How far should the stop be?

There's no fixed number. It depends on each instrument's structure and volatility, on each timeframe. The right way: let the market decide the stop distance, then adjust size to fit your risk.

Should I use a mental stop?

Only if you're disciplined enough to actually exit at the level. Beginners should use a hard order on the exchange.

Is a stop always needed?

For most people and most strategies: yes. Some styles (e.g. long-term investing with different risk management) differ, but for trading an exit-when-wrong is essential.

I got stopped out and then price went my way — what now?

Normal and impossible to fully avoid. If it happens too often, review: is the stop too tight, should you use ATR to give price room.

Stop Loss | 2AiTrading

1. What is a Stop Loss

A stop loss is a price level you decide in advance to exit a losing trade, to cap how much you can lose. When price reaches it, the trade is closed — either by an order resting on the exchange, or by your own discipline.

Put simply: before entering, you answer the question "if I'm wrong, how much am I willing to lose before I admit it and get out?" That answer is your stop loss.

2. Why it matters

Caps the damage: a trade with no stop can lose without limit until the account is gone. A stop turns the loss from "unlimited and vague" into "fixed and known in advance".
Makes calculation possible: once you know how much you'll lose if wrong, you can size the position and compute the risk/reward. Without a stop, neither can be calculated.
Protects you from emotion: a stop set with a clear head (before entry) is more objective than a decision made mid-loss in a panic.

3. Ways to set a Stop Loss

Each method answers "where to put the stop" with a different logic:

By structure (Structure / Swing): place the stop just below the nearest low (for longs) or above the nearest high (for shorts). Logic: if price breaks that structure, the original idea was wrong.
By volatility — ATR: use the ATR indicator (Average True Range) to measure typical movement, then place the stop a multiple of ATR away (e.g. 1.5×ATR). Logic: let price "breathe" according to its own volatility, avoiding being taken out by ordinary noise.
By percentage (%): place the stop a fixed percentage away (e.g. 5%). Simple, but ignores structure and volatility.
By fixed dollar amount (Dollar Stop): exit when the loss hits an absolute number (e.g. lose $100 and you're out). Easy but mechanical.
By time (Time Stop): if after a set period the trade hasn't moved as expected, exit even without a big loss. Logic: tied-up capital is itself a cost.
By broader volatility: like ATR but using other volatility measures (standard deviation, Bollinger Bands…).
Mental Stop (in your head): no order on the exchange; you watch and close manually at the level. Only for the highly disciplined; beginners easily "move the stop in their head" and hold losers.
Trailing Stop: when a trade is in profit, move the stop along with price to protect gains. This is both a stop and a dynamic take-profit.

4. How to apply — which method when

Trading by structure / price action → Structure Stop fits.
Highly volatile markets that hunt wicks → ATR Stop gives price room.
Beginners who want simplicity → % or Dollar Stop, as long as it's consistent.
Intraday strategies that don't want dead trades → consider a Time Stop.
A trade already in profit you want to let run → Trailing Stop.

General rule: the stop should come from the market (where you're proven wrong) first, then from your wallet (how much you can lose). If a market-sensible stop is too far for your account, the correct fix is to reduce size, not to move the stop closer without reason.

5. Worked example

Say a stock is at 100. You buy expecting the uptrend to continue, and the nearest low is 96.

Structure Stop: stop at 95.5 (just below the 96 low). If price breaks 96, the up-structure is broken → exit.
ATR Stop: if ATR = 3, place the stop 1.5×ATR = 4.5 away → stop at 95.5. (Close to the structure stop — a sign the level is sensible.)
Percentage Stop: 5% → stop at 95.

The distance from 100 to 95.5 is 4.5 points. That number is the "risk per share", used to size the position (see the Position Size article).

Illustrative chart (updating).

6. Common mistakes

No stop loss — hoping price comes back; the number-one cause of blown accounts.
Stop too tight — taken out by ordinary noise, then price goes your way.
Stop too wide — when hit, the loss is too large versus the expected gain.
Moving the stop away as price approaches — turning a small planned loss into a large unplanned one.
Setting the stop by your wallet, not the market — picking a level "you can afford" while ignoring where the idea is actually proven wrong.
Placing the stop right at obvious round numbers / highs / lows — where many others cluster, easily hunted.

7. FAQ

How far should the stop be? There's no fixed number. It depends on each instrument's structure and volatility, on each timeframe. The right way: let the market decide the stop distance, then adjust size to fit your risk.
Should I use a mental stop? Only if you're disciplined enough to actually exit at the level. Beginners should use a hard order on the exchange.
Is a stop always needed? For most people and most strategies: yes. Some styles (e.g. long-term investing with different risk management) differ, but for trading an exit-when-wrong is essential.
I got stopped out and then price went my way — what now? Normal and impossible to fully avoid. If it happens too often, review: is the stop too tight, should you use ATR to give price room.

8. Tools

_(Coming)_ ATR stop-distance calculator.
See also the tools in the Position Size article.

9. Checklist before entering

☐ Did I define the stop before entering?
☐ Is the stop based on the market (structure/volatility), not emotion?
☐ How many points is the distance from entry to stop?
☐ With that distance, is size calculated so risk stays within my limit?