What Is a Stop-Loss Order in Forex and How to Use It

No trader is right all the time. A stop-loss order decides in advance how much you are willing to lose on a trade and closes the position automatically if that point is reached. It is one of the most basic, and most important, risk tools available.

What a stop-loss is

A stop-loss is an instruction to your broker to close an open trade when the price reaches a specified level that is worse than your entry.

• On a buy (long) trade, the stop-loss is placed below the entry price. It is triggered by the bid.
• On a sell (short) trade, the stop-loss is placed above the entry price. It is triggered by the ask.

The bid and ask detail matters; see Bid and ask prices for why a short trade's stop can be hit before the chart touches your level.

Why stop-losses matter

A stop-loss turns an open-ended risk into a defined one, at least under normal conditions. It helps you:

• Limit the damage from any single trade, so one bad idea does not wipe out weeks of work.
• Remove in-the-moment decisions, when fear or hope can lead to holding a losing trade too long.
• Size positions properly, because you know the distance to your exit before you enter.

Stops are a core part of risk management, covered more broadly in Basic risk management.

Types of stop-loss orders

• Standard stop-loss: when triggered, it becomes a market order and closes at the next available price.
• Guaranteed stop-loss: offered by some brokers, usually for an extra fee or wider spread. It closes at exactly your level, even if the market gaps.
• Trailing stop: follows the price at a set distance as the trade moves in your favor, but does not move back. It can lock in some profit while leaving room for the trade to run.

Worked example: sizing a trade around the stop

Assume you have a $5,000 account and decide to risk no more than 1% on a trade, which is $50. EUR/USD is quoted at 1.0850 (illustrative), and you plan to buy with a stop-loss at 1.0825.

1. Stop distance = 1.0850 − 1.0825 = 0.0025 = 25 pips.
2. Pip value for 1 standard lot of EUR/USD = $10.
3. Position size = risk ÷ (stop pips × pip value per lot) = $50 ÷ (25 × $10) = 0.20 lots.
4. Check: 0.20 lots has a pip value of $2. 25 pips × $2 = $50.

If the stop is hit, the loss is about $50 plus the spread and any slippage. The Position Size Calculator performs these steps for any pair.

Where to place a stop-loss

There is no single correct distance, but good stops are based on the market, not on how much you want to win. Common approaches include:

• Beyond a technical level. For a long trade, below a recent swing low or a support zone, so that a move there suggests your idea was wrong. See Support and resistance.
• Based on volatility. Using a multiple of the pair's typical daily or hourly range, so normal noise does not trigger the stop.
• Allowing for the spread. Add a small buffer, especially on short trades and around news.

Then adjust the position size, not the stop, to keep the money at risk within your limit.

The limits of a stop-loss

A standard stop-loss is not a guarantee. If the market gaps over your level, for example after a weekend or a surprise announcement, the order fills at the first available price, which can be much worse. This difference is called slippage. Losses can therefore exceed the amount you planned. Guaranteed stops address this, at a cost.

Common mistakes

• Trading without a stop. One unprotected trade can cause a large loss.
• Placing stops too tight. Normal price fluctuations and the spread can close good trades early.
• Moving the stop further away after the trade goes against you. That increases risk beyond your plan.
• Choosing a stop based on a round number of dollars rather than a meaningful price level.
• Assuming the stop guarantees the exit price. Gaps and slippage happen.

Summary

A stop-loss is a pre-set order that closes a losing trade at a chosen level, below the entry for longs and above it for shorts. By deciding the stop first and sizing the position around it, you can limit each loss to a planned share of your account. Stops work well in normal conditions but cannot prevent slippage in gaps or fast markets, so they reduce risk rather than remove it. Pair them with a sensible target, covered in What is a take-profit?.