TRADING
Stop Loss Calculator — Protect Your Trades
By Worldtickers ·
Use our free stop loss calculator to determine the ideal stop loss price for any trade. Enter your entry price, risk amount, and position size to calculate the optimal stop level.
This stop loss calculator — protect your trades tool focuses on use our free stop loss calculator to determine the ideal stop loss price for any trade. Enter your entry price, risk amount, and position size to calculate the optimal stop level. Use it to size trades, compare risk levels, estimate market exposure, and review entries, exits, volatility, leverage, and stop levels before committing capital.
Stop Loss Calculator
Stop Loss Calculator
Calculate the ideal stop loss price for a trade based on your risk tolerance and position size.
What Is a Stop Loss?
A stop loss is a pre-placed order that automatically exits a trade when the price reaches a specified level against you. It is the single most important risk management tool in trading because it removes the emotional decision of when to cut a loss. Without a stop loss, you are relying on your discipline to exit a losing trade under the pressure of watching real money evaporate — a strategy that fails for the vast majority of traders. A stop loss automates this decision, ensuring your maximum loss is defined before the trade is even entered.
The stop loss is not a prediction of where the market will go. It is a statement of where your trade thesis is invalid. If you buy a stock at $50 because you believe it will bounce from support at $48, your stop should be below $48 — because if the price breaks below support, your thesis is wrong and you should not be in the trade. The stop loss is not a magic number that prevents losses; it is a纪律 mechanism that limits losses to a predetermined amount and prevents small losses from becoming account-destroying disasters.
There are several types of stop losses. A fixed stop is placed at a specific price. A percentage stop is placed at a fixed percentage from entry. An ATR-based stop uses the Average True Range indicator to adapt to volatility. A trailing stop moves in the direction of the trade, locking in profits. Each type has its uses, and the best choice depends on your trading style, time horizon, and the market conditions. The stop loss calculator above helps you determine the optimal stop price based on your risk parameters.
How to Use This Calculator
This stop loss calculator requires four inputs and produces two outputs. The inputs define your trade parameters, and the outputs tell you the optimal stop loss price and the dollar risk per share.
Entry Price
Enter the price at which you plan to enter the trade. This is the starting point for the stop loss calculation because both your risk and your stop distance are measured relative to this price. If you are buying a stock at $75, enter $75. If you are shorting a forex pair at 1.1200, enter 1.1200. The entry price determines where the stop loss should be placed relative to the market structure.
Risk Amount Per Share
Enter the maximum dollar amount you are willing to lose per share or per unit. If you are buying a stock at $50 and are willing to lose $3 per share, enter $3. This dollar risk determines how far your stop loss should be from your entry. The calculator divides this amount by your position to determine the exact stop price. For a $50 entry with $3 risk, the stop would be at $47.
Position Size
Enter the number of shares, lots, or contracts you plan to trade. The position size combined with the per-share risk determines your total dollar risk on the trade. If you plan to buy 200 shares at $50 with a $3 per share risk, your total risk is $600. The calculator uses this information to verify that your stop loss level produces a total loss that matches your intended risk.
Reading the Outputs
The calculator outputs the stop loss price and the total dollar risk. The stop loss price is the level at which your order will be triggered to exit the trade. The total dollar risk confirms that your position size and stop distance produce the intended maximum loss. If the total risk is higher than you planned, reduce your position size or widen your stop. If it is lower, you can either increase your position size or tighten your stop for a better risk-reward ratio.
The Formula Explained
The stop loss price formula for a long position is: Stop Loss = Entry Price − Risk Amount Per Share.
The total risk formula is: Total Risk = Position Size × Risk Amount Per Share.
For example, if you enter at $50 with a $3 per share risk, your stop loss is $50 − $3 = $47. If you buy 200 shares, your total risk is 200 × $3 = $600. The formula is straightforward — the stop loss is simply the entry price minus the per-share risk. The more nuanced part of stop loss placement is determining where to set the risk amount, which depends on the market structure rather than a formula.
For a short position, the formula reverses: Stop Loss = Entry Price + Risk Amount Per Share. If you short at $50 with a $3 risk, your stop is at $53. The total risk formula remains the same. The key principle is that the stop loss is always on the side of the trade opposite to your profit direction — below entry for longs, above entry for shorts.
Real-World Examples
Example 1: Technical Stop Below Support
You identify a stock trading at $60 with strong support at $57. You plan to buy 150 shares. Your analysis suggests that if the stock breaks below $57, the uptrend is invalidated. You set your stop at $56.50 (just below support), giving you a $3.50 risk per share. Total risk: 150 × $3.50 = $525. The calculator confirms that this stop produces the correct total risk. If the stock drops to $56.50, you exit with a $525 loss — painful but controlled. If the stock holds support and rallies, your upside is unlimited.
Example 2: Percentage Stop for Day Trading
A day trader enters a stock at $200 with a 1% stop loss. The stop price is $200 − $2 = $198. The trader buys 250 shares. Total risk: 250 × $2 = $500. The percentage stop provides a quick, objective exit without requiring detailed technical analysis. This approach works well for day traders who need fast decisions and consistent risk parameters across many trades. The trade-off is that percentage stops do not account for market structure, so they may be too tight in volatile conditions or too wide in quiet conditions.
Example 3: ATR-Based Stop for Volatile Markets
A stock has a 14-day ATR of $4.50. You enter at $80 and place your stop at 1.5x ATR below entry: $80 − $6.75 = $73.25. You buy 100 shares. Total risk: 100 × $6.75 = $675. The ATR-based stop adapts to the stock's natural volatility, providing enough room for normal price swings while still protecting against a genuine reversal. This method is particularly useful for stocks with high or variable volatility where fixed percentage stops would be either too tight or too loose.
Tips and Limitations
Place Stops at Technically Significant Levels
The best stop losses are placed at levels where a break would invalidate your trade thesis. This means below support for long positions, above resistance for short positions, beyond a moving average that defines the trend, or past a Fibonacci level. Arbitrary stop distances (like exactly $5 or exactly 2%) ignore market structure and often result in being stopped out of trades that would have been profitable. Let the chart tell you where the stop should be, then use the calculator to determine your position size based on that stop distance.
Never Widen a Stop Loss
Once a stop loss is placed, it should only move in one direction: toward your entry (locking in profits). Moving a stop further from your entry to avoid being stopped out is one of the most destructive habits in trading. It increases your risk beyond what you originally planned and typically turns a small, manageable loss into a large, account-damaging one. If you find yourself wanting to widen a stop, it is almost always better to accept the loss, exit the trade, and re-enter later if the setup still looks valid.
Account for Gaps and Slippage
Stop losses are not guaranteed to fill at the exact price you specify. Overnight gaps, fast-moving markets, and low liquidity can cause your fill to be worse than your stop price — a phenomenon called slippage. For this reason, place your stop slightly beyond the technically significant level (e.g., $0.10 below support rather than exactly at support) and consider rounding down your position size by 5-10% to account for potential slippage. The calculator assumes exact fills, so add your own buffer for real-world conditions.
Use Stop Losses in Combination with Position Sizing
A stop loss alone is not sufficient for proper risk management. It must be combined with position sizing to ensure your total risk per trade stays within your risk budget. A tight stop allows a larger position; a wide stop requires a smaller position. Use the position size calculator in conjunction with this stop loss calculator to ensure that your per-share risk, position size, and total risk are all aligned with your risk management plan.
Frequently Asked Questions
What is a stop loss in trading?
A stop loss is a pre-placed order that automatically exits a trade when the price reaches a specified level. It is the most fundamental risk management tool in trading because it defines the maximum loss you will accept on a trade before it is even entered. Without a stop loss, you are relying on discipline and emotional control to exit a losing trade — a strategy that fails for most people under the pressure of real money. A stop loss removes the emotional decision from the equation by automating the exit.
How do I calculate my stop loss price?
The stop loss price is calculated based on where your trade thesis is invalidated. For a long position, place your stop below a support level, below a recent swing low, or below a technical indicator like a moving average. For a short position, place it above a resistance level or above a recent swing high. The dollar amount of risk is then: Entry Price minus Stop Loss Price. Use the calculator above to determine the exact stop loss price based on your entry, risk amount, and position size.
What is the difference between a fixed stop loss and a percentage stop loss?
A fixed stop loss is placed at a specific price level regardless of the stock price — for example, $2 below your entry. A percentage stop loss is placed at a fixed percentage below your entry — for example, 5% below your entry price. Fixed stops are better for traders who use technical levels to determine stops. Percentage stops are simpler and work well for shorter-term traders who want a consistent risk percentage. Neither is universally superior — the best approach depends on your trading style and the market conditions.
Should I use a tight or wide stop loss?
The width of your stop loss should be determined by the market, not by your preference. A stop that is too tight will be hit by normal market noise, stopping you out of trades that would have been profitable. A stop that is too wide allows excessive loss before exiting. The ideal stop is placed just beyond a technically significant level — below support for longs, above resistance for shorts — where a break of that level would invalidate your trade thesis. The width that results is the correct width for that trade.
What is a trailing stop loss?
A trailing stop loss is a stop that moves in the direction of your trade as the price moves in your favor. For a long position, the trailing stop rises as the stock price rises, locking in profits along the way. If the stock eventually reverses, the trailing stop catches the top and exits you with accumulated gains. Trailing stops can be based on a fixed percentage, a fixed dollar amount, or a technical indicator like the ATR. They allow you to capture larger trends while still protecting against reversals.
Can I get stopped out and then have the trade work?
Yes, this happens frequently and is one of the most frustrating experiences in trading. The price hits your stop, you exit with a loss, and then the price reverses and moves in your original direction. This is not a sign that your stop was wrong — it is a normal part of trading. The purpose of a stop loss is not to predict the exact bottom; it is to limit your risk to a predetermined amount. Accept that some stopped-out trades would have been winners, and focus on whether your stop placement produces positive expectancy over hundreds of trades.
How does stop loss relate to position sizing?
Stop loss and position sizing are two halves of the same risk management equation. Position sizing determines how much you risk per trade (e.g., 2% of your account), and the stop loss determines where you exit if the trade fails. Together, they determine how many shares or lots you can trade: Position Size = Risk Amount / (Entry Price − Stop Loss Price). A wider stop means a smaller position (for the same risk amount), and a tighter stop means a larger position. The two tools must be used together to achieve consistent risk management.
What is a guaranteed stop loss?
A guaranteed stop loss is a stop loss order that the broker guarantees will be filled at exactly the specified price, regardless of market conditions — including gaps, flash crashes, or extreme volatility. In exchange for this guarantee, brokers charge a premium (often built into the spread or as a separate fee). Guaranteed stop losses are most common in forex and CFD trading. They eliminate slippage risk entirely but at a cost. For most traders, placing stops at technically meaningful levels and accepting occasional slippage is more cost-effective than paying for the guarantee.
Should I move my stop loss after entering a trade?
You should only move your stop loss in one direction: in the direction of your trade (locking in profits). Never move your stop loss further away from your entry to avoid being stopped out — this is known as widening your stop and is one of the most destructive habits in trading. Moving your stop further away increases your risk beyond what you originally planned and typically leads to much larger losses than intended. If you feel the need to widen your stop, the original position size was likely too large.
What is the ATR-based stop loss method?
The ATR (Average True Range) stop loss method uses the ATR indicator to determine stop loss distance. ATR measures the average price range of an asset over a specified period, typically 14 periods. The ATR-based stop is placed at a multiple of the ATR below your entry (for longs) or above your entry (for shorts). For example, with an ATR of $2 and a 2x multiplier, your stop would be $4 from entry. This method adapts to volatility — wider stops in volatile markets, tighter stops in calm markets — making it one of the most robust stop loss methods available.