Stop Loss Calculator
Two tools in one: a quick "what price is X% below my entry?" calculator, plus a full trade planner with risk, reward and R:R
Just need a sell price? Enter the current price and a stop loss percentage — the price you should sell at appears below.
Add take-profit and position size to see total dollar risk, reward, R:R ratio and position cost. Stop loss % and price stay in sync — edit either one.
// What Is a Stop Loss?
A standing order with your broker that automatically closes a trade once price reaches a level you choose ahead of time. It removes the emotion from the "do I cut it?" decision and caps the dollar damage of any single trade.
// Long vs Short
For a long (you bought), the stop sits below the entry — sell if price drops. For a short (you sold first), the stop sits above entry — buy back if price rises.
// Choosing a %
Day trades typically use 0.5–2%, swing trades 3–8%, longer-term positions 10–20%. Wider stops mean smaller positions for the same dollar risk.
// Take Profit
The mirror of a stop loss — an order to lock in gains automatically when price hits your target. Setting both stop and target before entry is the core of disciplined trading.
// Risk : Reward
The ratio of how much you lose if wrong vs. how much you make if right. A 1:3 R:R lets you be wrong 75% of the time and still break even.
// Worked Example
Bought a stock at $100 and want a 10% stop loss? Sell price = $100 × (1 − 0.10) = $90. On 100 shares that's a $1,000 maximum loss.