Learning note · Stop loss · Risk
Stop loss placement basics
Where to put a stop loss so it means something, how stop distance and position size work together, and the habits that undo a good stop.
A stop loss answers one question: at what price is this trade idea wrong? Getting that answer first, and sizing the trade around it, is one of the most useful habits a beginner can build.
Start from the idea, not the money
A common mistake is to pick a stop because of the money: "I'll risk 20 pips because that feels like enough." The market does not know how much you want to lose. A better approach is to ask where price would have to go to show that your reason for the trade no longer holds, and put the stop just beyond that.
Examples of logical places, depending on the idea:
- Just beyond a recent swing high or low, or the edge of a range, if the trade relies on that level holding.
- On the other side of an area of support or resistance you are trading from.
- A distance based on how much the pair normally moves, so that ordinary noise does not trigger the stop.
None of these is guaranteed to work. They simply tie the stop to something you can explain and review later.
Then size the position to the stop
Once the stop distance is fixed, the position size decides how much money is at risk. Wider stop, smaller position; tighter stop, larger position. The money at risk can stay the same.
$10,000 account, 1% risk = $100
20-pip stop on EUR/USD: $100 ÷ (20 × $10) = 0.50 lots
50-pip stop on EUR/USD: $100 ÷ (50 × $10) = 0.20 lots
Both trades lose about $100 if the stop is hit at its level. The 1% figure is an example used in many educational materials, not a recommendation for your situation. The position size calculator does this calculation.
Mind the spread and the noise
Remember which price triggers the stop. On most platforms, a buy is closed at the bid and a sell at the ask, so a sell's stop can be hit when the ask touches it even if the chart (usually showing the bid) does not quite reach it. A stop only one or two spreads away will often be hit by normal fluctuation.
What a stop cannot do
A stop is not a guaranteed exit price. Over a weekend gap or a sudden news move, the order may fill at the next available price, which can be well beyond the stop. Some brokers offer guaranteed stops for a fee; standard stops are not guaranteed.
Habits that undo a good stop
- Moving it further away when the trade goes against you. This is the most common way a small, planned loss becomes a large one.
- Not setting one "because you will watch the trade". Connections drop, and people freeze.
- Setting it, then sizing up because the stop is tight, without checking whether the tight stop makes sense.
- Removing it before news, which is exactly when it is most needed.
Moving a stop in your favour
Moving the stop to your entry price once a trade is in profit (to breakeven), or using a trailing stop, can protect gains. It also means some trades will be closed by normal pullbacks before they reach the target. There is no free lunch; decide your rule in advance and apply it consistently.
Practise in the practice simulator: set the stop first, use "size by risk" to get the lot size, and try the "stop to entry" button on a winning trade. Read more in the risk management guide.
Education, not advice. This note explains a concept with illustrative numbers. It is not a recommendation to trade. Currency trading carries risk, and losses can exceed expectations. See the risk disclaimer.