# How to Set a Stop-Loss 4 Methods Compared

> Learn how to set a stop-loss with structure, ATR, percentage and time stops, compared on one trade, then size the position from the stop and review it.

Canonical: https://www.journalx.io/guides/how-to-set-a-stop-loss

To set a stop-loss, first write down the price that proves your trade idea wrong, then choose a method: structure, ATR, percentage or time. Put the stop just beyond that level, check it sits outside normal daily noise, and size the position from the stop distance. Place the order with the entry and review stops with data.

Learning how to set a stop-loss comes down to answering one question before you enter: at what price is this trade wrong? A [stop-loss](/glossary/stop-loss) is the order that exits you at that price, and the distance from entry to stop becomes your 1R, the unit every result is measured in. The glossary entry covers what a stop is. This guide walks through where to put one.

There are four common ways to choose the level: the chart's structure, a multiple of volatility, a fixed percentage, and a time limit. To make the differences concrete, every step below uses the same trade. A stock rallied to $52.40, pulled back to a swing low at $47.40, and reclaimed $50.00, where you buy. Its 14-day average true range (ATR) is $1.60, and your account is $25,000 with a 1% [risk per trade](/glossary/risk-per-trade) rule, so you will lose $250 if the stop is hit.

## Step 1: Write down what would prove the trade wrong

Every stop starts as a sentence, not a number. For the trade above: "This pullback is over and buyers are back in control. If price breaks the $47.40 swing low, that is wrong." Write the sentence in your [pre-trade plan](/glossary/pre-trade-plan) before you look at how many shares you could buy.

The sentence does two jobs. It gives the stop a reason, so you are less tempted to move it later. And it tells you which methods fit the trade. A setup with a clear invalidation level points to a structure stop. A setup that depends on price moving soon, like a breakout, also needs a time limit. If you can't write the sentence at all, the trade probably isn't a defined [setup](/glossary/setup) yet.

## Step 2: Pick a stop-loss method

Here are the four methods applied to the same $50.00 entry, each sized to the same $250 of risk.

![The same long trade entered at $50.00 with three possible stops: a 3% stop at $48.50, a structure stop at $47.20 below the $47.40 swing low, and a 2 × ATR stop at $46.80, plus a time stop five days after entry. Sized for $250 of risk, they allow 166, 89 and 78 shares.](https://assets.journalx.io/marketing/guides/how-to-set-a-stop-loss/stop-methods-compared.avif)

### Method 1: The structure stop

A structure stop goes just beyond the price level that would invalidate the setup: below a swing low for a long, above a swing high for a short, or on the far side of a range. In the example, the swing low is $47.40, so the stop goes at $47.20, 20 cents beyond it. That buffer keeps you out of the cluster of orders resting exactly on the obvious level.

The stop distance is $2.80. Of the four methods, this is the only one that answers the Step 1 question directly, which is why it is the default for most discretionary setups. Its weakness is that the "right" level is a judgment call, and two traders can read the same chart differently. Write down which level you use for each setup so the choice stays consistent.

### Method 2: The ATR (volatility) stop

An ATR stop sits a multiple of average true range away from your entry. Average true range, developed by J. Welles Wilder and introduced in his 1978 book, measures how far an instrument typically moves per bar, including gaps ([StockCharts ChartSchool](https://chartschool.stockcharts.com/table-of-contents/technical-indicators-and-overlays/technical-indicators/average-true-range-atr-and-average-true-range-percent-atrp)). The common default is 14 periods.

With a $1.60 ATR, a 2 × ATR stop sits $3.20 below the entry, at $46.80. A 1.5 × ATR stop would sit at $47.60, which is *above* the $47.40 swing low. That is the classic ATR trap: the multiple looks reasonable, but it puts the stop where the setup isn't actually broken yet. Many traders use 1.5 to 3 times ATR. Whichever multiple you pick, check where it lands on the chart.

The strength of an ATR stop is that it adapts. The same rule gives a wide stop on a volatile stock and a tight one on a quiet stock, and it works the same way on futures, forex and crypto.

### Method 3: The percentage stop

A percentage stop exits a fixed percentage away from entry, for example 3%. On a $50.00 entry that is $1.50, so the stop sits at $48.50.

It is the easiest rule to follow, and that's its appeal. But look at where it lands: above the swing low and inside the range of the last few bars. A completely normal retest of the pullback low would stop you out before the setup had failed. The distance is also less than one ATR, which means an average day's movement can reach it. A percentage says nothing about the chart or the instrument, so 3% is generous on a slow utility stock and tight on a volatile small cap.

If you like a percentage rule, use it as a ceiling ("no stop wider than 5%") rather than as the method that places the stop.

### Method 4: The time stop

A time stop exits a trade that hasn't worked within a set number of bars or days. For the example trade: "If price hasn't reached +1R ($52.80) within five sessions, exit at the close." It frees up capital and attention from trades that are going nowhere.

A time stop doesn't replace a price stop. It has no price level, so it can't define 1R or size the position. Use it alongside one of the other three. It suits setups whose whole premise is that something should happen soon, like a breakout or a news reaction.

### The four methods side by side

| Method        | Stop   | Distance | In ATR | Shares for $250 risk  | Fits best when                                       |
| ------------- | ------ | -------- | ------ | --------------------- | ---------------------------------------------------- |
| Structure     | $47.20 | $2.80    | 1.75   | 89                    | the setup has a clear invalidation level             |
| 2 × ATR       | $46.80 | $3.20    | 2.0    | 78                    | you trade many instruments with different volatility |
| 3%            | $48.50 | $1.50    | 0.94   | 166                   | you need a simple ceiling, checked against the chart |
| Time (5 days) | none   | none     | none   | set by the price stop | the setup should work quickly or not at all          |

The structure and ATR stops land close together here, about 1.75 and 2 ATR below the entry, which is a good sign. When the chart and the volatility measure agree, the stop is probably outside normal noise and at a level that means something.

## Step 3: Check the stop against normal noise

Before you accept a level, run three quick checks:

1. **Is it outside an average bar's range?** Divide the stop distance by the ATR for the timeframe you trade. Below 1 means an ordinary bar can reach the stop. For a swing trade on daily bars, that is usually too tight.
2. **Is it beyond the obvious level, not on it?** Round numbers and visible swing points collect resting orders. A small buffer, a few cents on a stock or a few ticks on a future, costs little and keeps you away from the crowd.
3. **Does the reward still make sense?** A wider stop needs a farther target for the same [risk-reward ratio](/glossary/risk-reward-ratio). A 2R [take-profit](/glossary/take-profit) is $55.60 with the structure stop, $56.40 with the 2 × ATR stop and $53.00 with the 3% stop. If the nearest resistance sits at $54.00, the wide-stop version may not be worth taking at all.

If a stop fails these checks, don't shrink it to make the trade work. Skip the trade or wait for a better entry closer to the invalidation level.

## Step 4: Size the position from the stop

The stop comes first and the position size second. [Position sizing](/glossary/position-sizing) is just division:

**Shares = dollar risk ÷ stop distance**

With $250 of risk, the structure stop gives $250 ÷ $2.80 = 89 shares. The 2 × ATR stop gives $250 ÷ $3.20 = 78 shares. The 3% stop gives $250 ÷ $1.50 = 166 shares. Each version loses about the same $250 if the stop is hit. A wider stop doesn't mean more risk, it means a smaller position.

Choosing a share count first and then placing the stop wherever the loss feels comfortable is the most common way stops end up in the middle of normal noise. The chart sets the stop, the stop sets the size, and the account sets the dollar risk. Never the other way round.

## Step 5: Place the order with the entry

A stop only protects you if it is actually in the market. Most platforms let you attach the stop to the entry as a bracket, so it goes live the moment you're filled and there is no window where you hold an unprotected position.

Know which order type you are using. A standard stop order becomes a market order when triggered, and the SEC is explicit that "the stop price is not the guaranteed execution price for a stop order" ([SEC investor bulletin](https://www.investor.gov/introduction-investing/general-resources/news-alerts/alerts-bulletins/investor-bulletins-15)). If the stock gaps from $49.00 to $46.00 overnight, a $47.20 stop fills near $46.00, and the loss is bigger than 1R. That difference is [slippage](/glossary/slippage), and it is why the stop caps your planned risk rather than your actual risk. A stop-limit order protects the fill price but may not fill at all in the same gap.

## Step 6: Leave it alone, then review it with data

Once the order is in, the plan says the stop can only move in one direction: toward locking in more of the trade. Widening it after entry turns a $250 loss into a $400 or $500 loss, and it also breaks your records, because the trade is still measured against the original 1R.

Whether your stops are set well is a question your journal can answer after a few dozen trades:

- **Look at the [maximum adverse excursion](/glossary/maximum-adverse-excursion) of your winners.** MAE is how far a trade went against you before it closed. If most winners never went past −0.5R, your stops may be wider than they need to be. If many losers hit −1R and then went on to reach the target, the stops may sit inside the noise.
- **Compare methods on the same setup.** Tag which method placed each stop and compare the results in [R-multiples](/glossary/r-multiple), not dollars, so different position sizes don't distort the comparison.
- **Count moved stops.** Track the trades where the stop changed after entry and what those changes cost.
- **Wait for a real sample.** Twenty trades can't tell a slightly tight stop from bad luck. [How many trades you need to judge a strategy](/blog/how-many-trades-to-evaluate-a-strategy) covers why, and [how to create a trading plan](/guides/how-to-create-a-trading-plan) covers how to write the stop rule down so you can test it.

A stop set this way stops being a guess. It sits at the price where the idea fails, it is far enough from entry to survive a normal day, it sets the position size, and your own data can check it. Change the rule only when that data tells you to, and write the change into your plan.

JournalX records your planned entry, stop and target before the trade, then shows each result in R next to what you planned, including the trades where the stop moved.