Updated: 2026-02-20
Free Expectancy Calculator for Traders
Quantify system expectancy from win rate, average win, and average loss. The calculator is free and intentionally simple so you can plan trades quickly without skipping risk logic.
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Expectancy Calculator
Quantify system expectancy from win rate, average win, and average loss.
Note
Outputs are only as accurate as your inputs.
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0.26 R
- >Win contribution: 0.81R
- >Loss contribution: 0.55R
How to Use the Expectancy Calculator
Enter your inputs before you place the trade, not after. Pre-trade planning is where calculators create value.
Use realistic values based on your actual execution conditions. If you understate slippage, fees, or stop distance, output quality collapses.
Document the result inside your journal so you can compare planned vs realized outcomes during review.
Formula (Expectancy)
Expectancy estimates average outcome per trade. If it's negative, your system leaks edge even if your win rate feels high.
Use R-based values (avg win/loss in R) so your expectancy stays comparable across markets and timeframes.
- •E = p(win) × avg win − (1 − p(win)) × avg loss
Why This Metric Matters
Most preventable losses come from skipping one simple calculation when markets move fast. This tool enforces the minimum math needed for disciplined execution.
The value compounds when used consistently. One correct risk decision rarely changes a year; repeated correct decisions usually do.
Tie calculator output to your strategy tags so you can evaluate whether your planning assumptions match live performance.
Add It to Your Weekly Workflow
Use this tool at planning time, then compare outcome quality in weekly review sessions.
If planned and realized values diverge, investigate execution behavior before adjusting strategy logic.
Pair this with one behavior correction each week for compounding improvement.
Common Mistakes
Using unrealistic inputs because they feel better emotionally.
Changing parameters mid-trade to justify staying in a bad position.
Treating one output as a signal to trade rather than a risk filter.
Related Resources
FAQ
?Is this Expectancy Calculator free to use?
Yes. The calculator is free and available without signup.
?What does expectancy tell me in trading?
Expectancy estimates your average outcome per trade based on win rate and average win/loss. It helps you see whether your system is structurally profitable, not just whether you had a good week.
?Can I still have winning streaks with negative expectancy?
Yes. Variance can produce streaks in either direction. The fix is to improve the components: increase win rate, increase average win, decrease average loss, or reduce costs that quietly turn a small edge into a leak.
?How accurate are calculator outputs?
Outputs are only as accurate as inputs. Use realistic assumptions and review planned vs realized values weekly.
?Can Tiltless save these values to my journal?
Yes. You can pair tool outputs with your review workflow and setup tags for better post-trade diagnostics.
Track expectancy-calculator with Tiltless
See plans and run one weekly review loop with Tiltless: edges, leaks, and enforceable next actions.