Risk Management: Position Size, Stops and the 1% Rule

Most beginners spend their time on entries: which pattern, which indicator, which moment. Entries matter less than you think. Two people can take the exact same trade and end the year in very different places, because one of them bet a sensible amount and the other did not. Risk management is the part of trading you fully control, and it comes down to three numbers you should know before you click anything: where you are wrong, how much you accept to lose there, and how many shares that allows.

The formula, in one line

Position size = account risk ÷ per-share risk. Account risk is the dollar amount you are willing to lose if the trade fails, often 0.5% to 1% of the account. Per-share risk is the distance between your entry and your stop. That is it. The formula forces an order of operations: you cannot know the size until you know the stop, and you cannot know the stop until you have decided what would prove the idea wrong.

You can run these numbers in the position size calculator, but it is worth doing one by hand first so the logic sticks.

A full example: JPM, August 2024

JPMorgan fell with the rest of the market in early August 2024, bottoming at 190.90 on August 5. It then climbed back, and on August 14 closed at 210.24, above the congestion of the previous week. Suppose that close is the entry and the account is $10,000.

Step 1: find where the idea is wrong

The most recent pullback low before the entry was 203.66, on August 12. If price trades back below that, the recovery has failed its first test, so the stop goes there. As a cross-check, JPM's 14-day Average True Range on August 14 was 4.65. A stop 1.5 ATR below entry would sit at 203.26, within half a point of the swing low. When a structural stop and a volatility stop land in the same place, that is a good sign the stop is neither too tight nor arbitrary.

Step 2: size the position

Notice the position is almost a third of the account, yet the risk is only 1%. Beginners often confuse the two. "I only put 10% in" says nothing about risk if there is no stop, and "I put 32% in" is fine if the stop is 3% away.

Step 3: set a target and compare

A target at twice the risk (2R) is 210.24 + 2 × 6.58 = 223.40. JPM traded 225.48 on August 30, so the target filled for a gain of 15 × 13.16 = $197.40. The same chart also shows why the exit plan matters: anyone who ignored the target and held on watched the stock slide to 200.61 on September 10, through the original stop. The trade worked, and it would still have become a loss without a plan for both exits.

Why 1% and not 5%

Losing streaks are normal. Ten losses in a row sounds extreme, but for a strategy that wins half the time it will happen eventually over a long enough run of trades. Here is what ten straight losses do at different risk levels:

The asymmetry comes from simple arithmetic. After a loss of d, you need 1 ÷ (1 − d) − 1 to recover. A 10% drawdown needs 11.1%, 20% needs 25.0%, 30% needs 42.9%, 50% needs 100%, and 75% needs 300%. Small losses are an inconvenience. Large ones change what you can realistically get back.

Stops that make sense

• Put the stop where the chart says you are wrong: below a swing low for a long, above a swing high for a short, or beyond a support or resistance zone rather than right on it.
• Check the stop against ATR. If it is less than about one ATR from entry, ordinary daily noise can hit it. If it is five ATRs away, the position will be tiny, and that is the correct result, not a reason to move the stop.
• Never widen a stop after entry to avoid being taken out. Tightening it as the trade moves in your favour is fine; loosening it turns a planned loss into an unplanned one.
• Know how your stop executes. A stop order becomes a market order when triggered, so on a gap it can fill well beyond your level.

Crypto: same formula, smaller size

Volatility decides how much you can hold. On August 14, 2024, JPM's ATR was 2.21% of its price. Bitcoin's daily ATR the same day was 3,264 dollars on a close of 58,683, or 5.56%. With the same $100 risk and a 1.5 ATR stop, the JPM position would be worth about $3,011 while the Bitcoin position would be worth about $1,198. Crypto also trades around the clock, so there is no closing bell to stop a bad night. The formula does not change; it simply hands you a smaller number, and you should accept it.

A pre-trade checklist

Most costly mistakes are skipped steps rather than bad analysis. Before each trade, write these down:

1. The reason for the trade in one sentence.
2. Entry price, stop price, and the reason the stop is there.
3. Risk in dollars and the resulting number of shares.
4. Target or exit rule, and the reward-to-risk ratio it implies.
5. What you will do if the price gaps through the stop.
6. A daily loss limit. If you hit it, you stop for the day.

A reward-to-risk of 2:1 means you only need to be right about a third of the time to break even before costs. That is why the checklist asks for the ratio before the trade, not after: once you are in, every target starts to look too far away and every stop too close.