Where to Place a Stop Loss (and Why Percentage Alone Is Not Enough)

BullCalc Team · October 11, 2026 · 2 min read

A stop loss is the most important order in a trade. It decides how much you lose when you are wrong, and you will be wrong often. Yet many traders place stops by habit: always 2%, always 20% ROE. There is a better way.

The stop should mark where you are wrong

Every trade is based on an idea. "Price is holding support, so it should bounce." The stop belongs at the price that proves that idea wrong. If support breaks, the reason for the trade is gone, so that is where you get out.

Three common ways to place stops

1. Market structure

For a long, below the most recent swing low or support zone. For a short, above the most recent swing high or resistance. Leave a small buffer, because price often pokes just past obvious levels before reversing.

2. Volatility

Some traders use the average size of recent candles (for example the Average True Range indicator) and place the stop one or two times that distance away. This keeps the stop outside normal noise.

3. Time

If the trade does not move as expected within a set time, close it. This is often used alongside a price stop.

Why fixed percentages fail

A 2% stop on Bitcoin during a quiet weekend and a 2% stop on a small altcoin during news are completely different risks. Fixed percentages ignore volatility and structure, so they are either too tight (stopped out by noise) or too wide (losing more than needed).

Fit the size to the stop, not the stop to the size

Once the stop is in the right place, adjust the position size so the loss at that stop equals your planned risk. A wider stop means a smaller position, a tighter stop allows a larger one. The position size calculator does this for you.

If you think in percentages or ROE and need exact prices for your order, the stop loss and take profit calculator converts them instantly.

Checklist before you click

• Is the stop at a level that proves the idea wrong?
• Does the loss at the stop match your risk per trade?
• Is the liquidation price beyond the stop?
• Is the target at least far enough to give a sensible risk/reward?

This article is for education only and is not financial advice.