A losing streak in trading is a run of consecutive losing trades, and it is far more common than it feels. At a 50% win rate, the typical longest losing streak in 100 trades is six in a row; at 40% it is seven, and one trader in ten sees eleven or more. Knowing your number before it happens is the difference between sticking to a tested plan and abandoning it at the worst possible moment.
Below are the exact odds by win rate, what a streak does to an account at different levels of risk, and how to tell ordinary bad luck from a strategy that has stopped working. Every number comes from plain probability, and the method is explained so you can check it.
The longest losing streak to expect
Treat each trade as an independent event with a fixed win rate (a simplification we come back to below). The table shows the longest losing streak to expect in a run of 100 trades and in a run of 500. “Typical” is the median: half of all traders with that win rate see a longer streak, half a shorter one. The bad-luck column is the streak that at least one trader in ten will hit.
| Win rate | Typical longest streak, 100 trades | Bad luck (1 in 10), 100 trades | Typical longest streak, 500 trades |
|---|---|---|---|
| 30% | 10 | 15 | 15 |
| 40% | 7 | 11 | 11 |
| 50% | 6 | 8 | 8 |
| 60% | 4 | 6 | 6 |
| 70% | 3 | 5 | 5 |
Two things stand out. Streaks grow with the number of trades, so an active trader meets the long ones sooner. And they grow quickly as the win rate falls: a system that wins 30% of the time hits ten losses in a row in a typical run of 100 trades, even if its winners are big enough to make it profitable overall. Low win rates are not a flaw in themselves, but they demand a tolerance for streaks that many traders discover only in the middle of one.
How likely is a streak of 5, 8 or 10 losses?
The same maths read the other way round: the chance that a run of 100 trades contains at least one streak of a given length somewhere in it.
| Win rate | 5 or more in a row | 8 or more in a row | 10 or more in a row |
|---|---|---|---|
| 30% | over 99% | 86% | 58% |
| 40% | 98% | 49% | 20% |
| 50% | 81% | 17% | 4% |
| 60% | 46% | 4% | under 1% |
| 70% | 15% | under 1% | under 1% |
Compare that with the chance that the next few trades all lose, which is simply the loss rate multiplied by itself: at a 50% win rate, the next five trades all lose 3.1% of the time, and the next ten 0.1%. That is why a streak feels so unlikely while you are in it. You are looking at the next handful of trades, but over a hundred trades a streak of that length is likely to turn up somewhere.
What a streak does to your account
The damage depends on how much you risk per trade. With a fixed percentage of the account at risk, each loss takes that percentage of what is left, so the drawdown after a streak is 1 minus (1 minus the risk) raised to the number of losses.
| Risk per trade | Drawdown after 8 losses | Drawdown after 12 losses |
|---|---|---|
| 1% | 7.7% | 11.4% |
| 2% | 14.9% | 21.5% |
| 5% | 33.7% | 46.0% |
At 1% risk, even an unusually long streak is a bad month. At 5%, the same streak takes almost half the account, and climbing back from a 46% drawdown needs a gain of about 85%. That is why position size, more than entry quality, usually decides whether a trader survives a streak. The position size calculator turns a risk percentage into a size for any stop distance, and the risk of ruin calculator shows how win rate, payoff and risk combine over many trades.
Normal bad luck, or a broken strategy?
A streak inside the range your win rate predicts is not evidence that anything is wrong. A streak well outside it deserves a closer look. Three checks help:
- Compare it with your tested win rate, not your hopes. If your backtest or journal shows a 45% win rate over a few hundred trades, a nine-trade losing streak is uncomfortable but normal: in 300 trades at that win rate, the chance of one is 46%. If the win rate came from twenty trades, you do not know your number yet; see how many trades you need to backtest.
- Check whether the trades still followed the rules. Pull the losing trades from your journal and check each against the plan. Streaks often include a few trades taken outside the setup out of frustration, and those are a discipline problem rather than a strategy problem.
- Look at the market, not just the results. If volatility or the trend changed (a range became a trend, or the reverse), a strategy built for one condition can lose for a long stretch in the other. That is exactly where the independence assumption behind the tables stops holding.
Why real streaks can run longer than the maths
The tables assume that every trade is independent, so the result of one tells you nothing about the next. Real trading bends that in two ways. Market conditions cluster, so losing trades tend to arrive together when a strategy’s favourite conditions disappear. And traders change their behaviour during a streak, taking extra trades or skipping good ones. Both make streaks longer and more frequent than the tables suggest, so treat the bad-luck column as a floor rather than a ceiling.
Costs matter here too. A strategy whose edge is thin before fees can turn into one that only produces streaks once commission and spread are counted. In our strategy study, 49 widely taught strategies went through 154 backtests and 127,817 trades with trading costs on, and none earned a verified edge.
How to know your own numbers
The tables are only as good as the win rate you bring to them. To find yours and plan for it:
- Backtest the strategy over at least a few hundred trades with costs on, then compare its longest losing streak with the table for its win rate. Bar-by-bar replay is the closest thing to living through a streak without paying for it, and the replay demo runs in your browser with no sign-up.
- Journal live trades and tag each one as inside or outside your rules, so a streak can be split into strategy losses and discipline losses. Our guide to keeping a trading journal covers what to record.
- Write a streak rule into your plan before you need it, for example: after a set number of losses in a row, halve the size and review the last trades against the rules. Deciding in advance is far easier than deciding in the middle of a streak.
Then check that the strategy is worth the streaks it brings. A 35% win rate with winners three times the size of losers earns 0.40R per trade on average, which the expectancy calculator will confirm, yet in 300 trades it produces a ten-trade losing streak about three times in four. Profitable and painful are not opposites.
Frequently asked questions
How many losing trades in a row is normal?
It depends on your win rate and on how many trades you take. In 100 trades, the typical longest losing streak is about ten at a 30% win rate, seven at 40%, six at 50% and four at 60%, and one trader in ten will see a noticeably longer one.
What is the probability of 10 losses in a row?
For the next ten trades specifically, it is the loss rate to the power of ten: about 2.8% at a 30% win rate, 0.6% at 40% and 0.1% at 50%. The chance that a ten-trade streak appears somewhere in a run of 100 trades is much higher: about 58% at a 30% win rate and 20% at 40%.
Should I stop trading after a losing streak?
Not automatically. If the streak is within the range your tested win rate predicts and the trades followed your rules, stopping turns normal variance into a decision you will regret. A rule set in advance works better: reduce size or pause to review after a set number of losses, then resume once the review finds no broken rules and no change in the market.
How do I survive a long losing streak?
Risk a small, fixed percentage of the account per trade, so a long streak costs a bad month rather than the account. At 1% risk, twelve losses in a row is an 11.4% drawdown; at 5% risk, the same streak is a 46.0% drawdown that needs an 85% gain to recover.