Stop losses, and where to actually put one

A stop is not a prediction. It is the price at which your idea is proven wrong.

A stop-loss is an instruction to close a position if price reaches a level you chose in advance. That is all it is mechanically. What makes it difficult is not the mechanism but the decision behind it.

Stop-market versus stop-limit

Stop-market becomes a market order when triggered. It will fill, but the price is whatever the book gives you — which in a fast move can be noticeably worse than your level.

Stop-limit becomes a limit order when triggered. You control the price, but in a violent move it may not fill at all, leaving you in a losing position with no protection.

For most retail traders, stop-market is the safer default. A slightly worse fill is survivable. An unfilled stop during a crash is not.

Where to place it

1. At invalidation, not at a comfortable distance. Ask: at what price is my reason for this trade no longer true? That is the level.
2. Beyond the obvious cluster. Everyone puts stops just under the recent low. Give the crowd a wide berth — a little further costs you position size, not money.
3. Outside normal noise. Check what a typical daily range looks like for that pair. A stop inside ordinary volatility is a coin flip.
4. Never at a round number. Round figures attract orders for psychological reasons alone.

Position size comes second

Once the stop is fixed, the size is arithmetic: the amount you are willing to risk divided by the distance to the stop. That order matters. Choosing size first and then squeezing the stop to fit is the single most common way beginners lose accounts.

The three ways traders place stops, and which works

By percentage. "I always use a 3% stop." Simple, and wrong most of the time — it ignores what the chart is doing. A 3% stop on a calm asset may be far outside noise; on a volatile one it is inside ordinary daily movement.

By dollar amount. "I never risk more than $50." This is the right way to think about size, but it is not a way to place a stop. It leads to squeezing the stop until the loss fits, which puts it in exactly the wrong place.

By structure. "Below the swing low that defines this setup." This is the only method that answers the actual question — at what price is my reason for being in this trade no longer true? Everything else is arithmetic that follows from it.

The correct order is always: find the invalidation level, measure the distance, then calculate size from your risk budget.

Accounting for volatility

The same stop distance means completely different things across assets. A 3% stop might be well outside normal movement for one coin and inside the average daily range of another — which means it will be hit by noise regardless of whether the idea was right.

Check the volatility ranking panel before deciding a stop distance is reasonable. If an asset routinely moves 6% a day, a 2% stop is not tight risk management; it is a coin flip with extra fees.

The practical consequence surprises people: on more volatile assets you need a wider stop and therefore a smaller position. Volatility does not change how much you risk. It changes how much you can buy.

Moving a stop — the one rule that is not negotiable

Moving a stop to break-even after a favourable move is legitimate and often wise. Trailing a stop behind a trending position is legitimate. Deciding, while a position is losing, that your invalidation level was "too tight" is not analysis — it is the trade negotiating with you.

If you find yourself considering it, the honest response is to close the position. You have lost confidence in the plan, and staying in without one is gambling.

Stops on leveraged positions

Two exits exist: yours and the exchange's. Yours must come first, with room to spare.

1. Place the stop at structural invalidation, as always.
2. Measure that distance as a percentage.
3. Check where liquidation sits at your intended leverage.
4. Require liquidation to be at least twice as far as the stop. Below that ratio, ordinary noise can remove the position before your plan does — and liquidation costs the whole margin plus a penalty, not the small amount you defined as risk.

The position size calculator performs this check and warns you when the ratio breaks, which takes about fifteen seconds against the alternative.

When not having a stop is defensible

There is one honest exception, and it is narrower than people pretend. A spot position, sized so that a total loss would not change your life, held on a thesis measured in years, does not require a stop — because there is no forced exit and no invalidation level short of the thesis itself failing.

That is a legitimate approach. What is not legitimate is starting a leveraged trade with a stop, removing it when it is about to be hit, and reclassifying the position as a long-term investment. That reclassification happens after the fact, to avoid accepting a loss, and it is how accounts are ended.

Common questions

Should I use a mental stop instead of placing one?

Almost never. A mental stop requires you to act correctly at the exact moment you are least capable of it, and it fails silently when you are asleep or away. Place the order.

Do exchanges hunt stop-loss orders?

Stops cluster at obvious levels because everyone was taught the same rule, and price is drawn toward pools of liquidity. Whether any venue targets them deliberately is unprovable — but the effect is real, and the defence is the same either way: place your stop beyond the crowd, not inside it.

What if the market gaps past my stop?

A stop-market order fills at the next available price, which in a gap can be considerably worse. This is unavoidable and is part of why position sizing matters — the size should be survivable even with a poor fill.