A stop-loss is a risk-management order that automatically closes your position once price hits a preset level. Learn how a stop-loss order works, how it differs from a stop-limit and a trailing stop, and how to place one that actually protects you.
A stop-loss is an order that automatically closes your position once price hits a level you choose in advance. It is the single most important risk-management tool in trading: it caps how much a trade can cost you, so one bad move cannot quietly turn into a blown account while you look away.
The idea is simple. Before (or right after) you enter a trade, you decide the price at which you would admit the trade is wrong. You attach a stop-loss there. From that moment, you no longer have to watch the market to be protected — if price reaches your level, the position closes on its own.
Every stop-loss has two parts: a trigger price that decides when it activates, and an execution method that decides how it closes the position.
For a long position you place the stop below your entry: if price falls to it, you sell and exit. For a short you place it above your entry: if price rises to it, you buy back and exit. This is closely related to how conditional orders behave in general — see Order Types Explained for the full family of market, limit, and stop orders.
"Stop-loss" is often used loosely, but there are three distinct tools. Each trades off certainty of exit against control of price:
| Type | What It Does | Trade-Off |
|---|---|---|
| Stop-Loss (Stop-Market) | Trigger fires a market order to exit immediately. | Prioritizes getting out; fill price not guaranteed (slippage). |
| Stop-Limit | Trigger fires a limit order at a price you set. | Controls fill price, but may not fill if price gaps past the limit. |
| Trailing Stop | Stop level follows price at a fixed distance as the trade moves in your favor. | Locks in gains automatically, but noise can trail you out early. |
A stop-limit is useful when you refuse to sell below a certain price — but be clear on the danger: if the market crashes straight through your limit, the order sits unfilled and you are still holding the loss. A trailing stop is handy for letting winners run: as price climbs, the stop climbs with it at a set distance, so you keep more of a move without moving the order by hand.
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A stop-loss only helps if it is placed with intent. The goal is not to pick a comfortable number — it is to define the point at which your trade idea is objectively wrong.
Ask: at what price is my reason for the trade no longer valid? For a long, that is usually just below a support level or swing low; for a short, just above resistance. That structural point — not a round number — is where your stop belongs.
Markets rarely move in straight lines. Give the stop enough room to survive normal noise so you are not knocked out by a random wick, but not so much room that the loss becomes unacceptable. Wider-moving assets need wider stops.
Decide your dollar risk first (commonly 1-2% of your account). Then set position size so the distance from entry to stop equals exactly that amount. The stop distance drives the size — never the other way around.
Place the stop when you open the trade, while you are still calm and objective. The worst time to decide where your stop goes is after the trade is already moving against you.
Stop placement and position sizing are two halves of the same skill. For the full framework, see Position Sizing & Risk Management, and to understand how stops relate to break-even math, read Win Rate & Risk-Reward.
Most stop-loss failures are not about the tool — they are about how it is used. Three mistakes cause the majority of the damage:
A stop jammed right against entry gets hit by ordinary market noise before your idea has room to work. You take a string of small losses on trades that would have been winners. Give the stop room based on volatility, then size down to keep the dollar risk fixed.
Widening a stop as price approaches it — hoping the trade recovers — is the single most account-destroying habit in trading. It converts a small, planned loss into an open-ended one. Move a stop only in your favor, never away from your exit.
Trading without a stop means your maximum loss is set by the market, not by you. One gap or liquidation cascade can undo months of gains. On leverage, no stop is how accounts get liquidated.
A stop-loss is the difference between a loss you planned and a loss that plans you. It automatically closes your position at a level you choose, capping the downside so no single trade can end your account. Set it at your invalidation level, size the position around it, and resist the urge to move it.
Be honest with yourself about its limits, too. A stop reduces risk; it does not guarantee a fill. Slippage, gaps, and thin liquidity mean the exit can land worse than the trigger — which is exactly why sizing sensibly matters as much as placing the stop at all.
Educational content only, not investment advice. Trading perpetual futures carries substantial risk of loss. Facts verified 2026-07-01.
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