How to Set Stop Loss Orders Properly: A Practical Guide

A stop loss is an order that automatically closes your position at a predetermined price to limit your loss. Setting it properly means placing it at a level that protects your capital without getting triggered by normal market noise. The right stop loss is based on chart structure and volatility, not arbitrary dollar amounts or gut feelings.

Stop Loss Placement Methods

Structure-based stops: Place your stop just beyond a key technical level. For a long trade, put the stop below the recent swing low, below support, or below the moving average that defines the trend. If price reaches that level, your trade thesis is invalid.

For example: you buy a pullback at $50 after the stock bounced off the 20 EMA. The recent swing low is $48.50. Your stop goes at $48.40, just below that low. If price breaks $48.50, the pullback has become something worse, and you want out.

ATR-based stops: Use the Average True Range to set stops that account for normal price movement. Place your stop 1.5x to 2x the ATR away from your entry. If the 14-period ATR is $1.00, your stop is $1.50 to $2.00 away. This method adapts automatically to changing volatility.

Percentage-based stops: Risk a fixed percentage of your account on each trade (typically 1-2%). This does not directly tell you where to place the stop, but it tells you how much room you can afford. If you risk 1% of a $50,000 account ($500) and the chart-based stop is $2.00 away, you trade 250 shares.

The 1-2% Rule

The most important risk management rule: never risk more than 1-2% of your total account on a single trade. This is not optional; it is survival.

Here is why it works:

At 1% risk per trade, you can lose 10 trades in a row and still have 90% of your account.
At 5% risk per trade, 10 losses in a row leaves you with only 50%. You now need a 100% gain just to break even.
At 10% risk, a losing streak can destroy your account in days.

This rule forces you to adjust your position size based on your stop distance. Wider stop = fewer shares. Tighter stop = more shares. The dollar risk stays constant. See our position sizing guide for the exact formula.

Common Stop Loss Mistakes

Too tight: Placing your stop $0.10 away because you want a huge risk-reward ratio sounds smart until you get stopped out 8 times in a row by normal noise. Your stop needs room to breathe.

Too wide: A stop so far away that the loss would be devastating is not really a stop at all. If you cannot afford the distance the chart requires, either trade smaller or skip the trade.

Moving your stop further away: This is the deadliest mistake. Price approaches your stop, and you move it wider to “give it more room.” You are converting a small, planned loss into a large, unplanned one. Never do this.

No stop at all: Some traders use “mental stops,” telling themselves they will exit if price reaches a level. Under stress, mental stops almost never get executed. Use actual orders.

When to Move Your Stop (The Right Way)

You should only move your stop in one direction: toward profit. As your trade moves in your favor:

Move your stop to break-even once price has moved 1x your initial risk in your favor
Trail your stop below each new higher low (for longs) as the trend develops
Use a trailing stop based on the moving average or ATR

This locks in profits while giving the trade room to continue working.

Key Takeaways

Place stops based on chart structure (below support, swing lows) or ATR, not arbitrary levels
Never risk more than 1-2% of your account on a single trade
Wider stops require smaller position sizes to keep dollar risk constant
Never move a stop loss further from your entry; only move it toward profit
Use actual stop orders, not “mental stops” that you will ignore under pressure

Frequently Asked Questions

Should I use market stop or limit stop orders? Market stop orders guarantee execution but may have slippage in fast markets. Stop-limit orders guarantee price but may not fill if the market gaps past your limit. For most traders, market stops are safer because getting out at a slightly worse price beats not getting out at all.

Where should I put my stop for a day trade? Below the most recent 5-minute or 15-minute swing low for longs, or above the most recent swing high for shorts. A 1x to 1.5x ATR stop on your intraday timeframe is another solid approach.

Do prop firms require stop losses? Most prop firms do not technically require you to use stop losses on every trade, but they enforce maximum drawdown limits that essentially force disciplined risk management. Blowing past the daily or total drawdown limit ends your account.

Risk Disclaimer: Trading involves substantial risk of loss. Past performance is not indicative of future results. See our full risk disclaimer.