How to Set a Stop Loss

11 min read · Stop Loss · ATR

Why a stop-loss is mandatory

A stop-loss is a pre-defined price level where you exit a trade at a loss. Without a stop-loss, a single trade can wipe out months of profit. Even experienced traders always use stop-losses.

Method 1: Support/Resistance Levels

The most common approach — place your stop just below a support level (for longs) or above a resistance level (for shorts). If the price breaks that level, the setup is invalidated and it's better to exit.

Worked example: setting a stop on BTC

BTC trading at $65,000. You see it just bounced off the $64,200 support level on the 4h chart. You want to long with a 1:2 risk-reward setup. Step 1: find the invalidation level — the support at $64,200. If price breaks below, your bullish thesis is wrong. Step 2: add buffer so you are not stopped by wick noise — 0.5% buffer = $321. Stop = $64,200 − $321 = $63,879. Step 3: round to a non-obvious number — not $63,879 (too precise) and not $63,800 (too round, clustering). Use $63,820. Step 4: distance from entry: $65,000 − $63,820 = $1,180. Step 5: if risking $100, size = $100 ÷ $1,180 = 0.0847 BTC. Step 6: target at 1:2 = $65,000 + $2,360 = $67,360.

Method 2: ATR-Based Stop

ATR (Average True Range) is a volatility indicator. ATR-based stops account for current market volatility and are more adaptive.

Our calculator supports ATR mode — enter the ATR value and multiplier, and the stop-loss is calculated automatically.

ATR-based stop example (TSLA)

TSLA at $245 with ATR(14) = $8. You want a stop that survives normal volatility. Conservative: 2× ATR = $16. Stop = $245 − $16 = $229. Aggressive (more likely to hit): 1× ATR = $8. Stop = $237. In the calculator, toggle "ATR mode," input ATR value ($8) and multiplier (2), and the stop-loss is computed automatically. The real value of ATR is that your stops adjust to current volatility. In quiet markets ATR shrinks and your stops tighten; in volatile markets ATR expands and stops widen — so you are less likely to be stopped by random noise.

Method 3: Candle Structure

When entering after a pin bar or engulfing candle — place the stop beyond the pattern's wick. This gives a clear technical invalidation level.

Trailing stops — lock in profit

A trailing stop moves with the price in your favor but never against you. Example: you enter BTC at $65,000 with stop at $63,800. Price moves to $67,000. You move your stop to $65,800 — now you have a guaranteed $800 profit per coin if the trade reverses. Common trailing methods: (1) Fixed percentage — always trail by X% below the high. (2) ATR trailing — trail by N × ATR below the high. (3) Structure-based — move the stop to below each new higher low on the chart. The calculator helps with initial sizing; for trailing stops you adjust manually on the exchange as structure develops.

Mental stops vs hard stops

A "mental stop" means you plan to exit at a certain price but do not place an order on the exchange. A "hard stop" is a real order sitting in the order book. For 99% of retail traders, always use hard stops. Mental stops fail exactly when you need them — during strong adverse moves when emotion takes over ("it will bounce back," "I'll wait a little more"). Hard stops execute without emotion. The only legitimate reason to use a mental stop is in exotic markets where your order would be visible to market makers who could run it — but this rarely applies to crypto or US stocks.

Special case: earnings and news events

For stocks, standard stops are unreliable around earnings announcements — the stock can gap 10–20% on the report, blowing through any normal stop. Two approaches: (1) Exit the position before the earnings release and re-enter after. (2) Size the position assuming the stop will gap — use the ATR of earnings-day moves (often 2–3× normal) for sizing, accepting that the realized loss could be larger than planned. Same principle applies to crypto around major events like FOMC announcements, ETF decisions, or major exchange news — plan for gaps.

Common Mistakes

• Round numbers — stops near $50,000 or $100 get triggered more often due to order clusters
• Too tight — a stop within normal price volatility will constantly get hit
• Too wide — to fit your risk budget you'll have to reduce position size to almost nothing
• Moving stop into loss — when a trade goes badly some traders widen the stop. This is a dangerous habit

Stop Hunts and How to Avoid Them

Market makers often hunt obvious stops — pushing price beyond key levels before reversing. To avoid this: place your stop a bit further from the obvious level, and never place it right at round numbers.