The 1% rule: position sizing with a real example

The rule caps the money you can lose on one trade at one percent of your account. On a $50,000 account that is $500 of risk, not a $500 position.

Risk is the distance from your entry to your stop multiplied by your position size. The rule limits the loss, not the size, so two traders can take the same setup and hold very different positions.

That is the part most traders miss. The stop sets your risk per share. Your account sets how many shares you can afford to hold to that stop.

Say you buy a stock at $50.00 with a stop at $48.00. The distance is $2.00 per share, so that is your risk per share.

One percent of $50,000 is $500. Divide $500 by the $2.00 stop and you get 250 shares. The position is worth $12,500, but the money actually at risk is $500.

Nothing about the trade changed. You still have the same entry, the same stop, and the same target. Only the size answers to your account instead of your mood.

Now risk 5% instead. The allowed loss is $2,500, so the same $2.00 stop lets you buy 1,250 shares. The position is five times larger and so is the damage when the stop is hit.

Run eight losses in a row on both accounts. At 1% per trade the account falls from $50,000 to about $46,100, a drawdown near 8%. You need roughly 8% to get back to even.

At 5% per trade the same eight losses take the account to about $33,200, a drawdown near 34%. Getting back to even now takes a gain of about 51%. The losing streak was identical. The sizing decided the outcome.

Decide your stop before your size. Pick the level where the trade is wrong, measure the distance to entry, then let the rule set the shares. Traders who do it backwards size first and invent a stop to fit.

Work in risk, not in position value. A 1% loss is $500 whether you hold 250 shares of a $50 stock or 5 contracts of an index future.

On a prop account the rule matches the daily loss limit. Risking 1% per trade means even four or five losses in a single day usually keep you inside a typical 5% daily rule.

Oversizing feels like conviction. It is exciting right up until one bad week removes the account you needed for the next setup.

The traders who break the rule are rarely reckless. They risk 3% or 4% to make back a loss, and the journal never shows it because nobody writes down the number they should have used.

You cannot fix what you never measure. Position size has to be a recorded number, not a feeling you recall later.

Add a risk column to every trade and record both planned and actual risk. The gap between them is where the real story lives.

Once a month, sort the journal by risk and look at the outliers. The trades where you quietly risked 4% to get even are the ones to fix first.

The goal is not a perfect record. It is catching the handful of trades that break the rule before they turn into the trade that ends your streak.