Position Sizing: Why I Take the Same Size Every Trade

The fastest way to blow up an account is not a bad strategy. It is variable size.

Every trader who has ever sized up on a "can't miss" trade knows how this ends. The can't-miss trade misses, the loss is three times normal, and now you need a win streak just to get back to even. I don't play that game. I take the same size every single trade.

Same size. Every trade. No exceptions.

The survival math

Here is why this matters more than any setup. Trading is a game of streaks. You will have losing streaks, guaranteed, even with a great edge. The only question is whether your sizing lets you survive them.

If you risk the same fixed amount every trade, a five-trade losing streak costs you five units. You are down, but you are alive, and your next five winners recover it cleanly.

If you size up on conviction, one "high conviction" loss in the middle of that streak can cost you what three normal trades would. Now you need twice the winners to recover. The math compounds against you fast.

Same size keeps every loss equal. Equal losses are survivable. Unequal losses are how accounts die.

What "same size" actually means

Same size does not mean the same number of contracts on every trade. It means the same dollar risk on every trade.

My stop goes where the thesis dies, past the manipulation. The distance from entry to stop is different on every setup. So I size the position so that the distance times the size equals my fixed risk. Wide stop, smaller position. Tight stop, bigger position. Same dollars at risk either way.

This is the part people skip. They pick a contract count that "feels right" and then place the stop wherever. That is backwards. Structure first, stop placement second, size calculated last.

The confidence trap

"But this setup is so clean, I have to size up." No, you don't. That feeling is the confidence trap, and it has destroyed more traders than any bad strategy ever could.

Here is the truth: your feeling of confidence has almost no correlation with the actual outcome. Some of my best trades felt shaky at entry. Some of my worst felt like locks. If confidence predicted results, trading would be easy.

The moment you size up on a feeling, you have stopped trading your plan and started gambling with extra steps. The plan says same size. The feeling says more. I follow the plan.

The mistakes traders make with size

Sizing up after a winning streak. You feel hot, so you press. This is the market's favorite setup: it lets you build a cushion with small size, then takes it all back in one oversized trade. Streaks end. Size doesn't change.

Sizing up to "make back" a loss. This is revenge trading wearing a math costume. The loss already happened. Making the next trade bigger doesn't erase it, it just makes the next loss bigger too.

Risking different amounts on $SPY versus $QQQ. Different tickers, different premium, same rule. My dollar risk is fixed. The contract count adjusts. The risk never does.

Changing size based on account balance day to day. Pick your fixed risk for the account size you have and hold it. Adjust it monthly or quarterly if the account grows, not after every trade.

How this fits the PSS Model

Every PSS setup gets the same treatment. Liquidity Sweep, Directional Shift, entry in the High-Value Zone, stop beyond the manipulation. Then I calculate size from the stop distance so my dollar risk is identical.

The A+ setups don't get bigger size. The B setups don't get taken at all. Every trade that qualifies gets the same size, the same risk, the same full exit on the stop. That uniformity is what lets me review my results honestly. When every trade risks the same amount, my win rate and my average winner tell me the truth about my edge.

I trade $SPY and $QQQ 0DTEs every morning, same size, every single time. The free Discord is where it happens, join free.

And if you want the whole thing, every setup, every alert, plus my full course: the 7-day free trial gets you inside Premium free for a week.

Same size. Every trade. No exceptions.

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Free download: Want the full model my entries come from? Grab the Downside PSS Model guide free here.

FAQ

How do I calculate position size for a 0DTE options trade?

Find your entry, place your stop where the thesis dies (beyond the manipulation), then size the position so the entry-to-stop distance equals your fixed dollar risk. Wide stop means fewer contracts, tight stop means more. The dollar risk stays the same every trade.

Should I ever size up on a high conviction trade?

No. Confidence does not predict outcomes, and sizing up on a feeling turns one normal loss into an account-damaging event. Same size every trade keeps every loss equal and survivable.

What is a safe fixed risk per trade?

It depends on your account size and your personal risk tolerance, but the principle is fixed: one number, every trade, reviewed monthly or quarterly as the account changes. The key is that it stays constant across trades, streaks, and moods.

Does same size apply to both $SPY and $QQQ?

Yes. Different tickers and different premium, same dollar risk. The contract count adjusts to the stop distance and the premium, but the risk per trade never changes.

Risk note: everything on this blog is educational content from my own trading experience, not financial advice. Trading options involves substantial risk of loss.