Free calculator
Position size calculator
The number of shares that keeps a stop-out to the part of your account you chose to risk.
Nothing you type leaves this page. The sums run in your browser: no sign-up, no cookies, nothing saved or sent.
- Shares
- Money at risk
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- Position value
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- Share of the account
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How it works
The formula.
Money you can lose = account size × risk %. Risk per share = the distance from the entry to the stop. Shares = money you can lose ÷ risk per share, rounded down to a whole share, and money at risk = shares × risk per share. Example: an account of 10,000 risking 1% can lose 100; with the entry at 50 and the stop at 48 each share risks 2, so 50 shares. The stop limits the loss only when it fills at its price: a gap can fill it lower, and fees come on top.
A calculator works out one trade or one list. Stocka’s trade journal keeps the real numbers for you: every buy and sell with its fees, your average cost, and your realised and unrealised P&L, on iPhone, iPad and Mac. The journal is free.