How Many Losing Trades in a Row Is "Normal"?

Every trader has had it happen: four, five, six losses in a row. And the first thought is always the same: "something's broken. My strategy stopped working."

But here's what most traders never check: is that losing streak actually abnormal, or is it just... statistics?

The math behind losing streaks

If you have a 50% win rate and take 100 trades, how many times would you expect to see 5 losses in a row? According to binomial probability, the answer is 95%. Almost guaranteed to happen.

Even at a 70% win rate, a genuinely strong edge, there's still a 21% chance of hitting 5 losses in a row somewhere in those 100 trades, and a 55% chance of hitting 4 in a row.

This is the table that breaks that illusion:

Why this matters more than your win rate

Most traders judge their system trade by trade. But a strategy isn't measured by any single trade, or even any single streak, it's measured by its expectancy over hundreds of trades. A 5-loss streak at 50% win rate isn't a sign of a broken system. It's the system working exactly as the math predicts.

The danger isn't the losing streak itself. It's not knowing whether the streak you're in is statistically normal, and abandoning a profitable strategy because of it, or doubling down on a broken one because "the streak has to end soon."

The only way to actually know

You can't tell the difference between "normal variance" and "my edge is gone" by feel. You need your actual win rate, tracked over enough trades to mean something, not your gut sense of how the week went.

This is exactly what a trading journal is for: not just logging trades, but giving you the real numbers behind your system so you can tell statistical noise apart from an actual problem.

If you don't know your real win rate right now, that's the first thing to fix before you change anything else about your strategy.