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The results from this calculator are for informational and educational purposes only. They are not a guarantee of actual outcomes and should not be considered financial, investment, tax, or legal advice. Always consult a qualified professional for advice tailored to your specific financial situation. See our Terms of Service and Privacy Policy for more information.
The Position Sizing Calculator helps traders and investors determine exactly how many shares or units to purchase based on their specific risk tolerance and account size. It is a critical tool for risk management, ensuring that a single bad trade does not significantly deplete your overall portfolio capital.
A position sizing calculator helps investors determine the appropriate amount of capital to allocate to a single trade based on account size, risk tolerance, and stop-loss distance, aiming to manage portfolio risk effectively.
Position sizing calculators use account equity, risk percentage, and stop-loss distance to compute the number of shares or contracts to trade.
Proper position sizing is a core component of risk management, helping to limit losses on any single trade to a predefined percentage of total capital.
These calculators can be applied to stocks, options, futures, and forex to standardize risk across different asset classes.
Using a position sizing calculator helps traders avoid emotional decision-making and maintain consistency in their trading approach.
Position Size = (Account Balance * Risk Percentage per Trade) / (Entry Price - Stop Loss Price)
This formula calculates the total dollar amount you are willing to risk on a single trade and divides it by the price difference between your entry point and your stop-loss order to determine the number of shares to buy.
Imagine you have a $50,000 trading account and you follow a strict rule to never risk more than 1% of your total capital on any single trade. Before entering a position in a volatile tech stock, you use this calculator to input your account balance, your 1% risk threshold, and your planned stop-loss level. The calculator instantly tells you how many shares you can buy so that if your stop-loss is triggered, you lose exactly $500 and not a penny more. This prevents emotional decision-making and protects your long-term financial health during market downturns.
If you have a $10,000 account and want to risk 2% per trade, your total risk is $200. With an entry price of $50 and a stop-loss at $45, the calculator determines you should purchase exactly 40 shares to maintain your risk parameters.
These authoritative sources inform our calculator methodology and ensure accuracy.
Written by Qasem Mohammed
Financial tools developer and founder of QFINHUB. All calculators are built with industry-standard formulas and reviewed for accuracy. Content is for educational purposes only — always consult a qualified financial professional for decisions about your specific situation.
Last updated: June 25, 2026 ·About QFINHUB · Editorial Policy
Last reviewed by Qasem Mohammed — June 25, 2026
AI & Software Engineer, Founder & Lead Developer at QFINHUB · Editorial Policy
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Shares to Buy
200
At $100.00 per share
$ Risked
$1,000.00
2% of $50,000
Position Value
$20,000.00