Calculate optimal position size based on risk management rules. 100% client-side.
Position Size
200.00units
Pro tip: Most professional traders risk 1-2% per trade. This ensures that even a streak of 10 consecutive losses only draws down the account by roughly 10-18%, which is recoverable.
For educational purposes only. Not financial advice. Always verify position sizes with your broker before placing orders.
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Calculate your first position size in 30 seconds
Type your total trading account balance in USD. This is the total capital you have available for trading, not the amount you want to risk on a single trade. Supports any account size from small retail accounts to institutional portfolios.
Choose the percentage of your account you are willing to risk on this trade. Professional traders typically risk 0.5-2% per trade. The risk meter will show whether your chosen level is conservative, moderate, aggressive, or dangerous.
Input your planned entry price and stop loss price. For long positions, stop loss is below entry. For short positions, stop loss is above entry. Toggle between long and short to match your trade direction.
See your calculated position size in units, dollar risk amount, stop loss distance in points and percentage. Use the risk meter gauge to visually assess whether your risk level is appropriate for your trading strategy.
The most important risk management skill in trading
Position sizing is the process of determining how many units of a security to buy or sell based on your account size, risk tolerance, and the distance to your stop loss. It is widely considered the single most important factor in long-term trading success, more important than entry signals, technical analysis patterns, or market timing.
The position size formula is straightforward:
Position Size = (Account Balance x Risk %) / |Entry Price - Stop Loss Price|
For example, with a $50,000 account risking 2% per trade, and a stock entry at $100 with a stop loss at $95, the calculation is: ($50,000 x 0.02) / |$100 - $95| = $1,000 / $5 = 200 shares.
Capital preservation: Without proper position sizing, a single losing trade can devastate your account. Professional traders know that preserving capital is the first rule of trading. A 50% loss requires a 100% gain just to break even. Keeping losses small through proper position sizing ensures you survive long enough for your edge to play out.
Consistency: Position sizing creates consistency across trades regardless of the asset or timeframe. Whether you are trading a $10 stock with a $0.50 stop or a $500 stock with a $25 stop, risking the same percentage means every trade has the same impact on your account. This removes emotional bias from sizing decisions.
Compounding: Proper position sizing enables compounding. When you risk a fixed percentage of your growing account, position sizes naturally increase as your account grows and decrease after drawdowns. This geometric scaling is how small accounts grow into large ones over time.
Drawdown management: A trader risking 1% per trade can endure 10 consecutive losses and only be down about 9.6%. A trader risking 5% per trade would be down 40% after the same losing streak. The difference between surviving a drawdown and blowing up an account often comes down to position sizing discipline.
Stocks: Position size is measured in shares. Entry and stop loss are share prices. Dollar risk = shares x price distance to stop.
Forex: Position size is measured in lots (standard = 100,000 units, mini = 10,000, micro = 1,000). Pip value varies by currency pair and lot size.
Futures: Position size is measured in contracts. Each point of movement has a fixed dollar value that varies by contract (e.g., $50/point for ES, $5/point for NQ micro).
Crypto: Position size is measured in coins or tokens. High volatility makes position sizing especially critical. Many traders use smaller risk percentages (0.5-1%) due to the outsized moves common in crypto markets.
Position sizing is one component of a complete risk management framework that includes: per-trade risk limits, daily loss limits, maximum open exposure, correlated position management, and portfolio-level risk budgets. This calculator addresses the foundational per-trade risk calculation that forms the basis of all higher-level risk management.
Position sizing across different markets
Calculate lot sizes for forex pairs based on pip distance to stop loss. Convert between standard, mini, and micro lots. Essential for managing risk across different currency pairs with varying pip values.
Determine share count for multi-day stock trades where stop loss is based on support levels, moving averages, or ATR multiples. Ensures consistent risk per trade regardless of stock price or volatility.
Size cryptocurrency positions accounting for high volatility. Typically uses smaller risk percentages than traditional markets. Works for spot trading, margin trading, and futures with leverage adjustments.
Calculate contract quantities for futures trading where each tick or point has a fixed dollar value. Critical for high-frequency trading where tight stops and precise sizing determine profitability.
Determine the equivalent underlying position size when trading options. Use the calculated size to determine option contracts and appropriate strike selection based on delta exposure.
Allocate risk across multiple simultaneous positions within a portfolio. Ensures total portfolio risk stays within acceptable bounds even when holding correlated positions across different assets.
Step-by-step instructions for this calculator
This calculator determines the optimal number of units (shares, lots, coins, or contracts) to trade based on your risk parameters. All calculations happen instantly as you type.
Account Balance: Enter your total available trading capital. This should be your entire account balance, not just available margin. The calculator uses this to compute your dollar risk based on the percentage you choose. Update this regularly as your account grows or shrinks.
Risk Percentage: Choose how much of your account to risk on a single trade. Guidelines by experience level:
Entry Price: The price at which you plan to enter the trade. For limit orders, this is your limit price. For market orders, use the current ask (buying) or bid (selling).
Stop Loss Price: The price at which you will exit if the trade moves against you. This should be determined by technical analysis (support/resistance, moving averages, ATR) before calculating position size.
Long positions: You buy the asset expecting it to increase in value. Entry price is below your target, and stop loss is below your entry. The stop loss distance is calculated as Entry - Stop Loss.
Short positions: You sell the asset expecting it to decrease in value. Entry price is above your target, and stop loss is above your entry. The stop loss distance is calculated as Stop Loss - Entry.
Position Size (units): The number of shares, lots, or coins to trade. This is the primary output. Round down to the nearest whole share or applicable lot size for your broker.
Dollar Risk Amount: The maximum amount you will lose if your stop loss is hit. This equals Account Balance multiplied by Risk Percentage.
Stop Loss Distance: Shown in both absolute points and as a percentage of the entry price. Wider stops mean smaller position sizes for the same dollar risk.
The visual risk gauge provides instant feedback on your chosen risk level. Green indicates conservative risk (under 1%), amber indicates moderate risk (1-2%), orange indicates aggressive risk (2-5%), and red indicates dangerous risk (over 5%). Most professional traders operate in the green to amber zone.
Everything you need to know about position sizing
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Safe for calculating position sizes for any trading account, strategy, or market. Your financial data never leaves your device.
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