A stop loss is your most important risk management tool. Placed correctly, it limits your loss on any trade to a pre-defined amount. Placed incorrectly, it gets triggered too early — or worse, never set at all. Here's how to do it right.
A stop loss is a pending order that automatically closes your trade if price moves against you by a specified amount. Once set, it removes the need for you to monitor the trade constantly and eliminates the emotional decision of when to exit a losing trade.
When you enter a trade, your stop loss defines exactly how much you stand to lose if you're wrong. Without one, there's no limit to how much you can lose on a single trade.
The most common mistake is setting a stop loss based on how much money you want to lose rather than where the market tells you the trade is invalidated.
"I only want to lose $50 on this trade, so I'll put my stop 10 pips away" — this is backwards. The market doesn't care about your $50. If 10 pips isn't a logical level, your stop will get hit by normal market noise and you'll be stopped out of perfectly good trades.
Place your stop loss at a level where, if price reaches it, your trade idea is proven wrong. This is always based on market structure — not dollar amounts.
For a long trade, place your stop just below a clear support level. If price breaks below that support, the bullish case is invalidated. For a short trade, place your stop just above resistance.
Always add a small buffer beyond the level (5-10 pips) to account for wicks and spread. Don't place stops exactly at round numbers or obvious levels where many other traders place theirs.
In an uptrend, price makes higher highs and higher lows. Place your stop below the most recent swing low. If price breaks below it, the uptrend structure is broken and your long trade is invalidated. For downtrends, stop above the most recent swing high.
The Average True Range (ATR) measures how much a market typically moves in a given period. Setting stops at 1.5-2x the ATR gives the trade enough room to breathe through normal volatility without being too wide. This is a more systematic approach that works well across different pairs and timeframes.
There's no universal answer — it depends on the timeframe and volatility of the market. Generally:
The wider the stop, the smaller the position size needs to be to keep risk at 1-2% of your account.
Your stop loss distance and position size are directly linked. A wider stop doesn't mean more risk — as long as you reduce your position size accordingly. The formula keeps your dollar risk the same regardless of stop distance.
Use our Position Size Calculator to automatically calculate the right lot size for any stop loss distance while keeping your risk at 1-2%.
Never move it further away — this turns a planned small loss into a potentially catastrophic one.
Moving it to breakeven (your entry price) once the trade is profitable is acceptable and reduces risk to zero.
Trailing your stop — moving it up as price moves in your favor — is a valid strategy to lock in profits while letting winners run.
Some traders say they use "mental stop losses" — they'll close the trade manually if price hits a certain level. This almost never works in practice. When the moment arrives, emotion kicks in and the stop doesn't get honored. Always use hard stop losses placed directly in the market.