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Probability & streaks · free, no login

Win/Loss Streak Simulator

Pure randomness produces uglier streaks than you think.

Median longest losing streak6 trades
95th-percentile losing streak9 trades
Worst losing streak observed16 trades
Median longest winning streak6 trades

Every streak shown comes from pure randomness at a fixed win rate — no edge, no market. If coin flips produce 8-loss streaks, so will your strategy.

Educational tool only — not financial advice. Verify figures with your broker.

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What is the Win/Loss Streak Simulator?

The Win/Loss Streak Simulator is a seeded Monte-Carlo tool that runs thousands of pure coin-flip 'trading' sequences at your chosen win rate to show what losing and winning streaks random chance alone produces. It answers 'how ugly can streaks get with no edge and no market involved?' — a reality check on what randomness looks like.

How to use it

  1. Set your Win rate (%) — the fixed probability each simulated trade wins.
  2. Enter Trades per run, the length of each simulated sequence, e.g. 100.
  3. Enter Simulated runs, how many sequences to generate, e.g. 2000.
  4. Read the outputs: Median longest losing streak (the typical run), 95th-percentile losing streak, Worst losing streak observed across all runs, and Median longest winning streak.
  5. Compare the worst losing streak to what you would emotionally tolerate — pure randomness alone often produces longer runs than traders expect.

How it's calculated

For each of the simulated runs, the tool draws a sequence of independent win/loss outcomes using a seeded random generator, with each trade winning at the fixed win rate. It records the longest losing and winning run in every sequence, then reports the median, the 95th percentile, and the maximum of those longest-streak values across all runs.

Frequently asked

What does a trading streak simulator show me?

This Monte Carlo trading streak simulator shows the distribution of losing and winning streaks produced by pure randomness at a fixed win rate — a baseline for what variance alone can do to any strategy.

Why do the results change... or don't they?

The simulation is seeded, so the same inputs reproduce the same streaks each time. That makes the numbers repeatable rather than a new roll on every click.

If coin flips give 8-loss streaks, what does that mean for me?

It means an 8-loss streak is not evidence your strategy is broken — randomness alone produces runs that severe, so your real strategy will too.

Keep in mind: Every streak shown comes from pure randomness at a fixed win rate — there is no edge, no market, and no strategy in the model. The numbers describe what chance can do, not what your system will do or whether it is any good.

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