Position Size Calculator
Calculate the optimal position size for your trades with our free Position Size Calculator. Supports stocks, forex, and futures. Enter your account balance, risk percentage, stop-loss, and pip value to get the exact number of shares, lots, or units to trade.
What Is Position Sizing?
Position sizing is the process of determining how many shares, lots, or contracts to trade based on your account size, risk tolerance, and the distance to your stop-loss. Proper position sizing is one of the most important aspects of risk management in trading.
This calculator uses the following core formula:
Core Formula:
Position Size = Risk Amount / (Stop Loss Distance × Pip Value per Unit)
Where:
Risk Amount = Account Balance × Risk Percentage
Stop Loss Distance = Entry Price − Stop Loss Price (for long positions)
Pip Value per Unit = Value of 1 pip for 1 unit of the instrument
How Does the Position Size Calculator Work?
The calculator supports three asset types:
- Stocks / Shares: Calculates the number of shares to buy. Uses the price difference between entry and stop-loss to determine risk per share.
- Forex (Lots): Calculates the number of lots to trade. Uses pip value and stop-loss in pips to determine lot size.
- Futures (Contracts): Calculates the number of contracts. Uses contract size and tick value to determine position size.
Simply enter your account balance, risk percentage, entry price, stop-loss, and the calculator will instantly tell you the optimal position size to stay within your risk parameters.
Why Use This Position Size Calculator?
- Risk Management: Never risk more than you're comfortable with on any single trade.
- Multi-Asset Support: Works for stocks, forex, and futures.
- Advanced Options: Add commission, slippage, and precision settings.
- Visual Breakdown: See how your risk and position size are calculated.
- Free & Private: No registration, no data storage.
The Importance of Position Sizing
- The 1-2% Rule: Most professional traders risk no more than 1-2% of their account on any single trade. This ensures that a string of losses won't wipe out your account.
- Consistency: Proper position sizing helps you stay consistent and avoid emotional trading decisions.
- Survival: The primary goal of position sizing is to ensure you survive long enough to let your edge play out.
❓ Position Size Calculator FAQ
What is position sizing?
Position sizing is the process of determining how many shares, lots, or contracts to trade based on your account size, risk tolerance, and stop-loss distance. It's a critical component of risk management.
How is position size calculated?
Position size is calculated by dividing your risk amount (account balance × risk percentage) by the stop-loss distance multiplied by the pip or tick value per unit.
What is the 1-2% rule in trading?
The 1-2% rule states that you should risk no more than 1-2% of your trading account on any single trade. This helps protect your account from significant drawdowns.
How do I calculate position size for stocks?
For stocks: Position Size = Risk Amount / (Entry Price − Stop Loss Price). For example, with a $10,000 account, 2% risk ($200), entry at $100, and stop-loss at $95, you would buy 40 shares ($200 / $5).
How do I calculate position size for forex?
For forex: Position Size (lots) = Risk Amount / (Stop Loss in Pips × Pip Value per Lot). For example, with a $10,000 account, 2% risk ($200), 50-pip stop-loss, and $10 pip value, you would trade 0.4 lots.
What is a pip?
A pip is the smallest price movement in forex trading, typically the fourth decimal place (0.0001) for most currency pairs. For JPY pairs, it's the second decimal place (0.01).
What is the difference between a lot and a share?
A lot is a standard unit size in forex trading (100,000 units for a standard lot). A share is a single unit of stock ownership. This calculator supports both.
How does stop-loss affect position size?
A wider stop-loss distance reduces the position size for the same risk amount. A tighter stop-loss allows for a larger position size. This calculator helps you find the right balance.
What is slippage?
Slippage is the difference between the expected price of a trade and the actual price at which it's executed. This calculator lets you account for slippage in your risk calculations.
Why is position sizing important?
Position sizing is important because it protects your account from large losses. By risking only a small percentage of your account per trade, you can survive losing streaks and continue trading.
Can I use this calculator for crypto trading?
Yes, you can use this calculator for crypto trading by selecting "Stocks / Shares" and entering the crypto price as the entry and stop-loss prices. The result will be the number of units to trade.
How do I calculate position size for futures?
For futures: Position Size (contracts) = Risk Amount / (Stop Loss Distance × Contract Size × Tick Value). Enter the contract size and the calculator will compute the number of contracts.