Win 70% of Your Trades, Size at 15%, and Still Go Broke

A trader wins seven out of every ten trades. Seven. And still grinds the account down to zero. Not bad luck — math. Bet fifteen percent of your account every time, and a 70% win rate can't save you.

Let me show you exactly where the leak is. Once you see it, you can't unsee it.

The belief that quietly kills accounts

You think your edge is your win rate. Get the direction right often enough, and the money takes care of itself. So you pour everything into being right — better entries, cleaner setups, a higher hit rate.

You're not wrong that win rate matters. It just isn't the thing that decides whether you survive. What decides survival is how much of your account rides on each trade. Get that number wrong and it doesn't matter how good your reads are. The account still bleeds out.

Start with the simplest case: $100 and a lucky coin

Take $100. Imagine a coin that lands in your favor 70% of the time. That's a fantastic edge — better than almost anything you'll ever trade.

Now bet 15% of whatever you have, every single flip. Win, you gain 15% of your stack. Lose, you drop 15%. Sounds safe — you win most of the time, right?

Watch what happens when wins and losses arrive the way the market actually delivers them: clustered, not politely alternating.

Crack one: a 15% loss and a 15% gain don't cancel

Lose 15% and you're at $85. Gain 15% back and you're only at $97.75. You won a flip and you're still down.

That gap is the compounding tax, and it widens with every swing. The bigger your bet, the wider the gap. At 2% bets it's a rounding error. At 15% it's a trapdoor. And you haven't even hit a losing streak yet.

Crack two: the streak nobody budgets for

A 70% win rate means a 30% loss rate. Flip a coin like that a hundred times and you will see runs of four, five, six losses back to back. Not maybe — reliably. Over a year of trading, a five-loss streak isn't the disaster scenario. It's Tuesday.

Run that streak at 15%. Start at $100. Six losses in a row:

• $85
• $72
• $61
• $52
• $44
• $38

You've lost 62% of your account on a run statistics say you'll hit several times a year.

Now the cruel part. To get back to even from $38, you don't need a 62% gain. You need to nearly triple your money — a 163% gain. Your winning trades pay 15% each. Do the math on how many perfect wins that takes, and how likely you are to string them together before the next streak lands.

The curve nobody shows you

Picture a chart. On the horizontal axis: your bet size as a percent of account. On the vertical axis: your probability of eventually going broke. Hold the edge fixed at a real 70%.

• At 2% per trade, risk of ruin is essentially zero. You compound for years.
• At 5%, still safe.
• Somewhere around 10–12%, the curve turns vertical.
• By 15%, with the same 70% edge, your probability of ruin climbs past the point of no return.

Same win rate. Same edge. The only thing that changed is the size of the bet — and it moved you from certain growth to certain death. That's the whole game in one picture.

The one sentence to carry to the screen

Your edge tells you if you win. Your bet size tells you if you survive to collect it.

You can be the best forecaster in the room and still go to zero, because ruin doesn't ask how right you were. It asks how much you had left when the streak finally came.

What disciplined traders actually do

They size off the worst case, not the average case.

The common rule: risk no more than 1–2% of your account on any single trade. That means the distance from your entry to your stop, times your position, is 1–2% — not the whole position. On a $10,000 account, that's $100 to $200 of real risk per trade.

It feels painfully small. That feeling is exactly why most people over-size and blow up. Small bets aren't timid. They're what let your edge compound long enough to actually pay you.

This isn't just an options thing

It's every leveraged bet you'll ever make. A 0DTE position that's a quarter of your account. A single stock you're convinced can't miss. A crypto trade sized on conviction instead of math.

The question is never just am I right. It's: if I'm wrong five times in a row — which I will be — am I still in the game? Run that check before every entry and you've already beaten most of the people trading against you.

Change this tonight

Pull up your last twenty trades and calculate what percent of your account each one actually risked. If any are north of 5%, you're not trading an edge — you're feeding a coin flip. Fix the size before you touch the strategy.

This is educational commentary, not personalized financial advice. Do your own work before you risk real money.

Want the full walkthrough, including the risk-of-ruin curve drawn out step by step? Watch the video: https://youtu.be/v3syqtp6ato