rate — winning trades divided by total trades, as a percentage. Take this from your actual trade history, not from memory.
- Enter your average win in rupees, across winning trades only.
- Enter your average loss in rupees, across losing trades only, as a positive number.
- Set how many trades to project to see what the edge is worth over a realistic sample.
You need at least 30 closed trades for the output to mean anything, and closer to 100 before you should act on it.
Two traders, same market
| Trader A | Trader B | |
|---|---|---|
| Win rate | 45% | 70% |
| Average win | ₹3,000 | ₹1,000 |
| Average loss | ₹1,500 | ₹3,000 |
| Expectancy per trade | +₹525 | −₹200 |
| After 100 trades | +₹52,500 | −₹20,000 |
Trader B wins far more often and still goes broke, because the losses are three times the size of the wins. This is the most common profile among traders who cut winners early and let losers run — which feels good on every individual trade and is ruinous in aggregate.
How expectancy is calculated
Expectancy = (Win rate × Average win) − (Loss rate × Average loss)Expectancy answers one question: what is a single trade worth to you, on average, if you take this setup over and over? It is the only number that combines how often you win with how much you make when you do.
A trader winning 45% of the time with a ₹3,000 average win and a ₹1,500 average loss has an expectancy of (0.45 × 3,000) − (0.55 × 1,500) = ₹525 per trade. A trader winning 70% with a ₹1,000 average win and a ₹3,000 average loss has (0.70 × 1,000) − (0.30 × 3,000) = −₹200. The second trader wins far more often and still goes broke.
Profit factor
Gross profit divided by gross loss. Above 1.0 is profitable, 1.5+ is generally considered solid, and 2.0+ is strong. Treat very high values from small samples with suspicion — they usually come from one outsized winner rather than a repeatable edge.
How many trades before you trust it
At least 30 before the number is worth looking at, and closer to 100 before you trust it. Below that, one or two lucky trades dominate the average and you end up drawing confident conclusions from noise. This is the practical reason to journal every trade, not only the ones you remember.
The two ways to improve it
There are only two levers: win more often, or make more when you win relative to what you lose. Most traders instinctively chase the first, which is the harder one. Letting winners run and cutting losers faster moves the second, and is usually where the improvement actually comes from.
Frequently asked questions
Expectancy = (win rate × average win) − (loss rate × average loss). It is the average rupee result of a single trade taken over and over. A positive expectancy means the system makes money over a large enough sample; a negative one means no amount of discipline will save it.
A calculator tells you the plan. A journal tells you if you followed it.
TradeXJournal records every trade you take, tags the setup and the mistake, and shows you which of your setups actually make money. Free for 14 days, no card needed.
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