How to Set a Stop-Loss: The Order That Keeps Your Account Alive
Jan DreherJune 20267 min readThe stop-loss is the only point in trading where you decide your maximum loss yourself. Entry, exit, market direction: all of it is hope. The stop is the one decision with a guarantee attached, and yet it is the order beginners most often leave out, move or place wrong.
What a stop-loss order is
A stop-loss order closes your position automatically when the price reaches a set level. On a long position the stop sits below the entry, on a short position above it. The exchange watches the level for you, around the clock, even while you sleep. That is exactly why a real order beats any intention to exit manually when it counts.
Stop-market or stop-limit?
For futures beginners, the stop-market order is the right choice. It sells immediately at the best available price when the level is reached, even with some slippage, but it executes. A stop-limit order only sells up to your limit price: if the market rushes through your level fast, it stays unfilled and your position open, at the worst possible moment. A few cents of slippage are the fair price for the certainty of actually being out.
Where the stop belongs
The stop belongs at the point where your trade idea is invalidated. If you buy at a support because you expect it to hold, then the idea is invalidated when the price closes clearly below it, so the stop belongs below the support. Not 2 percent below the entry because that feels round, and not at the round number where a thousand other stops sit.
Only once the stop is set is the position size calculated: risk divided by stop distance. The stop determines the size, never the other way around. Whoever fixes the position first and then looks for a stop that fits their desired risk places it right in the middle of the market noise.
The 3 classic stop mistakes
- The mental stop: 'I'll just get out then.' Under pressure you will not, and that is not a matter of character but of loss aversion. Only a real order counts.
- The dragged stop: the price approaches, you push the stop further away, 'just this once'. With that, your risk plan is worthless, because it only holds as long as it is not needed.
- The stop in the noise: 0.5 percent below the entry in a market that swings 3 percent a day. The stop gets triggered by the normal ups and downs, not by an invalidated idea.
A stop-loss you would move is not one. It is a decoration order with an expiry date.
Stop-loss and leverage: the order matters
In futures trading, the liquidation must always sit clearly beyond your stop, otherwise the exchange throws you out before your plan takes effect. Rule of thumb: with a 4 percent stop, at most 15x to 20x leverage, and with a buffer, less. Our position size calculator warns about exactly this constellation.
Frequently asked questions
Is my stop-loss guaranteed to execute at the price I set?
No. A stop-market order executes at the next available price when the level is reached, and in fast markets that can be worse than your level, which is slippage. In liquid markets like BTC or ETH it is usually small. The rare worse fill is far cheaper than a stop-limit order that does not execute at all in a crash.
Do exchanges see my stops and hunt them?
Your single stop order interests no one, but clusters of stops at obvious levels (round numbers, prominent highs and lows) attract moves, because that is where liquidity sits. The practical answer is not to skip stops, but to place them with some distance from the most obvious levels and to size positions by the 1% rule.
What is a trailing stop and do I need one?
A trailing stop automatically follows the price at a fixed distance and thereby locks in profits without you intervening. It is useful when a trade is already in profit. For getting started it is secondary: first the placing of the initial stop has to be solid, because that is what decides your risk.
What ratio should stop-loss and take-profit have?
The ratio is called the risk-reward ratio, and below 1 to 1.5 a trade is rarely worth it. At 1 to 2 (stop 4 percent, take-profit 8 percent) you can be wrong more often than right and still come out ahead on paper. What matters is setting both before the entry, so afterwards it is not your head deciding but your plan.
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Start for freeJan Dreher is the founder of learn-daytrading.com and builds tools for crypto traders, including the simulator with real live prices from Binance and Bybit and the platform's position size calculator. Here he writes about the craft behind trading: risk, position size and the math most traders fail at. Every number in his articles is verifiable, every recommendation is justified.