GLOSSARY
Stop loss
The level where you decide, in advance, that the trade idea was wrong.
Updated 2026-09-04 · Educational content · No broker owns this site
Quick answer. A stop loss is an order that closes a trade once price reaches a level you chose in advance. It caps the planned loss on that trade, but it does not guarantee the exact exit price in fast or gapping markets.
A stop loss is a resting order that closes your position when price reaches a level you picked before entering. Its job is not to make the trade safe — it is to make the size of the damage a decision instead of an accident.
Because the stop distance and your position size together fix the cash at risk, the stop is also what makes lot size a calculation rather than a guess.
How much does a stop loss cost?
Buy EUR/USD at 1.1000 with one mini lot, stop at 1.0980:
| Step | Working | Result |
|---|---|---|
| Distance to stop | 1.1000 − 1.0980 | 20 pips |
| Value of one pip | 0.0001 × 10,000 units | $1.00 |
| Planned loss | 20 × $1.00 | $20 |
The number is known before you click. That is the whole benefit — not that $20 is small, but that it was chosen.
Does a stop loss guarantee your exit price?
No, and this is the part most beginner material skips. When price reaches your level the stop turns into a market order, so it fills at the next price available. In fast markets, or over a weekend gap, that price can be worse than the level you set. The CFTC makes the same point in its retail forex advisory: stops limit exposure, they do not guarantee a fill at the stop price.
Some brokers offer a guaranteed stop for a fee. Everything else is a plan that usually holds and occasionally does not — which is why "my stop was only $20" is a planned figure, not a promise.
What do beginners get wrong about stop losses?
| Mistake | Why it hurts |
|---|---|
| Placing the stop where the loss feels comfortable | The market does not know your comfort level; a stop that tight gets hit by ordinary noise |
| Widening the stop after entry | Turns the loss you accepted into one you never agreed to |
| Moving the stop to break even too early | A normal pullback closes a trade that was working |
| Trading without one because "I'll watch it" | Leaves the loss open-ended the moment attention breaks |
The order of operations that avoids most of this: decide where the idea is wrong, put the stop there, then size the position so that distance costs what you planned to risk.
Related terms
- Take profit — the same idea on the winning side
- Pip · Lot · Mini lot
- Lesson: risk per trade · Pre-trade checklist
Frequently asked questions
Is a stop loss guaranteed?
Not usually. A stop becomes a market order when it is triggered, so it fills at the next available price. In fast or gapping markets that fill can be worse than the level you set. A few brokers sell guaranteed stops as a paid feature.
Can I trade forex without a stop loss?
You can, but the loss is then open-ended unless you have another strict exit rule and you are at the screen to apply it. For a beginner that is how a single trade turns into an account-sized loss.
Should I move my stop loss to break even?
Moving the stop to your entry price removes most of the original risk, but doing it too early closes trades during normal pullbacks. It also is not truly free: spread, commission and slippage mean the exit may not land exactly at zero.
Sources
- CFTC Customer Advisory — Eight Things You Should Know Before Trading Forex (2026)
- CFTC Office of the Chief Economist — Stop Orders in Select Futures Markets (2026)
- FirstPip knowledge base — risk/breakeven-stop-and-trailing-stop, risk/risk-per-trade